Document:

<PAGE>   1

                                                                    EXHIBIT 10.1

                           LOAN AND SECURITY AGREEMENT

                                       BY

                                       AND

                                      AMONG

                      THE CIT GROUP/BUSINESS CREDIT, INC.,

                              AS AGENT AND LENDER,

                           GMAC BUSINESS CREDIT, LLC,

                        AS SYNDICATION AGENT AND LENDER,

                          FOOTHILL CAPITAL CORPORATION,

                       AS DOCUMENTATION AGENT AND LENDER,

          UTI ENERGY CORP., UTICO, INC., UTICO HARD ROCK BORING, INC.,
                 INTERNATIONAL PETROLEUM SERVICE COMPANY, NORTON
       DRILLING SERVICES, INC., AND NORTON DRILLING COMPANY MEXICO, INC.,

                                AS THE GUARANTORS

                                       AND

                  UTI DRILLING, L.P., NORTON DRILLING COMPANY,
          UNIVERSAL WELL SERVICES, INC., UTI MANAGEMENT SERVICES, L.P.
                           AND SUITS DRILLING COMPANY,

                        AS THE COMPANIES (AND BORROWERS)

                         DATED AS OF: NOVEMBER 22, 1999

                                               UTI - LOAN AND SECURITY AGREEMENT

<PAGE>   2

                                TABLE OF CONTENTS

<Table>
<Caption>

                                                                                                               PAGE
                                                                                                               ----

<S>                                                                                                              <C>
SECTION 1.        Definitions.....................................................................................1

SECTION 2.        Conditions Precedent...........................................................................27

SECTION 3.        Revolving Loans................................................................................30

SECTION 4.        Acquisition Facility Loans and Permitted Acquisitions..........................................34

SECTION 5.        Letters of Credit..............................................................................38

SECTION 6.        Collateral.....................................................................................41

SECTION 7.        Representations, Warranties and Covenants......................................................45

SECTION 8.        Interest, Fees and Expenses....................................................................66

SECTION 9.        Powers.........................................................................................68

SECTION 10.       Events of Default and Remedies.................................................................69

SECTION 11.       Termination....................................................................................73

SECTION 12.       Miscellaneous..................................................................................74

SECTION 13.       Agreement Between the Lenders..................................................................80

SECTION 14.       Lenders........................................................................................83
</Table>

                                               UTI - LOAN AND SECURITY AGREEMENT

                                      (i)

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EXHIBITS

Exhibit A - Form of Revolving Loan Promissory Note
Exhibit B - Form of Assignment and Transfer Agreement
Exhibit C - Form of Borrowing Notice

SCHEDULES

Schedule 1 - Existing Liens
Schedule 7(1) - Collateral Locations and Chief Executive Office
Schedule 7(8)(b)(ii) - Rig Operations Report
Schedule 7(8)(b)(iii) - Receivables Aging Report
Schedule 7(10)(H)(iv) - Investments
Schedule 7(18)(d) - Other Lending Agreements
Schedule 7(18)(e)(i) - Real Property Owned or Leased
Schedule 7(18)(e)(iv) - Rigs and Other Equipment
Schedule 7(18)(f) - Litigation
Schedule 7(18)(k) - Environmental Matters
Schedule 7(18)(m) - Subsidiaries; Capital Stock
Schedule 7(18)(n) - Insurance Policies
Schedule 7(18)(o) - Indebtedness

                                               UTI - LOAN AND SECURITY AGREEMENT

                                      (ii)

<PAGE>   4

                           LOAN AND SECURITY AGREEMENT

         THE CIT GROUP/BUSINESS CREDIT, INC., a New York corporation
(hereinafter "CITBC") with offices located at 1211 Avenue of the Americas, New
York, New York 10036, Foothill Capital Corporation, a California corporation
("FCC"), GMAC Business Credit, LLC, a Michigan limited liability company
("GMAC"), and any other party hereafter becoming a Lender hereunder pursuant to
Section 13, Paragraph 9 hereof each individually sometimes referred to as a
"LENDER" and collectively the "LENDERS"), CITBC as Agent for the Lenders
(hereinafter the "AGENT"), are pleased to confirm the terms and conditions under
which the Lenders acting through the Agent shall make revolving loans and other
financial accommodations to UTI Drilling, L.P., a Texas limited partnership
("UTI"), Norton Drilling Company, a Delaware corporation ("NDC"), Universal Well
Services, Inc., a Delaware corporation ("UWSI"), UTI Management Services, L.P.,
a Texas limited partnership ("UTIMS"), and Suits Drilling Company, an Oklahoma
corporation ("SDC"), (UTI, NDC, SDC, UWS and UTIMS, together with any additional
entities which may become a Company hereunder from time to time, are referred to
herein individually, as a "COMPANY", and collectively, as the "COMPANIES"), each
with its principal place of business and chief executive office at 16800
Greenspoint Park, Suite 225N, Houston, Texas 77060, supported by the guaranties
of UTI Energy Corp., a Delaware corporation (the "PARENT"), UTICO, Inc., a
Delaware corporation ("HOLDING"), UTICO Hard Rock Boring, Inc., a Delaware
corporation ("UHRB"), International Petroleum Service Company, a Pennsylvania
corporation ("IPSCO"), Norton Drilling Services, Inc., a Delaware corporation
("NDS"), and Norton Drilling Company Mexico, Inc., a Delaware corporation
("NDM") (Parent, Holding, UHRB, IPSCO, NDS and NDM are referred to herein,
individually, as a "GUARANTOR", and collectively, as the "GUARANTORS"), with
Parent's and each of UWSI's, UHRB's, IPSCO's, UTIMS's, NDS's and NDM's principal
place of business and chief executive office at 16800 Greenspoint Park, Suite
225N, Houston, Texas 77060, and Holding's principal place of business and chief
executive office at 801 West Street, Wilmington, Delaware 19801-1545.

SECTION 1. DEFINITIONS

         "ACCOUNTS" shall mean all of each Company's now existing and future:
(a) accounts (as defined in the U.C.C.) and any and all other receivables
(whether or not specifically listed on schedules furnished to the Agent),
including, without limitation, all accounts created by or arising from all of
each Company's sales of goods or rendition of services to its customers, and all
accounts arising from sales or rendition of services made under any of such
Company's trade names or styles, or through any of such Company's divisions; (b)
any and all instruments (as defined in the U.C.C.), documents (as defined in the
U.C.C.) and chattel paper (as defined in the U.C.C.); (c) unpaid seller's rights
(including rescission, replevin, reclamation and stoppage in transit) relating
to the foregoing or arising therefrom; (d) rights to any goods represented by
any of the foregoing, including rights to returned or repossessed goods; (e)
reserves and credit balances arising hereunder; (f) guarantees or collateral for
any of the foregoing; (g) insurance policies or rights relating to any of the
foregoing; (h) contract rights; and (i) cash and non-cash proceeds of any and
all the foregoing.

         "ACCOUNTS RECEIVABLE ADVANCE PERCENTAGE" shall mean eighty percent
(80%).

                                               UTI - LOAN AND SECURITY AGREEMENT

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         "ACQUISITION" shall mean the purchase, lease (whether a capital lease,
an operating lease or otherwise) or other acquisition of any or all of the
following: (a) Rigs; (b) Rigs Accessories (other than (i) maintenance and
replacement components and parts (including installation) for existing Rigs and
Rigs acquired hereafter, and (ii) drill pipe for Rigs, in each case acquired in
the ordinary course of business or (iii) the purchase of tangible assets
pursuant to the reinvestment of casualty insurance proceeds); (c) more than 50%
of the voting common stock or capital stock of any Person; and (d) all or
substantially all of the assets of any Person.

         "ACQUISITION AGREEMENTS" shall have the meaning assigned to such term
in Section 4 hereof.

         "ACQUISITION FACILITY COMMITMENT" shall mean, with respect to any
Lender, a portion of the Revolving Loans which may be advanced as Acquisition
Facility Loans, evidencing the amount of its commitment to make Acquisition
Facility Loans (all such loans being Revolving Loans), as modified from time to
time pursuant to the terms hereof, not to exceed $45,000,000 in the aggregate.

         "ACQUISITION FACILITY LOANS" shall have the meaning assigned to such
term in Section 4 hereof.

         "ADMINISTRATIVE MANAGEMENT FEE" shall mean the sum of $25,000 per annum
which shall be paid to the Agent for its own account in accordance with Section
8, Paragraph 8 hereof to offset the expenses and costs (excluding Out-of-Pocket
Expenses) of the Agent in connection with record keeping, periodic examinations,
analyzing and evaluating the Collateral.

         "AGREEMENT" shall mean this Loan and Security Agreement (as the same
may be amended, modified or changed from time to time).

         "AGENT COMMITMENT LETTER" shall mean the commitment letter dated
October 6, 1999, issued by the Agent to, and accepted by, each Company (as the
same may be amended, modified or changed from time to time).

         "ANNIVERSARY DATE" shall mean the date occurring four (4) years from
the date hereof and the same date in every year thereafter.

         "APPLICABLE MARGIN" means, with respect to any amount outstanding made
under any LIBOR Loans or Revolving Loans other than LIBOR Loans, as the case may
be, the rate of interest per annum determined as set forth below:

                  (a) during the period from the Closing Date through the
Financial Statement Delivery Date (as defined below) for the fiscal quarter
ending on December 31, 1999:

                                               UTI - LOAN AND SECURITY AGREEMENT

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<PAGE>   6

<Table>
<Caption>

            AS TO REVOLVING LOANS                AS TO
           OTHER THAN LIBOR LOANS             LIBOR LOANS
           ----------------------             -----------
<S>                                           <C>
                  0.25%                          2.25%
</Table>

                  (b) during the period between any two Financial Statement
Delivery Dates for any Margin Period occurring after December 31, 1999, the rate
determined by reference to the pricing grid below as a function of the amount of
TTM EBITDA:

<Table>
<Caption>

                                                            AS TO REVOLVING LOANS                AS TO
                     TTM EBITDA                           OTHER THAN LIBOR LOANS              LIBOR LOANS
                     ----------                           ----------------------              -----------
<S>                                                       <C>                                 <C>
                 > or = to $27,500,000                              0.00%                         1.75%

       > $27,500,000 and > or = to $22,500,000                      0.00%                         2.00%

       < $22,500,000 and > or = to $17,500,000                      0.25%                         2.25%

       < $17,500,000 and > or = to $15,000,000                      0.50%                         2.50%

                    < $15,000,000                                   0.75%                         2.75%
</Table>

As used herein, "FINANCIAL STATEMENT DELIVERY DATE" means the earlier of (i) the
last day on which the quarterly or annual financial statements of the Companies
are to be delivered to the Agent and the Lenders pursuant to Section 7,
Paragraph 8(a), or (ii) the date upon which such financial statements actually
are delivered to the Agent and the Lenders. As used herein, "MARGIN PERIOD"
means a period commencing on the most recent Financial Statement Delivery Date
and ending on the next Financial Statement Delivery Date. Each change in the
Applicable Margin shall become effective on the first day of the calendar month
next following the applicable Financial Statement Delivery Date.

         "APPLICATION FOR LETTER OF CREDIT" shall mean an application for the
issuance of a Letter of Credit as prescribed by the bank or financial
institution issuing the same.

         "APPRAISAL OF ORDERLY LIQUIDATION VALUE" shall mean a formal written
appraisal by an Approved Appraiser establishing Orderly Liquidation Value of an
asset or property as set forth in a report by such Approved Appraiser delivered
to the Agent, which appraisal and report shall be in form and substance
acceptable to the Agent.

         "APPROVED APPRAISER" shall mean M.E.L. Valuations, Inc. or any other
appraiser acceptable to the Agent.

         "AVAILABILITY" shall mean, with respect to the Companies taken as a
whole, at any time the excess of (a) the lesser of (i) the Line of Credit or
(ii) the sum of (A) Eligible Accounts Receivable of such Companies multiplied by
the Accounts Receivable Advance Percentage, and (B) the lesser of (I) Net Book
Value multiplied by the Equipment Advance Percentage or (II) the aggregate value
of Eligible Equipment of the Companies multiplied by the Equipment Advance
Percentage, over (b) the sum of (i) the outstanding aggregate amount of all
Obligations, including, without limitation, all

                                               UTI - LOAN AND SECURITY AGREEMENT

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<PAGE>   7

Obligations with respect to Revolving Loans and outstanding undrawn balance of
Letters of Credit outstanding and (ii) the Availability Reserve.

         "AVAILABILITY RESERVE" shall mean, with respect to the Companies, the
sum of (a) three (3) months rental payments on all leased premises (where Rigs
are stored from time to time) of the Companies for which the Companies have not
delivered to the Agent a landlord's waiver (in form and substance satisfactory
to Agent in the exercise of its reasonable business judgment), provided that
such amount shall be adjusted from time to time hereafter upon (i) delivery to
the Agent of any such acceptable waiver, (ii) the opening or closing of a
Collateral storage location and/or (iii) any change in rental payment and/or
storage charge, and (b) an amount equal to any and all past due storage charges
with respect to all warehouse locations at which Collateral may be located,
provided that the Companies shall promptly advise the Agent of all such amounts
and, upon request by the Agent, provide a report to the Agent with respect
thereto, and (c) such other reserves as the Agent reasonably determines are
appropriate under the circumstances, including, without limitation, reserves for
liens on Accounts or Equipment.

         "AVERAGE LIFE" means, as of the date of determination, with reference
to any Indebtedness For Borrowed Money, the quotient obtained by dividing (a)
the sum of the products of the number of years from the date of determination to
the dates of each successive scheduled principal payment of such Indebtedness
For Borrowed Money multiplied by the amount of such principal payment by (b) the
sum of all such principal payments.

         "ASSIGNMENT AND TRANSFER AGREEMENT" shall mean the Assignment and
Transfer Agreement in the form of Exhibit B hereto.

         "BOARD" means the Board of Governors of the Federal Reserve System of
the United States (or any successor) and any other banking authority to which
the Lenders are subject for Eurocurrency Liabilities (within the meaning of
Regulation D of the Board as in effect from time to time) or any other category
of deposits or liabilities by reference to which the LIBOR Loan rate of interest
is determined.

         "BUSINESS DAY" shall mean any day that the Agent is open for business
in New York, New York, which is not (a) a Saturday, Sunday or legal holiday in
the State of New York or (b) a day on which banking institution chartered by the
State of New York or the United States are legally required to close.

         "CANADIAN ACQUISITION" means the Acquisition of a Person or business
unit whose principal place of business is in Canada, or an Acquisition of assets
by a Subsidiary, formed under Canadian law, of an Obligor.

         "CANADIAN EXCHANGEABLE SHARES" means shares of Capital Stock of a
Canadian Operating Company issued to a Person in connection with a Permitted
Acquisition by such Canadian Operating Company, which Person is not an Obligor
or Subsidiary of an Obligor, and which shares of Capital Stock are (i) not
entitled to vote generally in the election of directors of such Canadian
Operating Company, (ii) are convertible at the option of the holder into shares
of common stock of the Parent

                                               UTI - LOAN AND SECURITY AGREEMENT

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<PAGE>   8

and (iii) are subordinated (with respect to dividends and preference in
liquidation) to the Capital Stock of the Canadian Operating Company which is
pledged to the Agent.

         "CANADIAN FINANCE COMPANY" shall mean a direct, wholly-owned Subsidiary
of an Obligor, which Subsidiary is organized under Canadian Law, with a limited
purpose of acquiring loans of, and/or making loans to a Canadian Operating
Company (which loans are secured by a Canadian First Priority Lien) and other
ministerial and incidental powers reasonably necessary or incident thereto, and
66% of the Capital Stock of which is pledged to the Agent.

         "CANADIAN FIRST PRIORITY LIEN" means a perfected, first priority lien
on all of the assets of a Canadian Operating Company or Canadian Finance Company
(other than automobiles, Real Estate and Intellectual Property), subject only to
(a) Permitted Liens, (b) prior liens of a Canadian Finance Company, (c) liens in
favor of an affiliate of the Agent and (d) any other lien which Agent, in its
sole discretion, approves in writing.

         "CANADIAN OPERATING COMPANY" shall mean a direct, wholly-owned
Subsidiary of an Obligor (except to the extent of Canadian Exchangeable Shares),
which is organized under Canadian law, and 66% of the Capital Stock of which is
pledged to the Agent, provided that notwithstanding the foregoing, no Canadian
Exchangeable Shares of such Canadian Operating Company will be pledged to the
Agent.

         "CAPITAL EXPENDITURES" for any period shall mean the aggregate of all
expenditures of each Company during such period that in conformity with GAAP are
required to be included in or reflected by the property, plant or equipment or
similar fixed asset account reflected in the consolidated balance sheet of such
Company.

         "CAPITAL LEASE" shall mean any lease of property (whether real,
personal or mixed) which, in conformity with GAAP, is accounted for as a capital
lease or a Capital Expenditure on the balance sheet of each Company.

         "CAPITAL STOCK" means, with respect to any Person, any and all shares,
interests, rights to purchase, warrants, options, participations or other
equivalents (however designated) of such Person's equity, including all common
stock and preferred stock, any limited or general partnership interest and any
limited liability company membership.

         "CHASE BANK RATE" shall mean the rate of interest per annum announced
by The Chase Manhattan Bank, N.A. from time to time as its prime rate in effect
at its principal office in the City of New York. (The prime rate is not intended
to be the lowest rate of interest charged by The Chase Manhattan Bank, N.A. to
its borrowers).

         "CLOSING DATE" shall mean November 22, 1999.

         "COLLATERAL" shall mean, with respect to all Obligors, all present and
future Accounts, Equipment, Inventory, Documents of Title, General Intangibles
(other than Intellectual Property except as set forth below) and Other
Collateral, whether now existing or hereafter arising, and cash

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       5
<PAGE>   9

and non-cash proceeds thereof; and, following the occurrence of an Event of
Default, and so long as the same is continuing, Collateral shall also include in
addition to the foregoing such Real Estate, automobiles owned by any Obligor and
Intellectual Property of such Obligors as Agent shall have requested or obtained
a lien or security interest as contemplated in Paragraph 8, Paragraph 9 and/or
Paragraph 10 of Section 6 of this Agreement, and cash and non-cash proceeds
thereof.

         "COLLECTIONS" shall have the meaning provided for in Section 3,
Paragraph 4 of this Agreement.

         "CONSOLIDATED BALANCE SHEET" shall mean a consolidated balance sheet
for the Parent and the consolidated Subsidiaries thereof eliminating all
inter-company transactions and prepared in accordance with GAAP.

         "CONSOLIDATING BALANCE SHEET" shall mean a Consolidated Balance Sheet
plus individual balance sheets for each Company, and the other Subsidiaries of
Parent, if any, each showing all eliminations of inter-company transactions and
prepared in accordance with GAAP.

         "CONTRACT RATE" shall mean the applicable rate of interest computed as
set forth in Section 8, Paragraph 1(a) of this Agreement.

         "CUSTOMARILY PERMITTED LIENS" shall mean:

                  (a) liens of local or state authorities (excluding federal tax
liens) for franchise or other like taxes (and interest and penalties thereon),
provided that the aggregate amounts of such taxes relating to such liens shall
not exceed $1,000,000 in the aggregate at any one time;

                  (b) statutory liens of landlords and liens of carriers,
warehousemen, mechanics, materialmen and other like liens imposed by law,
created in the ordinary course of business and for amounts not yet due (or which
are being contested in good faith by appropriate proceedings or other
appropriate actions which are sufficient to prevent imminent foreclosure of such
liens) and with respect to which adequate reserves or other appropriate
provisions are being maintained in accordance with GAAP;

                  (c) deposits made (and the liens thereon) in the ordinary
course of business (including, without limitation, security deposits for leases,
surety bonds and appeal bonds) in connection with workers' compensation,
unemployment insurance and other types of social security benefits or to secure
the performance of tenders, bids, contracts (other than for the repayment or
guarantee of borrowed money or purchase money obligations), statutory
obligations and other government contracts, not to exceed $1,000,000 in the
aggregate outstanding at any one time.

                  (d) easements (including, without limitation, reciprocal
easement agreements and utility agreements), encroachments, rights of way, minor
defects or irregularities in title, variation and other restrictions, charges or
encumbrances (whether or not recorded) affecting the Real Estate and which in
the aggregate do not materially interfere with the occupation, use or enjoyment
by each Company in its business of the property so encumbered;

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       6
<PAGE>   10

                  (e) liens for taxes not yet delinquent or which are being
contested in good faith by appropriate proceedings, provided that (i) adequate
reserves with respect thereto are maintained on the books of the applicable
Person in accordance with GAAP, and (ii) such liens secure liabilities not
exceeding $1,000,000;

                  (f) judgment and attachment liens not giving rise to an Event
of Default or liens created by or existing from any litigation or legal
proceeding that are being contested in good faith by appropriate proceedings,
promptly instituted and diligently conducted, and for which adequate reserves
have been made to the extent required by GAAP, provided that (i) such liens are
junior and inferior to those of the Agent, (ii) the judgment or attachment
amount does not exceed $1,000,000, and (iii) an Availability Reserve has been
established with respect thereto;

                  (g) liens created pursuant to this Agreement or any of the
Loan Documents executed in connection herewith in favor of the Agent;

                  (h) leases or subleases of Real Estate or Rigs granted to
others not interfering in any material respect with the business of the Parent
or any of the Obligors; provided that leases or subleases of Rigs shall be
subordinated to in writing (in form and substance reasonably satisfactory to the
Agent) to the liens arising under Loan Documents and otherwise permitted
hereunder; and

                  (i) liens in favor of collecting or payor banks having a right
of setoff, revocation, refund or chargeback in favor of collecting or payor
banks with respect to money or instruments of the Parent or any of its
Subsidiaries on deposit with or in possession of such bank.

         "DATED LIABILITIES" shall have the meaning assigned to such term in
Section 12, Paragraph 12 hereof.

         "DATED ASSETS" shall have the meaning assigned to such term in Section
12, Paragraph 12 hereof.

         "DEFAULT" shall mean any event specified in Section 10 hereof, which,
after the giving of notice, the lapse of time, or both, or any other condition,
event or act, has been satisfied, would constitute an Event of Default.

         "DEFAULT RATE OF INTEREST" shall mean a rate of interest per annum
equal to the lesser of (a) the Maximum Legal Rate or (b) the sum of (i) two
percent (2%) and (ii) the applicable contract rate of interest based upon the
applicable increment over the Chase Bank Rate as determined under Section 8
hereof, which the Agent on behalf of the Lenders shall be entitled to charge
each Company on all Obligations to the extent provided in Section 10, Paragraph
2(ii) of this Agreement.

         "DEPOSITORY ACCOUNTS" shall have the meaning specified in Section 3,
Paragraph 4 hereof.

         "DESIGNATED MERGER" shall mean the merger or consolidation on or before
December 31, 1999 of (a) NDS, IPSCO and Lobell Corporation (and no other
entities) in a transaction in which

                                               UTI - LOAN AND SECURITY AGREEMENT

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<PAGE>   11

NDS or IPSCO is the sole surviving entity, and (b) NDC with and into UTI (and no
other entities) in a transaction in which UTI is the sole surviving entity;
provided that in each case (i) there has not occurred and Event of Default that
is continuing which has not been waived in writing by the Agent and no Default
or Event of Default would occur or exist after giving effect thereto, and (ii)
no Person receives any consideration which would not be permitted to be paid to
such Person at such time as a Restricted Payment (and in such case such
consideration shall constitute a Restricted Payment for all purposes of this
Agreement).

         "DISQUALIFIED STOCK" means, any Capital Stock of an Obligor or any
Subsidiary thereof that, by its terms (or by the terms of any security into
which it is convertible or for which it is exercisable, redeemable or
exchangeable), or upon the happening of any event or with the passage of time,
matures, or is mandatorily redeemable, pursuant to a sinking fund obligation or
otherwise, or is redeemable at the option of the holder thereof, in whole or in
part, in each case on, or prior to, the Anniversary Date, or is convertible into
or is exchangeable for debt securities of the Obligor or any Subsidiary thereof,
except to the extent that such exchange or conversion rights cannot be exercised
prior to the Anniversary Date; provided, however, that solely for purposes of
determining which Capital Stock is Disqualified Stock, the Anniversary Date
shall mean the Maturity Date and each subsequent Anniversary Date that arises by
virtue of a renewal that actually occurs pursuant to Section 11 of this
Agreement; provided further, however, that Qualified Capital Stock, which
becomes Disqualified Capital Stock (whether or not in connection with the
failure of any party hereto to terminate this Agreement pursuant to Section 11),
shall not constitute Disqualified Capital Stock if the payment, conversion or
other rights in respect thereof are subordinated in writing (in form and
substance reasonably satisfactory to the Agent) to the full payment and
performance of all Obligations to the Lenders and the Agent under the Loan
Documents on or before the effective date of such recharacterization hereunder.
For the purpose of this Agreement the determination that Qualified Capital Stock
shall be treated as Disqualified Capital Stock shall only apply prospectively
(and not apply retroactively) from and after the date on which Qualified Capital
Stock actually becomes Disqualified Capital Stock under the foregoing
definition.

         "DOCUMENTATION FEE" shall mean the cost and expenses to compensate the
Agent for such use of inside counsel for completion of post-closing matters,
modifications, waivers, releases, amendments or additional collateral with
respect to the Loan Documents, the Collateral and/or the Obligations.

         "DOCUMENTS OF TITLE" shall mean all present and future documents (as
defined in the U.C.C.) including, without limitation, all warehouse receipts,
bills of lading, shipping documents, chattel paper, instruments and similar
documents, all whether negotiable or not and all goods and Equipment relating
thereto and all cash and non-cash proceeds of the foregoing.

         "DOMESTIC" shall mean (a) with respect to a Person, a Person formed
under the laws of the United States or any state thereof, and (b) with respect
to assets, that (i) such assets are located in the continental United States,
Alaska or Hawaii or (ii) an acquisition of such assets by a Subsidiary formed
under laws of a state of the United States of America.

                                               UTI - LOAN AND SECURITY AGREEMENT

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<PAGE>   12

         "DOMESTIC ACQUISITION" shall mean the acquisition of a Person or
business whose principal place of business and chief executive office is in the
United States of America.

         "DOMESTIC RIGS" shall mean Rigs owned by each Company which are located
in the 50 states of the United States of America.

         "EARLY TERMINATION DATE" shall mean the date on which the Companies
terminate this Agreement or the Line of Credit which date is prior to an
Anniversary Date.

         "EARLY TERMINATION FEE" shall: (a) mean the fee the Agent on behalf of
the Lenders is entitled to charge the Companies if the Companies terminate the
Line of Credit or this Agreement on a date prior to the fourth anniversary of
the Closing Date; and (b) be determined by multiplying the Line of Credit by (i)
seven-tenths of one percent (0.70%) if the Early Termination Date occurs on or
prior to one year (1) after the Closing Date, (ii) one-half of one percent
(0.50%) if the Early Termination Date occurs after one (1) year after the
Closing Date but on or prior to two (2) years after the Closing Date (iii)
three-tenths of one percent (0.30%) if the Early Termination Date occurs after
two (2) years after the Closing Date but on or prior to three (3) years after
the Closing Date; and (iv) two-tenths of one percent (0.20%) if the Early
Termination Date occurs after three (3) years but prior to four (4) years after
the Closing Date.

         "EBITDA" shall mean, in any period, all earnings before all (a)
interest and tax obligations, (b) depreciation and depletion and (c)
amortization for said period, all determined in accordance with GAAP on a basis
consistent with the latest audited financial statements of the Companies, the
Parent and their respective consolidated Subsidiaries but excluding the effect
of extraordinary and non-reoccurring gains or losses and non-cash compensation
expense for such period.

         "ELIGIBLE ACCOUNTS RECEIVABLE" shall mean, with respect to all
Companies, the gross amount of the Companies' Trade Accounts Receivable that are
subject to a valid, first priority and fully perfected lien and security
interest in favor of the Agent on behalf of the Lenders and which conform to the
warranties contained herein less, without duplication, the sum of (a) any
returns, discounts, claims, credits and allowances of any nature (whether
issued, owing, granted or outstanding); (b) reserves for: (i) sales to the
government of the United States of America or to any agency, department or
division thereof; (ii) foreign sales other than sales (x) secured by stand-by
letters of credit (in form and substance satisfactory to the Agent) issued or
confirmed by, and payable at, banks having a place of business in the United
States of America and payable in United States currency, or (y) to customers
residing in Canada, provided that such sales otherwise comply with all of the
other criteria for eligibility hereunder and are payable in United States or
Canadian currency; (iii) accounts that remain unpaid more than ninety (90) days
from invoice date; (iv) contra accounts with respect to accounts receivable; (v)
sales to Parent, any Subsidiary thereof, or to any company affiliated with
Parent or any Company in any way; (vi) bill and hold (deferred shipment) or
consignment sales; (vii) sales to any customer which is (w) insolvent, (x) a
debtor in any bankruptcy, insolvency, arrangement, reorganization, receivership
or similar proceedings under any federal or state law, (y) negotiating, or has
called a meeting of its creditors for purposes of negotiating, a compromise of
its debts or (z) financially unacceptable to the Agent or has a credit rating
unacceptable to the Agent in the exercise of its reasonable credit judgement;
(viii) all sales to any customer if fifty percent (50%) or more of

                                               UTI - LOAN AND SECURITY AGREEMENT

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<PAGE>   13

either (x) all outstanding invoices of such customer or (y) the aggregate dollar
amount of all outstanding invoices of such customer, are unpaid more than ninety
(90) days from invoice date; any other reasons deemed necessary by the Agent in
its reasonable business judgment and which are customary either in the
commercial finance industry; and (x) an amount representing probable returns,
discounts, claims, credits, offsets and allowances (including, but not limited
to, any of the foregoing attributable to Liens for the benefit of unpaid
subcontractors of any Company) and; (c) accounts due from an account debtor to
the extent that such accounts exceed, in the aggregate, thirty percent (30%) of
the aggregate of all accounts as of the date of determination. As used in this
definition, "sales" means the sale of goods or the charges for the performance
of services. Eligible Accounts Receivable do not include any Accounts for which
the Agent shall not have received monthly reports as the Agent shall require
pursuant to Section 3, Paragraph 2 (but in any event reports shall be required
to be provided pursuant to Section 7, Paragraph 8(b)(iii)(D) hereof).

         "ELIGIBLE ASSIGNEE" means (a) any Lender, (b) a commercial bank or
financial institution organized or licensed under the laws of the United States,
or a state thereof, and having total assets in excess of $500,000,000, or an
asset based lender affiliated therewith, (c) a commercial bank organized under
the laws of the OECD, or a political subdivision of any such country, and having
total assets in excess of $500,000,000; provided that such bank is acting
through a branch or agency located in the country in which it is organized, or
another country which is also a member of the OECD; and (d) any other bank or
financial institution approved by both the Agent and the Parent.

         "ELIGIBLE EQUIPMENT" shall mean, with respect to the Companies taken as
a whole, the Orderly Liquidation Value (with Orderly Liquidation Value being
based upon the then most recent Appraisal of Orderly Liquidation Value) of
Qualified Domestic Rigs owned by such Companies that are subject to a valid,
first priority and fully perfected lien and security interest in favor of the
Agent for the benefit of the Lenders and which are not subject to any other Lien
(other than Permitted Liens) and conform to the warranties contained herein and
which at all times continue to be acceptable to the Agent in the exercise of its
reasonable business judgment and less the applicable Availability Reserves.

         "EMPLOYEE PLAN" shall means any employee benefit plan, program or
policy with respect to which each Company or any ERISA Affiliate may have any
liability or any obligation to contribute, other than a Plan or a Multiemployer
Plan.

         "ENVIRONMENTAL LAWS" shall mean applicable federal, state or local
laws, rules or regulations, and any applicable judicial interpretations thereof,
including any judicial or administrative order, judgment, permit, approval
decision or determination, in each case pertaining to conservation or protection
of the environment, in effect at the time in question, including the Clean Air
Act, the Comprehensive Environmental Response, Compensation and Liability Act
("CERCLA"), the Federal Water Pollution Control Act, the Occupational Safety and
Health Act, the Resource Conservation and Recovery Act, the Safe Drinking Water
Act, the Toxic Substances Control Act, the Superfund Amendments and
Reauthorization Act of 1986, the Hazardous Materials Transportation Act and
analogous state and local laws as may be amended from time to time thereby
imposing either more or less stringent requirements as relates to activity
occurring after the date hereof of any such amendments.

                                               UTI - LOAN AND SECURITY AGREEMENT

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<PAGE>   14

         "EQUIPMENT" shall mean all present and hereafter acquired equipment (as
defined in the U.C.C.) including, without limitation, all Rigs, all Rig
Accessories and all other machinery, equipment, furnishings and fixtures, and
all additions, substitutions and replacements thereof, wherever located,
together with all attachments, components, parts, equipment and accessories
installed thereon or affixed thereto and all proceeds of whatever sort thereof;
provided that notwithstanding the foregoing, Equipment shall not include drill
pipe.

         "EQUIPMENT ADVANCE PERCENTAGE" shall mean fifty percent (50%).

         "ERISA" shall mean the Employee Retirement Income Security Act or 1974,
as amended from time to time, and the rules and regulations promulgated
thereunder from time to time.

         "ERISA AFFILIATE" shall mean (a) any person which, together with each
Company, is treated as a "single employer" under Section 414 of the Internal
Revenue Code of 1986, as amended and the regulations thereunder, and (b) any
Subsidiary of each Company.

         "EVENT(S) OF DEFAULT" shall have the meaning provided for in Section 10
of this Agreement.

         "EXCLUDED L/Cs" shall mean the aggregate undrawn face amount of standby
Letters of Credit, not to exceed $1,700,000 in the aggregate, which Letters of
Credit were issued on account of the Companies to insurance companies to assure
payment of premiums and workers' claims in connection with workers' compensation
claims.

         "EXCESS" shall have the meaning provided for in Section 3, Paragraph 8
of this Agreement.

         "FAIR MARKET VALUE" shall mean, with respect to any asset or property
of any Obligor or any of its Subsidiaries, the value of the consideration
obtained or obtainable in a cash sale of such asset or property in the open
market between a willing buyer and willing seller under no compulsion to sell or
buy, determined in an arm's length negotiation conducted in good faith and in an
orderly market process in the ordinary course of business.

         "FINANCIALLY WEAKENED" shall mean a Person (i) has material
liabilities, contingent or liquidated, which Agent believes, in its discretion,
could be reasonably expected to have a Material Adverse Effect if such Person
were made a participant in the consolidated cash management system of the Parent
and its Subsidiaries or (ii) could reasonably be expected to have such negative
cash flows for the foreseeable future that the Agent finds it unreasonable, in
its discretion, to allow unlimited intercompany loans or advances thereto, or
investments therein, while such condition persists.

         "FINANCIALS" shall have the meaning provided for in Section 7,
Paragraph 18(g) of this Agreement.

         "FISCAL QUARTER" shall mean each three (3) month period ending on March
31, June 30, September 30 and December 31 of each year.

                                               UTI - LOAN AND SECURITY AGREEMENT

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<PAGE>   15

         "FISCAL YEAR" shall mean each twelve (12) month period commencing on
January 1 of each year and ending on the following December 31.

         "FIXED CHARGE COVERAGE RATIO" shall mean, for the twelve month period
ending on the date of the then most recent consolidated financial statements of
the Parent and its Subsidiaries delivered (or required to be delivered) to the
Agent pursuant to Section 7, Paragraph 8, the ratio determined by dividing (a)
EBITDA for Parent on a consolidated basis plus the aggregate of all proceeds
received from the issuance of Capital Stock by (b) the sum (for such period) of
(i) all interest obligations due, (ii) the amount of principal scheduled or
required to be repaid on the Indebtedness For Borrowed Money for Parent on a
consolidated basis, but excluding (A) principal portions of Indebtedness For
Borrowed Money of Parent on a consolidated basis that are repaid or discharged
directly with Capital Stock (which Capital Stock is issued within twelve months
prior to such repayment or discharge), (B) principal portions of Indebtedness
For Borrowed Money and other Indebtedness of the Parent on a consolidated basis
that are refinanced using securities that constitute Indebtedness For Borrowed
Money (other than the Revolving Loans) or proceeds therefrom (which securities
are issued within twelve months prior to such refinancing), (C) the repayment of
up to $3,500,000 of principal amount of the promissory notes originally issued
on July 31, 1998, in the aggregate face amount of $7,790,000 to the former
shareholders of SUITS Enterprises, Inc. in the event the Average Trading Value
(as defined in such notes as in effect on the date hereof) exceeds $30.00 per
share, and (D) principal portions of the Obligations, (iii) Capital Expenditures
(other than for Permitted Acquisitions or replacements of assets subject to
casualty occurrence with similar assets funded from insurance proceeds of such
casualty occurrence or purchases of assets with proceeds from sales of assets
permitted under this Agreement, (iv) all federal, state and local income tax
expenses due and payable, and (v) all dividends of cash and property (other than
dividends of Qualified Capital Stock).

         "GAAP" shall mean generally accepted accounting principles in the
United States of America as in effect from time to time and for the period as to
which such accounting principles are to apply.

         "GENERAL INTANGIBLES" shall have the meaning set forth in the U.C.C.
and shall include, without limitation, all present and future right, title and
interest in and to all tradenames, Trademarks (together with the goodwill
associated therewith), Patents, licenses, customer lists, distribution
agreements, supply agreements, indemnification rights and tax refunds, together
with all monies and claims for monies now or hereafter due and payable in
connection with any of the foregoing or otherwise; all rights to payment,
whether or not yet earned by performance, from time to time arising in
connection with or otherwise relating to sales of Inventory by any Obligor to
its customers including, without limitation, rights to payment from Obligors'
customers pursuant to Obligors' trade credit agreements with their customers;
and all cash and non-cash proceeds thereof.

         "GUARANTY" shall mean one or more guarantees to be executed and
delivered by Guarantors on or before the Closing Date in favor of the Agent in
form acceptable to the Agent, guaranteeing all present and future Obligations
(as the same may be amended, modified or changed from time to time).

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       12
<PAGE>   16

         "GUARANTOR" shall mean any person who now or may hereafter guarantees
payment or performance of all or any part of the Obligations, including, without
limitation, each of the Guarantors (as defined in the first paragraph of this
Agreement).

         "HAZARDOUS MATERIALS" means (a) hazardous waste as defined in
applicable regulations issued pursuant to the Resource Conservation and Recovery
Act of 1976, or in any applicable federal, state or local law or regulation, (b)
hazardous substances, as defined in CERCLA, or in applicable state or local law
or regulation, (c) gasoline or any other petroleum product, (d) toxic
substances, as defined in the Toxic Substances Control Act of 1976, or in any
applicable federal, state or local law or regulation, (e) insecticides,
fungicides, or rodenticides, as defined in the Federal Insecticide, Fungicide,
and Rodenticide Act of 1975, or in any applicable federal, state or, local law
or regulation as each such act, statute or regulation may be amended from time
to time, and (f) asbestos.

         "INDEBTEDNESS" shall mean, without duplication, all liabilities,
contingent or otherwise, which are any of the following: (a) obligations in
respect of money or for the deferred purchase price of property, services or
assets, other than Inventory, or (b) lease obligations which, in accordance with
GAAP, have been, or which should be, capitalized.

         "INDEBTEDNESS FOR BORROWED MONEY" shall mean, without duplication, all
liabilities, contingent or otherwise, which are any of the following: (a)
obligations in respect of borrowed money or for the deferred purchase price of
property, services, stock or assets (and excluding extended trade terms of less
than 365 days for purchases of Equipment, Inventory or services), or (b) lease
obligations which, in accordance with GAAP, have been, or which should be,
capitalized.

         "INDEMNIFIED PERSON" shall have the meaning specified in Section 7,
Paragraph 13 of this Agreement.

         "INDEMNIFIED LIABILITIES" shall have the meaning specified in Section
7, Paragraph 13 of this Agreement.

         "INTELLECTUAL PROPERTY" shall mean all Trademarks, Patents, copyrights,
copyright licenses and other related property which constitute General
Intangibles.

         "INVENTORY" shall mean all of each Company's present and hereafter
acquired inventory (as defined in the U.C.C.) including, without limitation, all
drill pipe and all merchandise, inventory and goods, and all additions,
substitutions and replacements thereof, wherever located, together with all
goods and materials used or usable in manufacturing, processing, packaging or
shipping same; in all stages of production from raw materials through
work-in-process to finished goods and all proceeds thereof of whatever sort;
provided that notwithstanding the foregoing, Inventory shall not include Rigs
and Rig Accessories.

         "ISSUING BANK" shall mean the bank issuing Letters of Credit for any
Company.

         "LETTERS OF CREDIT" shall mean all letters of credit issued with the
assistance of the Agent on behalf of the Lenders by the Issuing Bank for or on
behalf of any Company.

                                               UTI - LOAN AND SECURITY AGREEMENT

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<PAGE>   17

         "LETTER OF CREDIT GUARANTY" shall mean the guaranty delivered by the
Agent in behalf of the Lenders to the Issuing Bank of a Company's reimbursement
obligation under the Issuing Bank's reimbursement agreement, Application for
Letter of Credit or other like document.

         "LETTER OF CREDIT GUARANTY FEE" shall mean the fee the Agent in behalf
of the Lenders may charge the Company under Section 8, Paragraph 6 of this
Agreement for: (a) issuing the Letter of Credit Guaranty or (b) otherwise aiding
the Company in obtaining Letters of Credit.

         "LETTER OF CREDIT SUB-LINE" shall mean $10,000,000 in the aggregate.

         "LIBOR" shall mean at any time of determination with respect to each
interest period, the quotient obtained by dividing (i) the arithmetic average
(rounded to the nearest 1/16 of 1%) of the offered quotation to first-class
banks in the interbank eurodollar market by The Chase Manhattan Bank, N.A. (or
its successor) for U.S. dollar deposits of amounts in same day funds generally
comparable to the aggregate principal amount of the loan for which an interest
rate is then being determined with maturities comparable to the LIBOR Period to
be applicable to such loan, determined as of 10:00 A.M. (New York time) on the
date which is two Business Days prior to the commencement of such LIBOR Period,
(and rounded upward to the next whole multiple of 1/16 of 1%) by (ii) a
percentage equal to 100% minus the then stated maximum rate of all reserve
requirements (including, without limitation, any marginal, emergency,
supplemental, special or other reserves) applicable to any member bank of the
Federal Reserve System in respect of eurocurrency liabilities as defined in
Regulation D (or any successor category of liabilities under Regulation D). In
the event that The Chase Manhattan Bank, N.A. (or its successor) is unable or
unwilling to make the applicable LIBOR rates known to the Agent, or if The Chase
Manhattan Bank, N.A. (or its successor) no longer exists, then for each interest
period LIBOR shall mean the London Interbank Offered rate paid in London on
dollar deposits from other banks as determined by the Agent based upon
information presented on Telerate Systems at Page 3750 as of 11:00 a.m. (London
time) or the date which is on the date which is two Business Days prior to the
commencement of such LIBOR Period (and rounded upward to the next whole multiple
of 1/16 of 1%.

         "LIBOR LOAN" shall mean a Revolving Loan for which a Company has
elected to use LIBOR for interest rate computations.

         "LIBOR PERIOD" shall mean the LIBOR for one month, two month, three
month or six month U.S. dollar deposits, as selected by a Company.

         "LINE OF CREDIT" shall mean the commitment of the Lenders in the
aggregate amount of $65,000,000 to (a) make Revolving Loans pursuant to Sections
3 and 4 of this Agreement, and (b) assist the Companies in opening Letters of
Credit pursuant to Section 5 of this Agreement (up to the Letter of Credit
Sub-Line).

         "LINE OF CREDIT FEE" shall: (a) mean the fee due the Agent for the
benefit of the Lenders at the end of each month for the Line of Credit, and (b)
be determined by multiplying (i) the difference between the Line of Credit and
the sum of (x) the average daily balance of Revolving Loans of all

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       14
<PAGE>   18

Companies plus (y) the average daily undrawn balance of all Letters of Credit
for said month, by (ii) three-eighths of one percent (0.375%) per annum for the
number of days in said month.

         "LOAN DOCUMENTS" shall mean, collectively, this Agreement and all notes
(including the Promissory Notes), guarantees, security agreements and other
agreements, documents and instruments now or at any time hereafter executed
and/or delivered by any Obligor, a Canadian Finance Company or a Canadian
Operating Company in connection with this Agreement (as the same may be amended,
modified or changed from time to time).

         "LOAN FACILITY FEE" shall mean the fee payable to the Agent for the
benefit of the Lenders in accordance with, and pursuant to, the provisions of
Section 8, Paragraph 3 of this Agreement.

         "LOUISIANA PLEDGED COLLATERAL" shall have the meaning provided for in
Section 6, Paragraph 11 of this Agreement.

         "MATERIAL ADVERSE EFFECT" shall mean, relative to any occurrence of
whatever nature (including any adverse determination in any litigation,
arbitration or governmental investigation or proceeding), (a) a material adverse
effect on the financial condition, business, operations, prospects or assets of
(i) the Parent and its Subsidiaries (including the Companies) taken as a whole
or (ii) UTI on an individual basis, or (b) a material impairment of the ability
of (i) the Parent and its Subsidiaries (including the Companies) taken as a
whole or (ii) UTI on an individual basis, to perform obligations under the Loan
Documents to which it is a party or (c) an impairment of the validity or
enforceability of any Loan Document in any manner which materially affects any
material rights and/or material benefits intended to be bestowed on Lenders
and/or the Agent under the Loan Documents.

         "MATURITY DATE" means the fourth anniversary of the Closing Date.

         "MAXIMUM LEGAL RATE" shall mean the maximum lawful interest rate which
may be contracted for, charged, taken, received or reserved under this Agreement
or the Loan Documents by the Agent and/or the Lenders in accordance with
applicable state or federal law (whichever provides for the highest permitted
rate), taking into account all items contracted for, charged or received in
connection with the Obligations evidenced hereby which are treated as interest
under the applicable state or federal law, as such rate may change from time to
time.

         "MOBILE RIGS" shall mean Rigs and Rig Accessories which are attached or
affixed to, or comprise an integral part of, a vehicle, trailer or carrier.

         "MULTIEMPLOYER PLAN" shall mean any plan which is a "multiemployer
plan" (as such term is defined in Section 4001(a)(3) of ERISA) to which each
Company or any ERISA Affiliate contributes or has any obligation or liability to
make contributions, including any withdrawal liability, contingent or otherwise.

         "NET BOOK VALUE" shall mean, the amount determined, on a consolidated
basis, for property, plant and equipment (net of accumulated depreciation) as
reflected on the Parent's consolidated financial statements as determined in
accordance with GAAP.

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       15
<PAGE>   19

         "OBJECTION" means a claim by the Agent in its reasonable discretion
that a Person that is or may be acquired is Financially Weakened.

         "OBLIGATIONS" shall mean all loans, advances, debts, liabilities and
obligations for the performance of covenants, tasks or duties or for payment of
monetary amounts (whether or not such performance is then required or
contingent, or such amounts are liquidated or determinable) owing by any Obligor
to the Agent or any Lender, and all covenants and duties regarding such amounts,
of any kind or nature, present or future, whether or not evidenced by any note,
agreement or other instrument, arising under the Agreement or any of the other
Loan Documents. This term includes all principal, interest (including all
interest which accrues after the commencement of any case or proceeding in
bankruptcy after the insolvency of, or for the reorganization of any Obligor,
whether or not allowed in such proceeding), fees, charges, expenses, attorneys'
fees and any other sum chargeable to any Obligor under the Agreement or any of
the other Loan Documents.

         "OBLIGOR" shall mean each Company and each Guarantor, and "OBLIGORS"
shall mean, collectively, all of the Companies and all of the Guarantors.

         "OECD" means the Organization for Economic Cooperation and Development.

         "OPERATING LEASES" shall mean all leases of property (whether real,
personal or mixed) other than Capital Leases.

         "ORDERLY LIQUIDATION VALUE" shall mean, at any date of determination,
with respect to any Equipment the value that would be obtained from a private
sale thereof (net of sales and liquidation expenses) completed within a six (6)
month period on an "as is and where is" basis where such sale is properly
advertised and conducted under current market conditions by an Approved
Appraiser. In the absence of an actual sale, such value shall have the meaning
customarily determined by appropriate appraisal methodologies in the equipment
appraisal industry at the time of the valuation, less the estimated marshaling,
stacking, reconditioning and sale expenses designed to maximize the resale value
of such Equipment as determined by an Approved Appraiser. Such value shall be
determined based on the then physical condition and location (i.e., "as is and
where is") of such Equipment, and their useful life and remaining useful life.
An Approved Appraiser's valuation, in the absence of a sale, may be made with or
without physical inspection, at the Agent's discretion, and except as otherwise
provided in this Agreement such valuation as set forth in the then most recent
Appraisal of Orderly Liquidation Value shall apply with respect to
determinations of Orderly Liquidation Value under this Agreement.

         "OTHER COLLATERAL" shall mean all now owned and hereafter acquired
deposit accounts maintained with any bank or financial institutions; all cash
and other monies and property in the possession or control of the Agent and/or
the Lenders; all books of account, records, customer lists, customer files,
customer records, data bases and other records in any way relating to any of the
foregoing, ledger cards, disks and related data processing computers and
software and all rights, licenses, privileges, trade secrets and other rights
for the possession and operation of same, at any time evidencing or containing
information relating to any of the Collateral described herein, or

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       16
<PAGE>   20

otherwise necessary or helpful in the collection thereof or realization thereon;
all pension plan reversions; all letters of credit, credit memoranda and advices
of credit for the benefit of Company, and all of Company's rights to enforce and
receive payment thereof; all now owned and hereafter acquired investment
property, including all "Investment Property" as that term is defined in Section
9-115 of the U.C.C.; and all cash and non-cash proceeds of the foregoing.

         "OTHER OVERADVANCES" shall have the meaning provided for in Section 8,
Paragraph 1(b) of this Agreement.

         "OUT-OF-POCKET EXPENSES" shall mean all of the Agent's and/or the
Lenders' present and future reasonable out of pocket expenses incurred relative
to this Agreement, whether incurred heretofore or hereafter, which expenses
shall include, without being limited to, the reasonable fees, costs and expenses
of the Agent's and/or Lenders' legal counsel in connection with the preparation,
negotiation, execution, amendment, administration and enforcement of this
Agreement and/or the other loan and security documents executed in connection
herewith or relating hereto from time to time, the cost of record searches, all
costs and expenses incurred by the Agent and/or the Lenders in opening bank
accounts, depositing checks, receiving and transferring funds, and any charges
imposed on the Agent and/or the Lenders due to "insufficient funds" of deposited
checks and the Agent's and/or the Lenders' standard fee relating thereto, any
amounts paid by the Agent in behalf of the Lenders, incurred by or charged to
the Agent in behalf of the Lenders by the Issuing Bank under the Letter of
Credit Guaranty or any Company's reimbursement agreement, application for Letter
of Credit or other like document which pertain either directly or indirectly to
such Letters of Credit, and the Agent's and/or the Lenders' standard fees
relating to the Letters of Credit and any drafts thereunder, reasonable travel,
lodging and similar expenses of the Agent's personnel inspecting and monitoring
the Collateral from time to time hereunder, local counsel fees, title insurance
premiums, real estate survey costs, fees and taxes relative to the filing of
financing statements, costs of preparing and recording mortgages/deeds of trust
against the Real Estate and all expenses, costs and fees set forth in Section
10, Paragraph 3 of this Agreement.

         "OVERADVANCES" shall have the meaning provided in Section 3, Paragraph
1.

         "OVERADVANCE RATE" shall mean a rate equal to one-half of one percent
(1/2%) per annum in excess of the applicable contract rate of interest
determined in accordance with Section 8, Paragraph 1(a) of this Agreement.

         "PATENTS" shall mean all present and hereafter acquired patents and/or
patent rights of each Company and all cash and non-cash proceeds thereof.

         "PERMITTED ACQUISITION" shall mean an Acquisition of any of the
following in a transaction that meets the conditions precedent and other
criteria for an Acquisition Facility Loan set forth in Section 4 of this
Agreement (whether or not the proceeds of any Acquisition Facility Loans will be
used in connection with such acquisition):

                  (a) Rigs and/or Rigs Accessories (but excluding (i)
maintenance and replacement components and parts (including installation)
acquired in the ordinary course of business for existing

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       17
<PAGE>   21

Rigs and Rigs acquired hereafter, (ii) drill pipe acquired in the ordinary
course of business for Rigs, or (iii) purchases of tangible assets pursuant to
the reinvestment of casualty insurance proceeds); and

                  (b) acquisitions of 90% or more of the Capital Stock or all or
substantially all of the assets of a Person engaged primarily in a Qualifying
Business.

         "PERMITTED BUSINESS INVESTMENTS" means:

                  (a) investments by UTI in any Person engaged primarily in a
Qualified Business which, immediately after the making of such investment, is or
becomes a Substantially-Owned Subsidiary of UTI and an Obligor pursuant to
Section 4, provided that the Parent has furnished to the Agent the information
described in Section 4 of this Agreement, except that such investments shall not
be Permitted Business Investments to the extent that the Agent reasonably
determines that the liabilities and other obligations (contingent or otherwise)
of any Obligor resulting therefrom or associated therewith could reasonably be
expected to have a Material Adverse Effect;

                  (b) loans and other extensions of credit to officers,
directors and employees of any Obligor and its Subsidiaries for travel,
entertainment and moving and other relocation expenses made in direct
furtherance and in the ordinary course of the business of any such Obligor or
its Subsidiaries, provided that the aggregate principal amount of loans and
other extensions of credit made pursuant to this clause (b) does not exceed
$1,000,000 at any one time outstanding;

                  (c) loans by any Obligor to NDM for NDM's working capital
needs in an amount not to exceed $3,000,000 outstanding at any one time in the
aggregate with respect to all loans by Obligors.

                  (d) payments to any employee, officer or director of any
Obligor or any of its Subsidiaries pursuant to employee benefit plans or
compensation arrangements entered into in the ordinary course of business and
approved by the Board of Directors of the applicable Obligor or such Subsidiary
or payments, contributions or transactions relating to such plans; and

                  (e) Permitted Joint Venture Investments;

                  (f) Advances, contributions and loans or other investments, by
an Obligor, in or to, a Canadian Operating Company for the purpose of
consummating Permitted Acquisitions and working capital and other general
purposes; provided that (i) the amount of such advances, contributions and loans
do not exceed in the aggregate 125% of the total purchase price of Permitted
Acquisitions consummated by such Canadian Operating Company, (ii) no more than
27% of such advances, contributions and loans may be in the form of an advance,
contribution or other investment that is not a loan, and (iii) all such loans
are secured by a Canadian First Priority Lien.

                  (g) Advances, contributions, loans or other investments by an
Obligor in or to a Canadian Finance Company, provided that,

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       18
<PAGE>   22

                           (i) such advances, contributions, loans and other
investments are for the purpose of funding the purchase from an Obligor of loans
made pursuant to paragraph (f) of this definition or for general corporate and
working capital of such Canadian Finance Company;

                           (ii) such advances, contributions, loans or other
investments are for the purpose of enabling such Canadian Finance Company to
make loans to a Canadian Operating Company for the purpose of consummating
Permitted Acquisitions or for general corporate and working capital purposes,
provided that (A) the loans made by the Canadian Finance Company to the Canadian
Operating Company do not exceed in the aggregate 125% of the total purchase
price of Permitted Acquisitions consummated by such Canadian Operating Company
less any advances, contributions, loans or investments made by an Obligor to the
Canadian Operating Company pursuant to paragraph (f) of this definition, and (B)
all such loans made by the Canadian Finance Company to the Canadian Operating
Company are secured by a Canadian First Priority Lien; or

                           (iii) the purpose of such advances, contributions,
loans or other investments is for the purpose of purchasing loans made by
another Canadian Finance Company to a Canadian Operating Company pursuant to
clause (g)(ii) of this definition and the cash proceeds of the loans being
purchased are being used to repay amounts due hereunder; or

                           (iv) the purpose of such advances, contributions,
loans and investments is to purchase loans (that do not exceed 125% of the total
purchase price of Canadian Operating Company less any advances, contributions,
loans or investments made by an Obligor to the Canadian Operating Company
pursuant to paragraph (g) of this definition) made by a third party to a
Canadian Operating Company that are secured by a Canadian First Priority Lien.

         "PERMITTED FINANCIAL INVESTMENTS" means the following kinds of
instruments to the extent that the aggregate amount thereof outstanding do not
exceed $15,000,000 at any time (except that such $15,000,000 limitation shall
not apply for instruments described in subparagraphs (c) or (g) or (h)
immediately below or in the event that no Revolving Loan is outstanding) during
which there are any Revolving Loans outstanding:

                  (a) investments in certificates of deposit in United States
dollars or Canadian dollars maturing within one year from the date of issuance
thereof, and overnight investments, issued by a bank or trust (i) organized
under the laws of the United States or any state thereof, having capital,
surplus and undivided profits aggregating at least $500,000,000, or (ii)
organized under the laws of any jurisdiction other than the United States or any
state thereof, provided that such foreign bank shall be one of the three most
reputable, creditworthy banks in such country; or (iii) organized under the laws
of Canada or any province thereof, having capital, surplus and undivided profits
aggregating at least $500,000,000 or the Canadian dollar equivalent thereto;

                  (b) deposit accounts (i) in a bank or trust organized under
the laws of the United States or any state thereof or Canada or any province
thereof, having capital surplus and undivided profits aggregating at least
$200,000,000 and whose commercial paper (or that of the holding company with
which such bank or trust company is affiliated) is rated A-1 or better by
Standard & Poor's Rating Group or P-1 or better by Moody's Investors Service,
Inc. or Canadian equivalent

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       19
<PAGE>   23

rating service, if applicable, (ii) in banks outside of the United States, in
currencies other than U.S. dollars, which banks provide working capital,
operating accounts or similar services to one or more Subsidiaries of an Obligor
at such foreign banks, provided that such foreign bank shall be one of the three
most reputable, creditworthy banks in such country and (iii) in a bank organized
under the laws of the United States or any state thereof or Canada or any
province thereof not included in the descriptions in clause (i) or (ii) above,
so long as the aggregate amount on deposit in such bank by any Obligor and its
Subsidiaries does not exceed $5,000,000 or the Canadian equivalent thereof;

                  (c) receivables arising from the sale of goods and services in
the ordinary course of business of any Obligor and its Subsidiaries;

                  (d) investments in eurodollars not in excess of $10,000,000 in
the aggregate at any time outstanding, issued by any bank or trust company
having capital, surplus and undivided profits aggregating at least $500,000,000
and whose long term certificates of deposit are, at the time of acquisition
thereof by any Obligor, rated A-1 or better by Standard & Poor's Ratings Group
of P-1 or better by Moody's Investor Service, Inc.;

                  (e) marketable direct obligations issued or unconditionally
guaranteed by the United States or Canadian government or issued by any agency
thereof and backed by the full faith and credit of the United States or Canada,
as the case may be, in each case maturing no later than one year from the date
of acquisition;

                  (f) money market, mutual or similar funds that invest in
obligations referred to in clauses (a) or (d) of this definition, in each case
having assets in excess of $500,000,000;

                  (g) currency price hedging agreements, using customary ISDA
swap documentation or comparable documentation, entered into for the purpose of
hedging actual exposure on the currency price risks of its Qualified Business
and not speculation (with a maximum liability not to exceed US $5,000,000 at any
time for hedging of Mexican Pesos); or

                  (h) the acquisition or ownership of Capital Stock or
obligations or securities received in settlement of debts (created in the
ordinary course of business) owing to any Obligor thereof.

         "PERMITTED INDEBTEDNESS" shall mean without duplication: (i) current
indebtedness maturing in less than one year and incurred in the ordinary course
of business for raw materials, supplies, equipment, services, taxes or labor;
(ii) purchase money indebtedness secured only by the Purchase Money Liens; (iii)
Subordinated Debt; (iv) deferred taxes and other expenses incurred in the
ordinary course of business; (v) other indebtedness existing on the date of
execution of this Agreement and listed in the most recent financial statement
delivered to the Agent and the Lenders or otherwise disclosed in the Loan
Documents to the Agent in writing; (vi) Indebtedness of (a) an Obligor owed to
another Obligor, and (b) Indebtedness of an Obligor owed to a Subsidiary of the
Parent that is not an Obligor, provided that such Indebtedness (other than
accounts payable and intercompany charges in the ordinary course of business) is
evidenced by a promissory note and is subordinated in writing (in a manner
reasonably satisfactory to the Agent) in right of payment to the prior payment
in full of

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       20
<PAGE>   24

the Obligations (c) of the Parent or any Subsidiary thereof to the Parent or to
any other Subsidiary thereof pursuant to the concentrated cash management system
for (1) collections of accounts receivable or (2) disbursements to trade
creditors; (vii) Indebtedness assumed as part of the acquisition of any entity
or asset by any Obligor or any Subsidiary thereof, whether by merger,
consolidation, purchase of assets or otherwise; provided that (A) such
Indebtedness is not created, incurred or assumed in contemplation of such
acquisition of such entity or asset and (B) the aggregate amount of all such
Indebtedness constituting Indebtedness For Borrowed Money does not exceed
$5,000,000 outstanding at any time, and (C) any Indebtedness discharged at the
closing of such acquisition shall not be deemed or constitute assumed
Indebtedness; (viii) Indebtedness arising from the honoring by a bank or other
financial institution of a check, draft or similar instrument inadvertently
(except in the case of daylight overdrafts) drawn against insufficient funds in
the ordinary course of business; provided that such Indebtedness is extinguished
within two Business Days; (ix) Indebtedness arising from agreements providing
for indemnification, adjustment of purchase price or similar obligations, or
from guarantees, letters of credit, surety bonds or performance bonds securing
any obligation of any Obligor, or any Subsidiary thereof, incurred or assumed in
connection with the disposition of any business, assets or any Subsidiary of the
Parent or any other Obligor or Subsidiary thereof other than Guarantees by any
Obligor or any Subsidiary thereof of Indebtedness For Borrowed Money incurred by
any Person acquiring all or a portion of such business, asset or Subsidiary for
the purpose of financing such acquisition; provided that the maximum aggregate
liability with respect to all such Indebtedness and the amount of Indebtedness
subject to such Guarantees in each case with respect to a particular
transaction, shall at no time exceed the gross proceeds actually received from
the sale of such business, asset or Subsidiary; (x) Indebtedness constituting
the net obligations of a Person as of the date of a required calculation under
currency hedging agreements entered into in the ordinary course of business and
not for the purposes of speculation; (xi) Permitted Obligor Refinancing
Indebtedness; (xii) Indebtedness constituting a Permitted Business Investment
(without duplication); (xiii) Indebtedness of a Subsidiary of any Obligor
incurred in connection with a transaction permitted under Section 7, Paragraph
10H of this Agreement; (xiv) Indebtedness of the Obligors to the Agent and/or
the Lenders arising under this Agreement and the other Loan Documents; (xv)
Indebtedness of any Obligor or any Subsidiary thereof, not otherwise described
above, not to exceed in the aggregate with respect to all Obligors and
Subsidiaries taken as a whole $5,000,000 outstanding at any one time.

         "PERMITTED INTERCOMPANY BALANCES" means loans, advances, inter-company
accounts, transfers and investments (including, but not limited to, loans made
pursuant to the concentrated cash management system for collections of accounts
receivable or disbursements to trade creditors) by any Obligor in, with or to
any other Obligor; provided that (i) each such lender and borrower (or
transferor and transferee, as the case may be) Obligor is Solvent after giving
effect thereto, (ii) each such Obligor has received reasonably equivalent value
in exchange for the transfers made and obligations incurred by it in connection
therewith and (iii) loans, transfers or advances to or investments in Restricted
Subsidiaries which were effected after the date of acquisition thereof by an
Obligor that do not exceed in the aggregate the amount obtained by subtracting
from the applicable Restricted Subsidiary Borrowing Base an amount equal to
Revolving Loans from the Lenders to such Restricted Subsidiary.

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       21
<PAGE>   25

         "PERMITTED JOINT VENTURES" means an investment in a limited liability
company, limited partnership or other entity for which there is no recourse
liability beyond the amount of the investment made other than an Obligor (a)
that is engaged in a Qualified Business; and (b) no debt or equity interest in
which (other than directors' qualifying shares with respect to corporations
formed under the laws of any country other than the United States of America) is
or will be held by an officer or director of the Obligor or of any Subsidiary
thereof, or any spouse, immediate family member of, or other relative having the
same principal residence as, any such officer or director, or any trust the
beneficiary of which is any of the foregoing parties or any other Affiliate of
the Obligor (except the Obligor or any Subsidiary thereof).

         "PERMITTED JOINT VENTURE INVESTMENTS" means investments by any Obligor
in a Permitted Joint Venture if, after giving effect to such Investment, the
aggregate fair market value of all assets of the Obligors (determined on the
date of transfer) transferred since the Closing Date to Permitted Joint Ventures
(less the lesser of (a) aggregate fair market value (as determined in good faith
by the Board of Directors of the Parent and evidenced by a resolution duly
adopted by the Board of Directors of the Parent) and (b) the aggregate fair
market value of all such assets subsequently transferred back to the Obligor)
would not exceed five percent (5%) of the consolidated net worth of the Parent
determined as of the end of the Parent's most recent fiscal quarter for which
financial information is available immediately prior to the date of
determination); provided that the Parent has provided to the Agent the
information described in Section 4 of this Agreement, except that such
investments shall not be Permitted Joint Venture Investments to the extent that
the Agent reasonably determines that the liabilities an other obligations
(contingent or otherwise) of any Obligor resulting therefrom or associated
therewith could reasonably be expected to have a Material Adverse Effect.

         "PERMITTED LIENS" shall mean: (a) liens existing on the date hereof and
listed on Schedule 1 hereto and other liens expressly permitted, or consented
to, by the Agent; (b) Purchase Money Liens; (c) Customarily Permitted Liens; (d)
liens granted to the Agent by any of the Companies; (e) liens for taxes not yet
due and payable or which are being diligently contested in good faith by Parent
or any direct or indirect Subsidiary thereof by appropriate proceedings and
which liens are not (i) other than with respect to Real Estate, senior to the
liens of the Agent or (ii) for taxes due the United States of America; (f) any
renewal for any lien permitted by any of the preceding clauses with respect to
the assets originally subject to such lien; provided that (i) the obligation
secured is not increased to an amount greater than the outstanding amount
secured by such lien as of the date of such renewal, (ii) the terms of the lien
remain substantially identical to original terms and (ii) such lien is secured
only by liens on those assets that secured such obligation prior to the renewal;
(g) liens securing Permitted Obligor Refinancing Indebtedness, so long as such
Permitted Obligor Refinancing Indebtedness is secured only by liens on those
assets that secured such Indebtedness prior to the renewal, extension,
refinancing, refund or repurchase or by liens otherwise permitted by this
definition; (h) liens on assets acquired in a Permitted Acquisition that secure
only Permitted Indebtedness assumed in such Permitted Acquisition (provided such
liens that would not constitute Customarily Permitted Liens are disclosed to the
Agent in connection with the delivery of information regarding such Permitted
Acquisition pursuant to Section 4 of this Agreement); and (i) Customarily
Permitted Liens on assets acquired, whether acquired in an asset purchase
transaction or a stock purchase transaction, in a Permitted Acquisition.

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       22
<PAGE>   26

         "PERMITTED OBLIGOR REFINANCING INDEBTEDNESS" means (a) Indebtedness of
any Obligor existing on the Closing Date, the terms of which have been amended,
modified or supplemented in a manner that such Indebtedness does not (i)
adversely affect the priority of such Indebtedness in right of payment in
relation to the Revolving Loans, (ii) accelerate the maturity of such
Indebtedness or (iii) shorten the Average Life of such Indebtedness and (b)
Indebtedness of any Obligor, the net proceeds of which are used to renew,
extend, refinance, refund or repurchase outstanding Indebtedness of the Obligor;
provided that (A) if the Indebtedness being renewed, extended, refinanced,
refunded or repurchased is pari passu with or subordinated in right of payment
to the Revolving Loans, then such Indebtedness is pari passu with or
subordinated in right of payment to the Revolving Loans at least to the same
extent as the Indebtedness being renewed, extended, refinanced, refunded or
repurchased, (B) such Indebtedness is incurred that is equal to or greater than
the remaining Average Life at the time such Indebtedness is scheduled to mature
no earlier than the Indebtedness being renewed, extended, refinanced, refunded
or repurchased and such Indebtedness has an Average Life at the time such
Indebtedness is incurred that is equal to or greater than the remaining Average
Life of the Indebtedness being renewed, extended, refinanced, refunded or
repurchased; provided, further, that such Indebtedness is in an aggregate
principal amount (or, if such Indebtedness is issued at a price less than the
principal amount thereof, the aggregate amount of gross proceeds therefrom is)
not in excess of the sum of (x) the aggregate principal amount then outstanding
of the Indebtedness being renewed, extended, refinanced, refunded or repurchased
(or if the Indebtedness being renewed, extended, refinanced, refunded or
repurchased was issued at a price less than the principal amount thereof, then
not in excess of the amount of liability in respect thereof determined in
accordance with GAAP, (y) the amount of accrued and unpaid interest, if any, on
the Indebtedness being renewed, extended, refinanced, refunded or repurchased
and (z) the amount of fees, expenses and costs related to the incurrence of such
Permitted Obligor Refinancing Indebtedness; provided that, after giving effect
thereto, the scheduled payments or aggregate outstanding amount of such
Indebtedness is not increased to an amount greater than the outstanding amount
thereof as of the date of such renewal, extension, refinancing, refund or
repurchase, and (C) the material terms of such Indebtedness shall be
substantially identical to the term that existing prior to such renewal,
extension, refinancing, refund or repurchase except as expressly provided above.

         "PERSON" shall mean any individual, partnership, joint venture, firm,
corporation, limited liability company or partnership, association, trust or
other enterprise or any government or political subdivision or any agency,
department or instrumentality thereof.

         "PLAN" shall mean any employee pension benefit plan (as defined in
Section 3(2) of ERISA), subject to Title IV of ERISA or Section 412 of the
Internal Revenue Code of 1986, as amended, other than a Multiemployer Plan, with
respect to which Parent, its Subsidiaries or an ERISA Affiliate contributes or
has an obligation or liability to contribute, including any such plan that may
have been terminated.

         "PROJECTIONS" shall have the meaning provided for in Section 7,
Paragraph 18(g) of this Agreement.

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       23
<PAGE>   27

         "PROMISSORY NOTES" shall mean each and every Revolving Loan Promissory
Note, in the form of Exhibit A attached hereto, delivered by the Companies to
the Agent to evidence the Revolving Loans, pursuant to, and repayable in
accordance with, the provisions of Section 3 of this Agreement.

         "PURCHASE MONEY LIENS" shall mean liens on any item of equipment
acquired after the date of this Agreement; provided that (i) each such lien
shall attach only to the property to be acquired, (ii) for each aggregate
purchase price for equipment in excess of $500,000, a description of the
property so acquired is furnished to the Agent contemporaneously with the
acquisition thereof, and (iii) the debt incurred in connection with such
acquisitions shall not exceed in the aggregate $5,000,000 incurred in any Fiscal
Year.

         "QUALIFIED BUSINESS" means the business of oil and gas well drilling,
oil and gas well construction, oil and gas well completion and oil and gas well
workover or well service, and any business reasonably related thereto.

         "QUALIFIED DOMESTIC RIGS" shall mean (i) Domestic Rigs and (ii) Mobile
Rigs (which are located in the United States) to the extent Agent determines
that such Mobile Rigs are subject to a perfected first priority lien in favor of
the Agent and securing all Obligations.

         "QUALIFIED STOCK" means, with respect to any Person, any Capital Stock
of such Person or a Subsidiary of Such Person that is not Disqualified Stock.

         "REAL ESTATE" shall mean fee and/or leasehold interests in the real
property of each Obligor and each Subsidiary thereof which may be encumbered,
mortgaged, pledged or assigned to the Agent or its designee in accordance with
the terms of the Loan Documents from time to time.

         "REGULATION D" shall mean Regulation U of the Board (respecting
eurocurrency liabilities), and all official rulings and interpretations
thereunder or thereof.

         "REGULATION U" shall mean Regulation U of the Board (respecting margin
credit extended by banks), as the same is from time to time in effect, and all
official rulings and interpretations thereunder or thereof.

         "REGULATION X" shall mean Regulation X of the Board (respecting the
Companies who obtain margin credit), as the same is from time to time in effect,
and all official rulings and interpretations thereunder or thereof.

         "REQUESTED OVERADVANCES" shall have the meaning provided for in Section
8, Paragraph 1(b) of this Agreement.

         "REQUIRED LENDERS" shall mean Lenders holding more than sixty-five
percent (65%) of the outstanding loans, advances, extensions of credit and
commitments to each Company hereunder.

         "RESTRICTED PAYMENT" means (a) any dividend or other distribution,
direct or indirect, on account of any shares of any class of stock of any of the
Obligors now or hereafter outstanding,

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       24
<PAGE>   28

(b) any redemption, retirement, purchase or other acquisition, direct or
indirect, of any shares of any class of stock of any of the Obligors, now or
hereafter outstanding, or of any warrants, rights or options to acquire any such
shares, except to the extent that the consideration therefor consists of shares
of stock (including warrants, rights or options relating thereto) of the Parent,
and (c) any investment, loan or advance by any of the Obligors not permitted
under Section 7, Paragraph 10G.

         "RESTRICTED SUBSIDIARY BORROWING BASE" means with respect to each
Restricted Subsidiary, the sum of (A) the product of the Eligible Accounts
Receivable of a Restricted Subsidiary multiplied by the Accounts Receivable
Advance Percentage, and (B) the product of the Eligible Equipment of such
Restricted Subsidiary multiplied by the Equipment Advance Percentage.

         "RESTRICTED SUBSIDIARIES" means first tier Subsidiaries of Parent
formed, or acquired, after the date hereof (a) in connection with a business
acquisition that the parties thereto have attempted to structure as a
transaction that satisfies the requirements of Section 368 of the Internal
Revenue Code of 1986, as amended, or (b) is designated as such by the Agent
pursuant to Section 4, Paragraph 5(b) of this Agreement and (c) otherwise
satisfies the requirements to be a Company in accordance with Section 4,
Paragraph 5(a) hereof.

         "REVOLVING LOANS" shall mean the loans and advances made, from time to
time, to or for the account of each Company by the Agent on behalf of the
Lenders pursuant to Section 3 or Section 4 of this Agreement.

         "REVOLVING LOAN ACCOUNT" shall have the meaning specified in Section 3,
Paragraph 6 of this Agreement.

         "REVOLVING LOAN COMMITMENT" shall mean, with respect to each Lender,
the amount set forth under Lender's name on the signature pages hereof, or
acquired by a Lender pursuant to Section 13, Paragraph 9, evidencing the amount
of its commitment to make Revolving Loans, as the same may be reduced from time
to time pursuant to this Agreement.

         "REVOLVING LOAN PROMISSORY NOTE" shall mean the promissory note in the
form of Exhibit A hereto executed by each Company to evidence the Revolving
Loans made by the Agent on behalf of the Lenders to each Company pursuant to
Section 3 of this Agreement.

         "RIG(S)" shall mean all land-based drilling and workover rigs owned by
any Company, together with all Rig Accessories which are installed on or affixed
to such Rig (but excluding hard rock boring machinery and equipment directly
owned by UHRB).

         "RIG ACCESSORIES" shall mean pumps, drilling equipment, machinery,
equipment and parts and other miscellaneous assets indirect or necessarily
related to the ownership of Rigs (but excluding hard rock boring machinery and
equipment).

         "SETTLEMENT DATE" shall mean the date, weekly, and more frequently, at
the discretion of the Agent, upon the occurrence of an Event of Default or a
continuing decline or increase of the Revolving Loans that the Agent and the
Lenders shall settle amongst themselves so that (x) the Agent

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       25
<PAGE>   29

shall not have, as Agent, any money at risk and (y) on such Settlement Date the
Lenders shall have a pro rata amount of all outstanding Revolving Loans,
provided that each Settlement Date for a Lender shall be a Business Day on which
such Lender and its bank are open for business.

         "SOLVENT" shall mean, with respect to any Person, (i) the fair value of
such Person's assets exceeds the fair value of such Person's liabilities; (ii)
such Person is generally able to pay its debts as they become due and payable;
and (iii) such Person does not have unreasonably small capital to carry on its
business as it is currently conducted absent extraordinary and unforeseen
circumstances.

         "SUBORDINATED AGREEMENT" shall have the meaning specified in Section 7,
Paragraph 1 of this Agreement.

         "SUBORDINATED DEBT" shall mean (i) the Indebtedness For Borrowed Money
due a Subordinating Creditor (and the note evidencing such) which has been
subordinated, by a Subordination Agreement, to the prior payment and
satisfaction of the Obligations to the Agent and/or the Lenders (in form and
substance satisfactory to the Agent), or (ii) the Indebtedness For Borrowed
Money due to a creditor which Indebtedness For Borrowed Money has been
subordinated to the prior payment and satisfaction of the Obligations to the
Agent and the Lenders, by means of a written agreement whose terms are
substantially similar to a Subordination Agreement.

         "SUBORDINATING CREDITOR" shall mean any party hereafter executing a
Subordination Agreement.

         "SUBORDINATION AGREEMENT" shall mean (i) any agreement among any or all
Obligors, a Subordinating Creditor, the Agent and, at the discretion of the
Agent, the Lenders (or any of them) or (ii) any agreement among any or all
Obligors, as the Subordinating Creditor, the Agent and, at the discretion of the
Agent, the Lenders (or any of them), pursuant to which, in either case, the
Subordinated Debt is subordinated to the prior payment and satisfaction of the
Obligations to the Agent and the Lenders in form and substance satisfactory to
the Agent upon execution and delivery thereof (as the same may be amended,
modified or changed from time to time).

         "SUBSIDIARY" shall mean any corporation or other entity of which a
Person owns, directly or indirectly, through one or more intermediaries, more
than 50% of the Capital Stock or other equity interest at the time of
determination.

         "SUBSTANTIALLY-OWNED SUBSIDIARY" means a Subsidiary of an Obligor in
which such Obligor owns and controls, directly or indirectly, not less than
ninety percent (90%) of the capital stock thereof (with power to vote on and
control all matters of such Subsidiary).

         "TANGIBLE NET WORTH" shall mean at any date, total assets at such date
less the sum of (a) intangible assets and (b) total liabilities, and shall be
determined in accordance with GAAP, on a consistent basis with the latest
audited financial statements.

         "TARGET" shall have the meaning assigned to such term in Section 4 of
this Agreement.

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       26
<PAGE>   30

         "TRADE ACCOUNTS RECEIVABLE" shall mean that portion of Accounts which
arises from the sale of Inventory or the rendition of services in the ordinary
course of business.

         "TRADEMARKS" shall mean all present and hereafter acquired trademarks
and/or trademark rights (together with the goodwill associated therewith) and
all cash and non-cash proceeds thereof.

         "TRANSFEREE" shall have the meaning provided for in Section 13,
Paragraph 5(b) of this Agreement.

         "TRIGGERING EVENT" shall have the meaning provided for in Section 3,
Paragraph 4 of this Agreement.

         "TTM EBITDA" shall mean, as of any date of determination thereof,
EBITDA of the Parent and all of its Subsidiaries on a consolidated basis for the
twelve (12) consecutive month period immediately preceding the date of
determination thereof; provided that, (i) on December 31, 1999, TTM EBITDA shall
be determined for the twelve month period immediately preceding December 31,
1999 by multiplying the EBITDA for the period from June 30, 1999 through
December 31, 1999 by 2, and (ii) on March 31, 2000, TTM EBITDA shall be
determined for the twelve month period immediately preceding March 31, 2000 by
multiplying the EBITDA for the period from June 30, 1999 through March 31, 2000
by 1.333.

         "U.C.C." shall mean the Uniform Commercial Code as in effect from time
to time in the State of Texas.

SECTION 2. CONDITIONS PRECEDENT

         The obligation of the Agent and the Lenders to make loans hereunder is
subject to the satisfaction of, or waiver of, immediately prior to or
concurrently with the making of such loans, the following conditions precedent:

         (a) LIEN SEARCHES - The Agent shall have received tax, judgment and
U.C.C. searches satisfactory to the Agent for all locations presently occupied
or used by any Obligor.

         (b) CASUALTY INSURANCE - The Companies shall have delivered to the
Agent evidence satisfactory to the Agent that casualty insurance policies
listing Agent as loss payee or mortgagee, as the case may be, are in full force
and effect, all as set forth in Section 7, Paragraph 5 of this Agreement.

         (c) UCC FILINGS - Any documents (including, without limitation,
financing statements) required to be filed in order to create, in favor of the
Agent for the benefit of the Lenders a first and exclusive perfected security
interest in the Collateral with respect to which a security interest may be
perfected by a filing under the U.C.C. shall have been properly filed in each
office in each jurisdiction required in order to create in favor of the Agent
for the benefit of the Lenders a perfected lien on the Collateral. The Agent
shall have received acknowledgement copies of all such filings (or, in lieu
thereof, the Agent shall have received other evidence satisfactory to the Agent
that all such filings

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       27
<PAGE>   31

have been made); and the Agent shall have received evidence that all necessary
filing fees and all taxes or other expenses related to such filings have been
paid in full.

         (d) PAYMENT OF FEES AND EXPENSES - The fees and expenses, payable on or
before the Closing Date as described in Section 8 of this Agreement, shall have
been paid in full.

         (e) GUARANTEES - One or more guarantees shall have been executed and
delivered by Guarantors in favor of the Agent in form acceptable to the Agent,
guaranteeing all present and future Obligations.

         (f) OPINIONS - Counsel for each Obligor shall have delivered to the
Agent opinions satisfactory to the Agent opining, inter alia, that, subject to
the (i) filing, priority and remedies provisions of the U.C.C., (ii) the
provisions of the Bankruptcy Code, insolvency statutes or other like laws, (iii)
the equity powers of a court of law and (iv) such other matters as may be agreed
upon with the Agent: (a) this Agreement, (b) the Guaranty of the Guarantors, and
(c) all other specifically identified loan documents of each Obligor, (x) are
valid, binding and enforceable according to their terms, (y) are duly authorized
and (z) do not violate any terms, provisions, representations or covenants in
the charter or by-laws of any Obligor or, to the best knowledge of such counsel,
of any material loan agreement, mortgage, deed of trust, note, security or
pledge agreement or indenture to which any Obligor is a signatory or by which
any Obligor or its assets is bound. In addition, counsel for the Subordinating
Creditor(s) shall have delivered an opinion satisfactory to the Agent that the
Subordination Agreement(s) have been duly authorized, executed and delivered and
constitute valid and binding agreements enforceable against such Subordinating
Creditor(s) in accordance with the terms thereof.

         (g) PLEDGE AGREEMENT - Each Guarantor, as a pledgor, shall (a) execute
and deliver to the Agent for the benefit of the Lenders a pledge and security
agreement and stock powers pledging to the Agent for the benefit of the Lenders,
as additional Collateral, all of the issued and outstanding stock of any and all
of its Subsidiaries and, (b) deliver to the Agent for the benefit of the Lenders
the stock certificates evidencing such stock together with duly executed stock
powers with respect thereto.

         (h) ADDITIONAL DOCUMENTS - Each Obligor shall have executed and
delivered to the Agent all loan documents necessary to consummate the lending
arrangement contemplated by the Loan Documents.

         (i) SUBORDINATION AGREEMENT - The Subordinating Creditors, which shall
include each Obligor in one Subordination Agreement and Canpartners Investments
IV, LLC in another Subordination Agreement, shall have executed and delivered to
the Agent their respective Subordination Agreements, in form and substance
satisfactory to the Agent, subordinating the debt due the Subordinating Creditor
by any Obligor to the prior payment and satisfaction of the Obligations to the
Agent and/or the Lenders.

         (j) BOARD RESOLUTION - The Agent shall have received a copy of the
resolutions of the Board of Directors of each Obligor authorizing the execution,
delivery and performance of (i) this

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<PAGE>   32

Agreement, (ii) the Guaranty (in the case of Guarantors); and (iii) any related
agreements, in each case certified by the Secretary or Assistant Secretary of
the applicable Obligor as of the date hereof, together with a certificate of the
Secretary or Assistant Secretary of the applicable Obligor as to the incumbency
and signature of the officers of the applicable Obligor executing such
agreements and any certificate or other documents to be delivered by them
pursuant hereto, together with evidence of the incumbency of such Secretary or
Assistant Secretary.

         (k) CORPORATE/LIMITED PARTNERSHIP ORGANIZATION - The Agent shall have
received (i) a copy of the Certificate of Incorporation of each corporate
Obligor certified by the Secretary of State of its incorporation, (ii) a copy of
the By-Laws (as amended through the date hereof) of each corporate Obligor,
certified by the Secretary or Assistant Secretary thereof; and (iii) a copy of
the certificate of limited partnership of each limited partnership which is an
Obligor certified by the secretary of state of the state of its formation.

         (l) OFFICER'S CERTIFICATE - The Agent shall have received an executed
Officer's Certificate of each Obligor, satisfactory in form and substance to the
Agent, certifying that: (i) the representations and warranties contained herein
are true and correct in all material respects on and as of the date hereof; (ii)
each Obligor is in compliance with all of the terms and provisions set forth in
the Loan Documents to which it is a party; and (iii) no Default or Event of
Default has occurred and is continuing.

         (m) ABSENCE OF DEFAULT AND MATERIAL ADVERSE CHANGE - No Default, Event
of Default has occurred and is continuing or material adverse change in the
financial condition, business, prospects, profits, operations or assets of any
Obligor shall have occurred.

         (n) APPRAISALS - The Agent shall have received appraisals on each
Company's Rigs, which appraisals shall be by an appraiser acceptable to the
Agent and shall indicate an Orderly Liquidation Value of not less than
$150,000,000 with respect to Rigs.

         (o) DELIVERY OF TITLES - Each Company shall deliver to the Agent the
original certificates of title issued by the department of transportation or
other corresponding instrumentality or agency of any State or jurisdiction which
relates to any Rig owned by each Company that is also classified by such State
or jurisdiction as a certificated vehicle, together with all such fees and
documentation necessary or desirable, under applicable law, to endorse on such
title and effectuate a first priority lien and security interest thereon in
favor of the Agent for the benefit of the Lenders.

         (p) THE AGENT COMMITMENT LETTER - Each Company and each Obligor shall
have fully complied, to the satisfaction of the Agent, with all of the terms and
conditions of the Agent Commitment Letter.

         (q) LEGAL RESTRAINTS/LITIGATION - At the date of execution of this
Agreement, there shall be no (x) litigation, investigation or proceeding
(judicial or administrative) pending or threatened against any Obligor or its
assets, by any agency, division or department of any county, city, state or
federal government arising out of this Agreement, (y) injunction, writ or
restraining order restraining or prohibiting the consummation of the financing
arrangements contemplated under this Agreement

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<PAGE>   33

or (z) to the best knowledge of the Obligors, suit, action, investigation or
proceeding (judicial or administrative) pending or threatened against any
Obligor or its assets, which, in the opinion of the Agent if adversely
determined would reasonably be expected to have a Material Adverse Effect.

         (r) DISBURSEMENT AUTHORIZATION - Each Company shall have delivered to
the Agent all information necessary for the Agent to issue wire transfer
instructions on behalf of each Company for the initial and subsequent loans
and/or advances to be made under this Agreement including, but not limited to,
disbursement authorizations in form acceptable to the Agent.

         (s) EXAMINATION AND VERIFICATION - The Agent shall have completed to
the satisfaction of the Agent an examination and verification of the Accounts,
Inventory, Equipment, books and records of each Obligor which examination shall
indicate that, after giving effect to all loans, advances and extensions of
credit to be made at closing, all of the Companies shall have an initial
additional Availability of $25,000,000, all as more fully required by the Agent
Commitment Letter. It is understood that such requirement contemplates that all
debts, obligations and payables are current.

         (t) DEPOSITORY ACCOUNTS - Each Company shall have established a system
of bank accounts with respect to the collection of Accounts and the deposit of
proceeds of Equipment as shall be requested and acceptable to the Agent in all
respects.

         (u) EXISTING REVOLVING CREDIT AGREEMENT - Each Obligor's existing
credit agreement with Mellon Bank, N.A. shall be (x) terminated, (y) all loans
and obligations of each Company and/or the Guarantors thereunder shall be paid
or satisfied in full utilizing the proceeds of the initial Revolving Loans to be
made under this Agreement and (z) all liens upon or security interests in favor
of in connection therewith shall be terminated, assigned to the Agent and/or
released upon such payment as specified by the Agent.

         (v) CERTAIN OTHER AGREEMENTS - A copy, certified by an executive
officer of the Parent as being true and complete, of each of the following: (i)
the limited partnership agreement of UTI and UTIMS certified by the general
partner thereof, (ii) in the case of SDC, a copy of the outstanding promissory
note and related merger documents, and (iii) in the case of the Obligors, the
note purchase agreements and related documents (including amendments thereto in
connection with the transactions contemplated by this Agreement) with
Canpartners Investments IV, LLC.

Upon the execution of this Agreement and the initial disbursement of loans
hereunder, all of the above Conditions Precedent shall have been deemed
satisfied except as each Company and the Agent shall otherwise agree herein or
in a separate writing.

SECTION 3. REVOLVING LOANS

         1. Upon the Agent's receipt of an executed Revolving Loan Promissory
Note, the Lenders agree, subject to the terms and conditions of this Agreement
from time to time, and within (x) the Availability and (y) the Line of Credit,
but subject to Lenders' right to make "overadvances", to make loans and advances
to the Companies on a revolving basis (i.e., subject to the limitations set
forth herein, each Company may borrow, repay and re-borrow Revolving Loans);
provided, however,

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<PAGE>   34

that the Lenders shall not be obligated to lend to any Restricted Subsidiary an
amount in excess of a sum equal to (1) the Restricted Subsidiary Borrowing Base
less (2) the aggregate amount of all loans thereto by any and all Obligors.
Subject to such limitations, the aggregate amount of such loans and advances
outstanding shall be up to the sum of: (a) outstanding Eligible Accounts
Receivable of the Companies multiplied by the Accounts Receivable Advance
Percentage, plus (b) the lesser of (i) Net Book Value multiplied by the
Equipment Advance Percentage or (ii) the aggregate value of Eligible Equipment
of the Companies multiplied by the Equipment Advance Percentage, minus (c) the
outstanding undrawn balance of Letters of Credit outstanding, and minus (d) the
Availability Reserves. Each request shall constitute, unless otherwise disclosed
in writing to the Agent and the Lenders a representation and warranty by each
Company that (i) after giving effect to the requested advance, no Default or
Event of Default has or will have occurred and be continuing, (ii) such
requested Revolving Loan is within the Line of Credit and Availability, and
(iii) the proceeds of such Revolving Loan shall be used (A) if the Revolving
Loan is an Acquisition Facility Loan, solely for Permitted Acquisitions, and (B)
if the Revolving Loan is not an Acquisition Facility Loan, for the purposes
permitted for such loans as set forth in Section 7, Paragraph 18(l). All
requests for loans and advances must be received by an officer of the Agent no
later than 1:00 p.m., New York time, on the day on which such loans and advances
are required and must designate the portion thereof which are Acquisition
Facility Loans and the portion thereof which are Revolving Loans other than
Acquisitions Facility Loans. Should the Agent for any reason honor requests for
advances in excess of the limitations set forth herein, such advances shall be
considered "overadvances" and shall be made in the Agent's sole discretion,
subject to any additional terms the Agent deems necessary.

         2. In furtherance of the continuing assignment and security interest in
the Companies Accounts, each such Company may, at its option (but in all cases
subject to Section 3, Paragraph 9 below) promptly after the creation of
Accounts, execute and deliver to the Agent in such form and manner as the Agent
may reasonably require, solely for the Agent's convenience in maintaining
records of collateral, such confirmatory schedules of Accounts as the Agent may
reasonably request, and such other appropriate reports designating, identifying
and describing the Accounts as the Agent may reasonably require. In addition,
each Company may, at its option (but in all cases subject to Section 3,
Paragraph 9 below) provide the Agent with copies of agreements with, or purchase
orders from, such Company's customers, and copies of invoices to customers,
proof of shipment or delivery and such other documentation and information
relating to said Accounts and other collateral as the Agent may reasonably
require. Failure to provide the Agent with any of the foregoing shall in no way
affect, diminish, modify or otherwise limit the security interests granted
herein. Each Company hereby authorizes the Agent to affix such Company's printed
name or rubber stamp signature on assignment schedules or invoices as the
equivalent of a manual signature by one of each Company's authorized officers or
agents.

         3. (a) The Obligors hereby jointly and severally represent and warrant
that: each Trade Account Receivable of each Company is based on an actual and
bona fide sale and delivery of goods or rendition of services to its customers,
made by such Company in the ordinary course of its business; Equipment and the
other goods, if any, being sold and the Trade Accounts Receivable created are
the exclusive property of such Company and are not and shall not be subject to
any lien, consignment arrangement, encumbrance, security interest or financing
statement whatsoever, other than the Permitted Liens; the invoices evidencing
such Trade Accounts Receivable are in the name

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<PAGE>   35

of such Company; and the customers of such Company have accepted the goods or
services, owe and are obligated to pay the full amounts stated in the invoices
according to their terms, without dispute, offset, defense, counterclaim or
contracts, except for disputes and other matters arising in the ordinary course
of business with respect to which such Company has complied with the
notification requirements of Paragraph 5 of this section;

                  (b) The Obligors confirm to the Agent that any and all taxes
or fees relating to each Company's business, sales, the Accounts or goods
relating thereto, are such Company's sole responsibility and that same will be
paid by such Company when due and that none of said taxes or fees represent a
lien on or claim against the Accounts. Each Company agrees to maintain such
books and records regarding Accounts as the Agent may reasonably require and
agrees that the books and records of each Company will reflect the Agent's
interest in the Accounts. All of the books and records of each Company will be
available to the Agent at normal business hours, including any records handled
or maintained for such Company by any other company or entity (including any
Guarantor); provided, however, that the inclusion of this provision is not
intended to waive the attorney-client privilege with respect to legal files in
the possession of counsel to the Obligors.

         4. Until the Agent has advised the Parent to the contrary after the
occurrence of a Triggering Event (as defined below), the Companies may and will
enforce, collect and receive all amounts owing on the Accounts for the Agent's
and Lenders' benefit and on their behalf, but at the Companies' expense; such
privilege shall terminate automatically upon the institution by or against any
Company of any proceeding under any bankruptcy or insolvency law or, at the
election of the Agent, upon the occurrence of any Triggering Event and until
such Triggering Event is waived in writing by the Agent or cured to the Agent's
satisfaction. Any checks, cash, notes or other instruments or property received
by a Company with respect to any Accounts or other proceeds of Collateral shall
be held by or on behalf of such Company in trust for the Agent for the benefit
of the Lenders, separate from such Company's own property and funds, and
immediately deposited to the special depository accounts in the Agent's name at
a depository institution designated by the Agent for such purposes (the
"DEPOSITORY ACCOUNTS"). Each such Depository Account shall be covered by a
tri-party blocked account agreement in form and substance acceptable to Agent
among such depository institution, Agent and each Company. Each such blocked
account agreement shall provide, among other things, that (i) all items of
payment deposited in such accounts and proceeds thereof deposited in the
applicable Depositary Account are held by such depositary institution as agent
or bailee-in-possession for Agent, (ii) the depositary institution executing
such agreement has no rights of setoff or recoupment or any other claim against
such account, as the case may be, other than for payment of its service fee and
other charges directly related to the administration of such account and for
returned checks or other items of payment, and (iii) following Agent giving
notice to such depositary institution to do so (which notice Agent agrees not to
give to such bank prior to the occurrence of a Triggering Event), such
depositary institution agrees to immediately forward all amounts received in the
applicable Depositary Account to Agent. From and after the occurrence of a
Triggering Event, no Obligor shall, or shall cause or permit any Subsidiary
thereof to, accumulate or maintain cash in disbursement or payroll accounts as
of any date of determination in excess of checks outstanding against such
accounts as of that date and amounts necessary to meet minimum balance
requirements. As used in this Agreement, "TRIGGERING EVENT" means: (A) an Event
of Default has occurred and is continuing or (B) the amount of Availability,
determined without regard

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<PAGE>   36

to the Excluded L/Cs, at any time is less than $15,000,000. All amounts received
by the Agent in payment of Accounts ("COLLECTIONS") will be credited to the
Companies' accounts on the Business Day of the Agent's receipt of "good funds"
at the Agent's bank account in New York, New York on the Business Day of receipt
if received no later than 1:00 p.m. (New York City time) or on the next
succeeding Business Day if received after 1:00 p.m. (New York City time). No
checks, drafts or other instrument received by the Agent shall constitute final
payment to the Agent unless and until such instruments have actually been
collected. If all Triggering Events which occur cease to continue for a period
of thirty (30) consecutive days, in the reasonable judgment of the Agent based
on relevant information provided by the Parent, then the Parent shall resume the
enforcement, collection and receipt of all amounts owing on Accounts pursuant to
the first sentence of this Paragraph 4, as was in effect prior to the occurrence
of such Triggering Events (except as otherwise provided in Section 10 of this
Agreement).

         5. The Parent agrees to notify the Agent promptly of any matters
materially affecting the value, enforceability or collectibility of any Account
and of all material customer disputes, offsets, defenses, counterclaims,
returns, rejections and all reclaimed or repossessed merchandise or goods. The
Parent agrees to issue credit memoranda promptly (with duplicates to the Agent
upon request after the occurrence of an Event of Default that is continuing)
upon accepting returns or granting allowances, and may continue to do so until
the Agent has notified the Parent that an Event of Default has occurred and is
continuing and that all future credits or allowances are to be made only after
the Agent's prior written approval. Upon the occurrence of an Event of Default
that is continuing and until such time as such Event of Default is no longer
continuing or is waived in writing by the Agent or cured to the Agent's
satisfaction and on notice from the Agent, each Company agrees that all
returned, reclaimed or repossessed merchandise or goods shall be set aside by
each Company, marked with the Agent's name and held by the Companies for the
Agent's account as owner and assignee.

         6. The Agent shall maintain a separate account on its books in Parent's
name (the "REVOLVING LOAN ACCOUNT") in which the Companies will be charged with
loans and advances made by the Agent to them or for their account, and with any
other Obligations, including any and all costs, expenses and reasonable
attorney's fees which the Agent may incur in connection with the exercise by or
for the Agent of any of the rights or powers herein conferred upon the Agent, or
in the prosecution or defense of any action or proceeding to enforce or protect
any rights of the Agent in connection with this Agreement or the Collateral
assigned hereunder, or any Obligations owing to the Agent and the Lenders by
each Company. The Companies will be credited with all amounts received by the
Agent and/or the Lenders from such Companies or from others for the Companies'
account, including, as above set forth, all amounts received by the Agent in
payment of assigned Accounts and such amounts will be applied to payment of the
Obligations. In no event shall prior recourse to any Accounts or other security
granted to or by such Companies be a prerequisite to the Agent's right to demand
payment of any Obligation from any Obligor. Further, it is understood that the
Agent and/or the Lenders shall have no obligation whatsoever to perform in any
respect any of any Company's contracts or obligations relating to the Accounts.

         7. After the end of each month, the Agent shall promptly send the
Parent a statement showing the accounting for the charges, loans, advances and
other transactions occurring between the Agent and the Companies during that
month. The monthly statements shall be deemed correct

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<PAGE>   37

and binding upon the Companies and shall constitute an account stated between
such Companies and the Agent unless the Agent receives a written statement of
the exceptions within thirty (30) days of the date of the monthly statement.

         8. In the event that the sum of (i) the outstanding balance of
Revolving Loans and (ii) outstanding balance of Letters of Credit exceeds (x)
the maximum amount thereof available under Sections 3 and 5 of this Agreement or
(y) the Line of Credit (herein the amount of any excess shall be referred to as
the "Excess"), such Excess shall be due and payable to the Agent for the benefit
of the Lenders immediately upon the Agent's demand therefor.

         9. Until such time as a Company provides the information required by
the Agent under Section 3, Paragraphs 2 above, such Company's Trade Accounts
Receivable shall not be included as Eligible Accounts Receivable for purposes of
calculating Availability. Notwithstanding the foregoing, such Company shall
provide monthly summaries of Accounts in form and substance reasonably
satisfactory to the Agent described in Section 7, Paragraph 8(b)(iii)(D) of this
Agreement.

SECTION 4. ACQUISITION FACILITY LOANS AND PERMITTED ACQUISITIONS

         1. Dollar Amount of Acquisition Facility Loans. UTI shall be permitted
to borrow Revolving Loans for the purpose of the Parent, UTI, or a wholly-owned
(except to the extent of Canadian Exchangeable Shares) subsidiary of UTI
consummating Permitted Acquisitions ("ACQUISITION FACILITY LOANS") subject to
the following conditions:

                  (a) (i) Following the making of such Revolving Loan and
consummation of the Permitted Acquisition, there is at least $15 million of
Availability (determined without regard to the Excluded L/C's) and no more than
an aggregate of $45 million of Revolving Loans outstanding, and (ii) until the
Obligors have invested in the aggregate $25 million in cash (whether cash on
hand or cash provided from Revolving Loans to consummate Permitted Acquisitions
pursuant to this Section 4) in Permitted Acquisitions that are Domestic
Acquisitions, the aggregate amount of Revolving Loans outstanding for the
purpose of consummating Canadian Acquisitions cannot exceed the sum of (A) $20
million plus (B) the amount of cash invested in Domestic Acquisitions (whether
cash on hand or cash provided from Revolving Loans); or

                  (b) UTI and the Parent received the Agent's prior written
approval, which approval shall be given or not given in the Agent's sole and
absolute discretion.

         2. Acquisition Request. In addition, an Obligor's ability to consummate
Permitted Acquisitions and UTI's ability to borrow Revolving Loans for the
purpose of consummating Permitted Acquisitions are subject to the Parent
providing to the Agent at least ten (10) Business Days (except as otherwise
stated below or the context otherwise requires) prior to the funding of the
Acquisition Facility Loan or the consummation of the Permitted Acquisition the
following:

                  (a) (i) in the case of (A) an acquisition of capital stock of
a Person or all or substantially all of the assets of a Person, the name of the
Person (the "TARGET") which is to be acquired or whose assets are to be
acquired, and (B) an acquisition of Rigs or Rig Accessories, the

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<PAGE>   38

name of the Person from whom the same are to be acquired; (ii) in the case of
(A) an acquisition of Capital Stock of a Person or all or substantially all of
the assets of a Person, a description of the nature of the Target's business,
and (B) an acquisition of Rigs or Rig Accessories, a description of the Rigs or
Rig Accessories to be acquired;

                  (b) copies of the current drafts of documentation as and when
prepared;

                  (c) copies of substantially final drafts of such documentation
at least one (1) Business Day prior to the earlier to occur of (i) the proposed
funding date of the Acquisition Facility Loan intended to effect the proposed
acquisition or (ii) the date such proposed acquisition is expected to be
consummated (the "ACQUISITION AGREEMENTS");

                  (d) a summary of the terms and conditions of the proposed
acquisition;

                  (e) a certificate of the chief financial officer or chief
executive officer of the Parent dated on or within two (2) days prior to the
earlier to occur of the proposed funding date of the Acquisition Facility Loan
or date such Permitted Acquisition is expected to be consummated certifying (i)
the total amount of cash that has been used for Permitted Acquisitions as of
that date in Canada and the United States, and (ii) that no Default or Event of
Default exists that is continuing or could reasonably be expected to occur as a
result of the proposed acquisition; and

                  (f) any other information the Agent may reasonably request
from time to time prior to such funding or date such Permitted Acquisition is
expected to be consummated that is available to such Obligor.

In addition, at least three (3) Business Days prior to the earlier to occur of
(x) the date that the proposed funding of the Acquisition Facility Loan or (y)
date such proposed acquisition is expected to be consummated, the Parent and UTI
must have been available to the Agent and the Lenders to answer questions
regarding the proposed acquisition and the documentation related thereto.

         3. Acquisition Criteria. In addition, the Obligor's ability to
consummate Permitted Acquisitions and UTI's ability to borrow Revolving Loans
for the purpose of consummating Permitted Acquisitions are subject to the Parent
providing the Agent with evidence of the following:

                  (a) Parent has completed due diligence on the Target and the
assets to be acquired, as the case may be, reasonably satisfactory to Parent,
including, without limitation, if applicable, a due diligence investigation as
to the compliance with all Environmental Laws by the Target and the assets to be
acquired;

                  (b) Target's material business activities are in a Qualified
Business;

                  (c) Unless the Agent otherwise consents, if the proposed
acquisition is an acquisition of the stock of a Target, the acquisition will be
structured so that the Target will become a direct or indirect
Substantially-Owned Subsidiary of UTI; provided that if more than 50% of the
consideration to be paid for the acquisition is comprised of the Parent's stock
the Target may become

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<PAGE>   39

a direct Subsidiary of Parent if reasonably required in order for the
transaction to qualify as a tax-free reorganization pursuant to Section 368 of
the Internal Revenue Code of 1986, as amended. If the proposed acquisition is an
acquisition of assets, the acquisition will be structured so that a direct
Substantially-Owned Subsidiary owned by UTI shall acquire the assets.

                  (d) If the proposed acquisition is a Canadian Acquisition:

                           (i)      the Target to be acquired or the acquisition
                                    company to be formed or existing for
                                    purposes of owning the assets to be acquired
                                    (each a "CANADIAN OPERATING COMPANY") shall
                                    become a direct or indirect wholly-owned
                                    subsidiary of UTI (except for Canadian
                                    Exchangeable Shares);

                           (ii)     66% of the Capital Stock of each Canadian
                                    Operating Company (except for Canadian
                                    Exchangeable Shares) shall be pledged to the
                                    Agent for the benefit of the Lenders (and
                                    constitutes a first priority, fully
                                    perfected lien and security interest on such
                                    stock); and

                           (iii)    Any funds advanced to the Canadian Operating
                                    Company or through a Canadian Finance
                                    Company for purposes of consummating the
                                    proposed acquisition shall qualify as
                                    Permitted Business Investments.

                  (e) Neither the Target nor its assets nor the acquired assets,
as the case may be, shall be subject to any contingent obligations (including
contingent obligations arising from any environmental liabilities),
environmental liabilities, unsatisfied judgments or any pending action, charge,
claim, demand, suit, proceeding, petition, governmental investigation or
arbitration that (A) the Agent reasonably determines could reasonably be
expected to have a Material Adverse Effect and (B) are not subject to
indemnification or adjustment to acquisition consideration (or taken into
account in the determination of acquisition consideration) or other remedy
reasonably satisfactory to the Agent.

                  (f) The Parent shall have provided to the Agent each of the
following to the extent that they are reasonably available to the Parent: (A)
copies of (x) the internally prepared financial statements of the Target, for
the twelve (12) month period prior to the closing of the proposed acquisition
for which financial statements are available and (y) audited or reviewed
financial statements to the extent they exist for the two (2) most recently
completed fiscal years of the Target, and (B) a pro forma financial projection
of the Parent and its Subsidiaries (including the Target) for the period
following the date of the consummation of the proposed acquisition through the
end of the next succeeding Fiscal Year which reflects compliance with the
financial covenants set forth in this Agreement.

         4. Acquisition Agreements. As soon as practicable following the earlier
to occur of the consummation of the proposed acquisition or the funding of the
Acquisition Facility Loans to be used for the proposed acquisition: (a) Agent
shall have received executed copies of the Acquisition Agreements relating to
the proposed acquisition and shall, in the ordinary course of business, have

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<PAGE>   40

forwarded copies thereof to the Lenders; (b) the Acquisition Agreements shall be
in full force and effect and no material term or condition thereof shall have
been amended, modified, or waived after the execution thereof (other than solely
to extend the date by which the proposed acquisition is required to occur)
except those for which prior written notice was provided to Agent; (c) none of
the parties to the Acquisition Agreements shall have failed to perform any
material obligation or covenant required by the Acquisition Agreement to be
performed or complied with by it on or before the date of the closing of the
proposed acquisition unless waived with the consent of the Agent; and (d) Agent
shall have received a certificate from the Company's chief executive officer or
chief financial officer to the effect set forth in clauses (a), (b) and, to his
knowledge, (c) above.

         5. Acquisition Loan Documents. (a) If the proposed acquisition is an
acquisition of the stock of a Domestic Person, then: (i) the Target shall, upon
consummation of such acquisition, become a "Company" for all purposes under the
Loan Documents and shall execute and deliver to Agent documentation reasonably
required by the Agent in connection therewith, including, without limitation,
documentation confirming that such Person is or will be a Company or a
Restricted Subsidiary under the Loan Documents and an agreement in writing (in
form and substance reasonably satisfactory to the Agent) providing for the
subordination of inter-company indebtedness to the Obligations owed to the Agent
and the Lenders; (ii) the Obligors shall execute and deliver to the Agent an
amendment to the relevant Loan Documents describing as collateral thereunder the
stock of the Person and other Collateral owned by such Person (together with
documents incident thereto); and (iii) the acquiring Obligor shall deliver to
the Agent the certificates representing the stock of such Person together with
undated stock powers duly executed in blank. If the proposed acquisition is an
acquisition of Domestic assets, UTI shall execute and deliver the Agent such
documentation requested by Agent to cause the property acquired to be subject to
a fully perfected lien and security interest in favor of Agent for the benefit
of the Lenders and for such lien to have priority over all other liens other
than Permitted Liens.

                  (b) If, after giving effect to a Permitted Acquisition, the
Availability is or would be less than $30,000,000, then the Parent shall notify
the Agent in writing, as soon as practicable (but in no event more than five (5)
Business Days) after closing of such Acquisition in the event that, (i) any
Obligor effected a Permitted Acquisition of the Capital Stock of a Domestic
Subsidiary, (ii) such Subsidiary is or could be determined by Agent to be
Financially Weakened, and (iii) such Subsidiary is a first tier Subsidiary of
the Parent. Such Subsidiary shall be a Restricted Subsidiary for thirty (30)
days after the Agent receives written notice unless otherwise provided by
operation of this Paragraph 5(b). Within thirty (30) days after the Agent
receives such written notice, the Agent shall notify the Parent if the Agent has
an Objection to such Subsidiary (or its successor) becoming an Obligor, in which
event such Subsidiary (or its successor) shall become and remain a Restricted
Subsidiary until such time as the Agent determines, in the Agent's reasonable
discretion, that it has no further Objection or such Subsidiary becomes a
Subsidiary of UTI. If the Agent fails to assert its Objection, in writing,
within such thirty (30) day period, such Subsidiary shall instead not become a
Restricted Subsidiary of UTI. Regardless of whether a Subsidiary is a Restricted
Subsidiary under this clause (b), however, such Subsidiary shall become a
"Company" on the closing of such transaction, and the Agent, the Lenders and the
Obligors shall execute all documents (as contemplated in Paragraph 5(a) above)
as may be reasonably required to make such Subsidiary a "Company" hereunder.
Parent shall cause each Domestic Subsidiary to become a participant in the
Parent's consolidated cash

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<PAGE>   41

management system, (A) in the event such Subsidiary never becomes a Restricted
Subsidiary, as soon as practicable but in no event later than twenty (20) months
after the acquisition of such Subsidiary, or (B) in the event the Subsidiary
becomes a Restricted Subsidiary, as soon as practicable following the date such
Subsidiary ceases to be considered a Restricted Subsidiary, but in no event
later than twenty (20) months after such date.

                  (c) If, after giving effect to Permitted Acquisition of the
Capital Stock of a Domestic Person, Availability exceeds $30,000,000, then such
Person (or its successors) shall, upon the closing of the Acquisition thereof,
become a "Company" for all purposes hereof, and the parties hereto shall execute
all such documents (as contemplated in Paragraph 5(a) above) as may be
reasonably required to effect such result, and such Subsidiary shall not be a
Restricted Subsidiary.

                  (d) Within thirty (30) days following the closing of each
Permitted Acquisition, the Parent shall provide the Agent for the benefit of the
Lenders with a complete certified copy or executed original of all Acquisition
documents, instruments and agreements executed and delivered in connection with
such Acquisition.

                  (e) Any Company that is a Restricted Subsidiary may not become
part of the Parent's consolidated cash management system without the prior
written approval of the Agent. Any Company that is not a Restricted Subsidiary
may become a member of the Parent's consolidated cash management system at any
time at the Parent's discretion.

SECTION 5. LETTERS OF CREDIT

         In order to assist the Companies in establishing or opening Letters of
Credit with an Issuing Bank to cover the purchase of inventory, equipment or
otherwise, each Company has requested the Agent in behalf of the Lenders to join
in the applications for such Letters of Credit, and/or guarantee payment or
performance of such Letters of Credit and any drafts or acceptances thereunder
through the issuance of the Letters of Credit Guaranty, thereby lending the
Agent's and Lenders' credit to the Company and the Agent and the Lenders have
agreed to do so. These arrangements shall be handled by the Agent subject to the
terms and conditions set forth below.

         1. Within the Line of Credit and the Availability, the Agent and the
Lenders shall assist the Companies in obtaining Letter(s) of Credit in an amount
not to exceed the available portion of the Letter of Credit Sub-Line in the
aggregate outstanding at any one time. The Agent's and Lenders' assistance for
amounts in excess of the limitation set forth herein shall at all times and in
all respects be in the Agent's sole discretion. It is understood that the form,
expiry date and purpose of each Letter of Credit must be acceptable to the Agent
in its reasonable business judgment. Any and all outstanding Letters of Credit
shall be treated as a Revolving Loan for Availability purposes. Notwithstanding
anything herein to the contrary, so long as an Event of Default shall have
occurred and be continuing, the Agent's and Lenders' assistance in connection
with the Letter of Credit Guaranty shall be in the Agent's sole discretion
unless such Event of Default is no longer continuing or cured to the Agent's
satisfaction or waived by the Agent in writing.

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<PAGE>   42

         2. The Agent shall have the right, without notice to any Company, to
charge such Company's Revolving Loan Account on the Agent's books with the
amount of any and all indebtedness, liability or obligation of any kind incurred
by the Agent under the Letters of Credit Guaranty at the earlier of (a) payment
by the Agent under the Letters of Credit Guaranty, or (b) so long as an Event of
Default shall have occurred and be continuing. Any amount charged to a Company's
Revolving Loan Account shall be deemed a Revolving Loan hereunder and shall
incur interest at the rate provided in Section 8, Paragraph 1 of this Agreement.

         3. The Obligors jointly and severally unconditionally indemnify the
Agent and the Lenders and hold the Agent and the Lenders harmless from any and
all loss, claim or liability incurred by the Agent and/or the Lenders arising
from any transactions or occurrences relating to Letters of Credit established
or opened for any Company's account, the collateral relating thereto and any
drafts or acceptances thereunder, and all Obligations thereunder, including any
such loss or claim due to any action taken by any Issuing Bank, other than for
any such loss, claim or liability arising solely out of the gross negligence or
willful misconduct by the Agent and/or the Lenders under the Letters of Credit
Guaranty. The Obligors further agree jointly and severally to hold the Agent and
the Lenders harmless from any errors or omission, negligence or misconduct by
the Issuing Bank. Such unconditional obligation of the Obligors to the Agent and
the Lenders hereunder shall not be modified or diminished for any reason or in
any manner whatsoever, other than as a result of the Agent's and/or the Lenders'
gross negligence or willful misconduct. The Obligors agree that any charges
incurred by the Agent and/or the Lenders for the account of the Companies by the
Issuing Bank shall be conclusive on the Agent and the Lenders and may be charged
in the manner determined by the Agent to the Revolving Loan Accounts of the
appropriate Companies.

         4. The Agent and/or the Lenders shall not be responsible for: the
existence, character, quality, quantity, condition, packing, value or delivery
of the goods purporting to be represented by any documents; any difference or
variation in the character, quality, quantity, condition, packing, value or
delivery of the goods from that expressed in the documents; the existence,
character, quality or value of services, related to such documents; the
validity, sufficiency or genuineness of any documents or of any endorsements
thereon, even if such documents should in fact prove to be in any or all
respects invalid, insufficient, fraudulent or forged; the time, place, manner or
order in which shipment is made; partial or incomplete shipment, or failure or
omission to ship any or all of the goods referred to in the Letters of Credit or
documents; any deviation from instructions; delay, default, or fraud by the
shipper and/or anyone else in connection with the Collateral or the shipping
thereof; or any breach of contract between the shipper or vendors and the
Company. Furthermore, without being limited by the foregoing, the Agent and/or
the Lenders shall not be responsible for any act or omission with respect to or
in connection with any Collateral.

         5. Any action authorized or permitted under this Agreement and taken by
the Agent and/or the Lenders, if taken in good faith, or any action taken by any
Issuing Bank, under or in connection with the Letters of Credit, the guarantees,
the drafts or acceptances, or the Collateral, shall be binding on the Obligors
and shall not put the Agent and/or the Lenders in any resulting liability to the
Obligors. In furtherance thereof, upon the occurrence of an Event of Default and
so long as the same is continuing, the Agent shall have the full right and
authority to clear and resolve any questions of noncompliance with documents, to
give any instructions as to acceptance or

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                                       39
<PAGE>   43

rejection of any documents or goods; to execute any and all steamship or airways
guaranties (and applications therefore), indemnities or delivery orders; to
grant any extensions of the maturity of, time of payment for, or time of
presentation of, any drafts, acceptances, or documents; and to agree to any
amendments, renewals, extensions, modifications, changes or cancellations of any
of the terms or conditions of any of the applications, Letters of Credit, drafts
or acceptances; all in the Agent's sole name, and the Issuing Bank shall be
entitled to comply with and honor any and all such documents or instruments
executed by or received solely from the Agent all without any notice to or any
consent from any Company.

         6. Without the Agent's express consent and endorsement in writing, each
Company agrees: (a) not to execute any and all applications for steamship or
airway guaranties, indemnities or delivery orders; to grant any extensions of
the maturity of, time of payment for, or time of presentation of, any drafts,
acceptances or documents; or to agree to any amendments, renewals, extensions,
modifications, changes or cancellations of any of the terms or conditions of any
of the applications, Letters of Credit, drafts or acceptances; and (b) after the
occurrence of an Event of Default and so long as the same is continuing, and
which is not waived by the Agent, not to (i) clear and resolve any questions of
non-compliance of documents, or (ii) give any instructions as to acceptances or
rejection of any documents or goods.

         7. Each Company agrees that any necessary import, export or other
licenses or certificates for the import or handling of the Collateral will have
been promptly procured; all foreign and Domestic governmental laws and
regulations in regard to the shipment and importation of the Collateral, or the
financing thereof will have been promptly and full complied with; and any
certificates in that regard that the Agent may at any time request will be
promptly furnished. In this connection, each Company warrants and represents
that all shipments made under any such Letters of Credit are in accordance with
the laws and regulations of the countries in which the shipments originate and
terminate, and are not prohibited by any such laws and regulations. Each Company
assumes all risk, liability and responsibility for, and agrees to pay and
discharge, all present and future local, state, federal or foreign taxes,
duties, or levies owed thereby in connection with the conduct of their
respective businesses, except to the extent subject to appropriate dispute
resolution proceedings and for which adequate reserves in accordance with GAAP
have been established. Any embargo, restriction, laws, customs or regulations of
any country, state, city, or other political subdivision, where the Collateral
is or may be located, or wherein payments are to be made, or wherein drafts may
be drawn, negotiated, accepted, or paid, shall be solely each Company's risk,
liability and responsibility.

         8. Upon any payments made to the Issuing Bank under the Letter of
Credit Guaranty the Agent for the benefit of the Lenders shall acquire by
subrogation, any rights, remedies, duties or obligations granted or undertaken
by the applicable Company to the Issuing Bank in any application for Letters of
Credit, any standing agreement relating to Letters of Credit or otherwise, all
of which shall be deemed to have been granted to the Agent for the benefit of
the Lenders and apply in all respects to the Agent for the benefit of the
Lenders and shall be in addition to any rights, remedies, duties or obligations
contained herein.

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<PAGE>   44

SECTION 6. COLLATERAL

         1. As security for the prompt payment in full of all loans and advances
made and to be made to each Company from time to time by the Agent and/or the
Lenders pursuant hereto, as well as to secure the payment in full of the other
Obligations, each Obligor hereby pledges and grants to the Agent for the benefit
of the Lenders a continuing general lien upon and security interest in all of
its (excluding Real Estate, automobiles owned by any Obligor and Intellectual
Property):

                  (a) present and hereafter acquired Inventory;

                  (b) present and hereafter acquired Equipment (including, but
         not limited to, Eligible Equipment and Rigs);

                  (c) present and future Accounts;

                  (d) present and future Documents of Title;

                  (e) present and future General Intangibles; and

                  (f) present and future Other Collateral;

together with all cash and non-cash proceeds and products of the foregoing.

         2. The security interests granted hereunder shall extend and attach to:

                  (a) All Collateral which is presently in existence and which
is owned by any Obligor or in which any Company has any interest, whether held
by such Obligor or others for its account, and, if any Collateral is Equipment,
whether such Obligor's interest in such Equipment is as owner or lessee or
conditional vendee;

                  (b) All Equipment whether the same constitutes personal
property or fixtures, including, but without limiting the generality of the
foregoing, all Rigs, dies, jigs, tools, benches, tables, accretions, component
parts thereof and additions thereto, as well as all accessories, motors, engines
and auxiliary parts used in connection with or attached to the Equipment;

                  (c) All Inventory, if any, and any portion thereof which may
be returned, rejected, reclaimed or repossessed by either the Agent or any
Obligor from such Obligor's customers, as well as to all supplies, goods,
incidentals, packaging materials, labels and any other items which contribute to
the finished goods or products manufactured or processed by such Company, or to
the sale, promotion or shipment thereof.

         3. Each Obligor agrees to safeguard, protect and hold all Inventory for
the Agent's account and make no disposition thereof except in the regular course
of the business of such Obligor and not otherwise prohibited herein. Until an
Event of Default has occurred that is continuing which has not been waived in
writing by the Agent and the Agent has given such Obligor notice to the

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<PAGE>   45

contrary, as provided for below, any Inventory may, to the extent applicable to
the Companies, be sold and shipped by each Company to its customers in the
ordinary course of such Company's business, on open account terms which do not
exceed one hundred twenty (120) days from shipment date or as otherwise provided
herein, provided that all proceeds of all sales (including cash, accounts
receivable, checks, notes, instruments for the payment of money and similar
proceeds) are forthwith transferred, endorsed, and turned over to the Agent for
the benefit of the Lenders or deposited in the Depository Accounts in accordance
with Section 3, Paragraph 4 of this Agreement. The Agent shall have the right to
withdraw this permission at any time upon the occurrence of an Event of Default
that is continuing so long as the same is continuing and until such time as such
Event of Default is waived or cured to the Agent's reasonable satisfaction, in
which event no further disposition shall be made of the Inventory by such
Company without the Agent's prior written approval. The proceeds of sales of
Inventory shall be deposited in the form received to the Depository Accounts.
Upon the sale, exchange, or other disposition of Inventory, as herein provided,
the security interest in such Company's Inventory provided for herein shall,
without break in continuity and without further formality or act, continue in,
and attach to, all proceeds, including any instruments for the payment of money,
accounts receivable, contract rights, documents of title, shipping documents,
chattel paper and all other cash and non-cash proceeds of such sale, exchange or
disposition. As to any such sale, exchange or other disposition, the Agent shall
have all of the rights of an unpaid seller, including stoppage in transit,
replevin, rescission and reclamation.

         4. The Companies agree, at their own cost and expense, to keep the
Equipment in as good and substantial repair and condition as the same is now or
at the time the lien and security interest granted herein shall attach thereto,
reasonable wear and tear excepted, making any and all repairs and replacements
when and where necessary, except where the Companies believe, in their
reasonable business judgment, that such repairs are not consistent with their
customary business practices. The Companies also agree that to safeguard and
protect the proceeds of any sales of Equipment such proceeds shall not be
commingled with such Companies other property, but shall be segregated, and
shall be deposited immediately by such Companies in the identical form received
by such Companies by deposit to the Depository Accounts. Upon the sale,
exchange, or other disposition of the Equipment, as herein provided, the
security interest provided for herein shall, without break in continuity and
without further formality or act, continue in, and attach to, all proceeds,
including any instruments for the payment of money, accounts receivable,
contract rights, documents of title, shipping documents, chattel paper and all
other cash and non-cash proceeds of such sales, exchange or disposition. As to
any such sale, exchange or other disposition, the Agent shall have all of the
rights of an unpaid seller, including stoppage in transit, replevin, rescission
and reclamation. Notwithstanding anything in this Agreement to the contrary, any
Obligor may from time to time sell, lease, exchange, assign, transfer or
otherwise dispose of (1) any Equipment (plus any drill pipe and other inventory
reasonably necessary or incident to the ongoing operation of such Rigs),
provided that, immediately following the consummation of such sale, lease,
exchange or other disposition, (a) the Obligors, taken as a whole, own at least
one hundred ten (110) Domestic Rigs upon which the Agent, for the benefit of the
Lenders, has a first priority lien and fully perfected security interest, and
(b) the Orderly Liquidation Value of the Domestic Rigs upon which the Agent, for
the benefit of the Lenders, has such first priority lien and fully perfected
security interest exceeds $150,000,000 in aggregate, and (c) in no event shall
the Obligors be permitted to sell, lease, exchange, assign or transfer an
aggregate number of Rigs in any Fiscal Year of Parent that exceeds

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<PAGE>   46

15% of the aggregate number of Rigs owned by the Obligors on the first day of
such Fiscal Year, or if the foregoing conditions are not or would not otherwise
be satisfied upon the consummation of such sale, lease, exchange or other
disposition, and (2) Equipment no longer needed in such Obligor's operations;
provided, however, that with respect to dispositions permitted in this clause
(2), (A) the greater of the Book Value or Fair Market Value of the Equipment so
disposed of does not exceed $5,000,000 in the aggregate in any Fiscal Year for
all of the Obligors in the aggregate, and (B) the proceeds of such sales or
dispositions are delivered to the Agent or deposited in the Depository Accounts
in accordance with the foregoing provisions of this paragraph; provided,
however, that the aforesaid rights shall automatically cease upon the occurrence
of an Event of Default that is continuing which is not waived in writing by the
Agent or cured within any applicable grace period.

         5. The rights and security interests granted to the Agent for the
benefit of the Lenders hereunder are to continue in full force and effect,
notwithstanding the termination of this Agreement or the fact that the account
maintained in the Companies names on the books of the Agent may from time to
time be temporarily in a credit position, until the final payment in full to the
Agent and the Lenders of all Obligations and the termination of this Agreement.
Any delay, or omission by the Agent and/or the Lenders to exercise any right
hereunder, shall not be deemed a waiver thereof, or be deemed a waiver of any
other right, unless such waiver be in writing and signed by the Agent. A waiver
on any one occasion shall not be construed as a bar to or waiver of any right or
remedy on any future occasion.

         6. To the extent that the Obligations are now or hereafter secured by
any assets or property other than the Collateral or by the guarantee,
endorsement, assets or property of any other person, then the Agent shall have
the right in its sole discretion to determine which rights, security, liens,
security interests or remedies the Agent shall at any time pursue, foreclose
upon, relinquish, subordinate, modify or take any other action with respect to,
without in any way modifying or affecting any of them, or any of the Agent's or
the Lenders' rights hereunder.

         7. Any reserves or balances to the credit of any Obligor and any other
property or assets of such Obligor in the possession of the Agent and/or the
Lenders may be held by the Agent as security for any Obligations and applied in
whole or partial satisfaction of such Obligations when due. The liens and
security interests granted herein and any other lien or security interest the
Agent may have in any other assets of such Obligors, shall secure payment and
performance of all now existing and future Obligations. The Agent may in its
discretion charge any or all of the Obligations to the Revolving Loan Account of
such Company when due.

         8. This Agreement and the obligation of each Company to perform all of
its covenants and obligations hereunder shall be further secured, at the Agent's
discretion, upon the occurrence of an Event of Default that is continuing, by
mortgage(s), deed(s) of trust or assignment(s) on the Real Estate which shall
not be recorded until the occurrence of an Event of Default that is continuing.
Upon the occurrence of an Event of Default that is continuing, the Obligors
shall promptly execute such mortgages, deeds of trust assignments and other
documents as shall be requested by the Agent with respect to Real Estate now
owned or hereafter acquired by each Company as the Agent and/or the Lenders
shall require to obtain a valid first lien thereon subject only to Permitted
Liens and those exceptions of title as set forth in future title insurance
policies that are satisfactory to the Agent.

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<PAGE>   47

         9. Upon and from time to time following the occurrence of an Event of
Default that is continuing, the Agent for the benefit of the Lenders may, in its
sole discretion, record such mortgage(s), deed(s) of trust or assignment(s) on
the Real Estate or real estate then existing or acquired after the date thereof.
Once recorded, such documents shall remain of record until all of the
Obligations are paid and discharged in full (notwithstanding any other provision
in any Loan Document).

         10. Each Obligor shall give to the Agent for the benefit of the
Lenders, and/or shall cause the appropriate party to give to the Agent for the
benefit of the Lenders, from time to time such pledge agreements or security
agreements with respect to General Intangibles, capital stock and other property
(other than (except as provided in this Agreement) with respect to such
automobiles and Intellectual Property) of such Obligor which is or may
constitute Collateral as the Agent shall require to obtain a valid first
priority and fully perfected security interest and liens thereon. This Agreement
and the obligation of each Company to perform all of its covenants and
obligations hereunder shall be further secured, upon the occurrence of an Event
of Default that is continuing, by a security interest in each Obligor's
automobiles and Intellectual Property, which shall not attach or be documented
or filed or recorded until the occurrence of an Event of Default that is
continuing. Upon the occurrence of an Event of Default that is continuing the
Obligors shall, at the Agent's request, promptly execute such assignments and
other documents and deliver such certificates of title as requested by the Agent
with respect to such automobiles and Intellectual Property now owned or
hereafter acquired by each Company as the Agent and/or the Lenders shall require
to obtain a valid first lien and fully perfected security interest thereon
subject only to Permitted Liens. Once recorded, such documents shall remain of
record until all of the Obligations are paid and discharged in full
(notwithstanding any other provision in any Loan Document).

         11. The provisions in this Section 6, Paragraph 11 and in Section 10,
Paragraph 4 of this Agreement apply to the Collateral including all proceeds
thereof at all times during which such Collateral or the proceeds thereof are
located in Louisiana or are otherwise subject to the application of Louisiana
law in any respect (the "LOUISIANA PLEDGED COLLATERAL").

                  (a) The parties hereto recognize and agree that at all times
during which portions of the Louisiana Pledged Collateral or the proceeds
thereof are located in the State of Louisiana or are otherwise subject to the
application of Louisiana law, the perfection and priority of the security
interest granted by Obligors to the Agent in such portions or proceeds of the
Louisiana Pledged Collateral hereunder and the exercise of remedies in
connection therewith shall be subject to the provisions of Chapter 9 of the
Louisiana Commercial Laws that are mandatorily applicable thereto
notwithstanding under Louisiana law, the choice of any other jurisdiction's laws
to govern such matters (La. R.S. Sections 10:9-101, et seq.) and all other
applicable provisions of Louisiana law.

                  (b) Contemporaneously with the execution of this Agreement,
each Obligor has completed and signed one or more appropriate Louisiana UCC-1
financing statements with regard to the Louisiana Pledged Collateral and the
proceeds thereof. Debtor authorizes Secured Party, at Debtor's expense, to file
multiple originals, or photocopies, carbon copies or facsimile copies of such
Louisiana UCC-1 financing statements with the appropriate filing officer or
officers in the State of

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       44
<PAGE>   48

Louisiana, pursuant to the provisions of Chapter 9 of the Louisiana Commercial
Laws (La. R.S. Sections 10:9-101, et. seq.).

                  (c) Debtor shall give the Agent thirty (30) days' notice prior
to any change in any Obligor's employer identification number made by the Agent
and shall give the Agent notice of any change in such Obligor's employer
identification number that is not made by such Obligor within thirty (30) days
after such change. In the event of any change whatsoever in an Obligor's
employer identification number, such Obligor will execute and file any new UCC-1
financing statements or any other documents that are necessary or desirable to
preserve and continue the Agent's security interest under this Agreement within
thirty (30) days after such change.

SECTION 7. REPRESENTATIONS, WARRANTIES AND COVENANTS

         1. Each Obligor hereby warrants and represents and/or covenants with
respect to itself and each other Obligor that each Obligor is Solvent. Each
Obligor further warrants and represents that Schedule 7(1) hereto correctly and
completely sets forth each Obligor's chief executive office and all of the
locations of all of each Obligor's locations of all Collateral; and except for
the Permitted Liens, the security interests granted herein constitute and shall
at all times constitute the first and only liens on the Collateral; that, except
for the Permitted Liens, each Obligor is or will be at the time additional
Collateral is acquired by it, the absolute owner of the Collateral with full
right to pledge, sell, consign, transfer and create a security interest therein,
free and clear of any and all claims or liens in favor of others; that each
Obligor will at its expense forever warrant and, at the Agent's request, defend
the same from any and all claims and demands of any other Person other than the
Permitted Liens; that no Obligor will grant, create or permit to exist, any lien
upon or security interest in the Collateral, or any proceeds thereof, in favor
of any other Person other than the holders of the Permitted Liens; and that the
Equipment does not comprise a part of the Inventory of each Company and that the
Equipment is and will only be used by each Company in its business and will not
be held for sale or lease, or removed from its premises, or otherwise disposed
of by each Company without the prior written approval of the Agent except as
otherwise expressly permitted in Section 6, Paragraph 4 of this Agreement and,
additionally, in the case of the Rigs, in the ordinary course of Business. Each
Obligor makes each representation and warranty made in favor of each
Subordinating Creditor in each agreement with respect to or evidencing
Subordinated Debt ("SUBORDINATED AGREEMENTS") as if the same were set forth at
length herein.

         2. Each Obligor agrees to maintain books and records pertaining to the
Collateral in such detail, form and scope as the Agent shall reasonably require.
Each Obligor agrees that the Agent or its agents may enter upon such Obligor's
premises at any time during normal business hours, and from time to time, for
the purpose of inspecting the Collateral, and any and all records pertaining
thereto. The Parent agrees to afford the Agent written notice, on the Agent's
request, of changes in the location of any item or items of tangible Collateral,
within thirty (30) days following such request. The Parent is required, in any
event, to notify the Agent of the relocation of any Rig to a location not
previously known to Agent at least once each sixty (60) days, on reports
customarily maintained or created in the ordinary course of business by the
Obligors. Each Obligor shall also advise the Agent promptly, in sufficient
detail, of any material adverse change relating to the type, quantity or quality
of the Collateral taken as a whole, ordinary wear and tear excepted or on the
security interests

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<PAGE>   49

granted to the Agent therein. Each Guarantor represents, warrants and covenants
that it does not own and shall own no Rigs or Rig Accessories.

         3. Each Obligor agrees to: execute and deliver to the Agent, from time
to time, solely for the Agent's convenience in maintaining a record of the
Collateral, such written statements, and schedules as the Agent may reasonably
require, designating, identifying or describing the Collateral pledged to the
Agent hereunder. Each Obligor's failure, however, to promptly give the Agent
such statements, or schedules shall not affect, diminish, modify or otherwise
limit the Agent's security interests in the Collateral.

         4. Each Obligor agrees to comply and to cause each Obligor to comply,
with the requirements of all state and federal laws in order to grant to the
Agent valid and fully perfected first priority security interests in the
Collateral, subject only to the Permitted Liens. The Agent is hereby authorized
by each Obligor to file any financing statements covering the Collateral whether
or not each Obligor's signature appears thereon. Each Obligor agrees to do
whatever the Agent may reasonably request, from time to time, consistent with
the Obligors' obligations hereunder by way of: filing notices of liens,
financing statements, amendments, renewals and continuations thereof; filing of
leases (or copies thereof) with appropriate governmental authorities (including,
without limitation, for the purposes of obtaining the benefits of 60 Oklahoma
Statutes Section 319 and similar laws); cooperating with the Agent's custodians;
keeping stock records; transferring proceeds of Collateral to the Depository
Accounts; and performing such further acts as the Agent may reasonably require
in order to effect the purposes of this Agreement and the other Loan Documents.

         5. If Real Estate becomes Collateral hereunder, the Companies agree to
maintain and to cause each other Obligor (as applicable) to maintain, casualty
insurance on its Real Estate under such policies of insurance, with such
insurance companies, in such reasonable amounts and covering such insurable
risks as are at all times consistent with industry practices and reasonably
satisfactory to the Agent. All policies covering such Real Estate shall be made
payable to the Agent for the benefit of the Lenders, in case of loss, under a
standard non-contributory "mortgagee", "lender" or "secured party" clause and
are to contain such other provisions as the Agent may reasonably require to
fully protect the Agent's interest in the Real Estate and to any payments to be
made under such policies; provided, however, that such rights under such
policies will be subject to the rights under such policies of any holders of
Permitted Liens holding claims senior to those of the Agent for the benefit of
the Lenders.

         6. Each Obligor agrees to pay, when due, all taxes, assessments, claims
and other charges (herein "TAXES") lawfully levied or assessed upon such Obligor
or the Collateral and if such taxes remain unpaid after the date fixed for the
payment thereof unless such taxes are being diligently contested in good faith
by such Obligor by appropriate proceedings or if any lien shall be claimed
thereunder and execution thereon is not effectively stayed by such proceeding
(a) for taxes due the United States of America or (b) which in the Agent's
opinion might create a valid obligation having priority over the liens granted
to the Agent herein, the Agent may, on each Obligor's behalf, pay such taxes,
and the amount thereof shall be an Obligation secured hereby and due to the
Agent on demand.

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<PAGE>   50

         7. Each Obligor: (a) agrees to comply with all acts, rules, regulations
and orders of any legislative, administrative or judicial body or official,
which the failure to comply with would have a material and adverse impact on the
Collateral taken as a whole, or any material part thereof, or on the operation
of such Obligor's business; provided that such Obligor may contest any acts,
rules, regulations, orders and directions of such bodies or officials in any
reasonable manner which will not, in the Agent's reasonable opinion, materially
and adversely effect the Agent's rights or priority in the Collateral; (b)
agrees to comply with all Environmental Laws as presently existing or as adopted
or amended in the future, applicable to the ownership and/or use of its property
and operation of its business, which the failure to comply with would have a
material and adverse impact on the Collateral, or any material part thereof, or
on the operation of the business of each Obligor. The Obligors hereby jointly
and severally indemnify the Agent and the Lenders and agrees to defend and hold
the Agent and the Lenders harmless from and against any and all loss, damage,
claim, liability, injury or expense which the Agent and/or the Lenders may
sustain or incur (other than as a result of actions of the Agent and/or the
Lenders) in connection with any claim or expense asserted against the Agent
and/or the Lenders as a result of any environmental pollution, Hazardous
Material or environmental clean-up of any Obligor's real property; or any claim
or expense which results from each Obligor's operations (including, but not
limited to, each Obligor's off-site disposal practices) and such Obligor further
agrees that this indemnification shall survive termination of this Agreement as
well as the payment of all Obligations or amounts payable hereunder. Each
Obligor shall be deemed not to have breached any provision of this Paragraph 7
if (i) the failure to comply with the requirements of this Paragraph 7 resulted
from good faith error or innocent omission, (ii) such Obligor promptly commences
and diligently pursues a cure of such breach and (iii) such failure is cured
within thirty (30) days following such Obligor's receipt of notice of such
failure.

         8. Until the termination of this Agreement and payment and satisfaction
of all Obligations due hereunder, the following periodic reporting shall be
required:

         (a) The Parent agrees that, unless the Agent shall have otherwise
consented in writing, Parent will furnish to the Agent and each Lender, within
ninety (90) days after the end of each Fiscal Year of Parent, an audited
Consolidated Balance Sheet and an unaudited Consolidating Balance Sheet as of
the close of such year, and statements of profit and loss, cash flow and
reconciliation of surplus of the Parent, of each Company and all of their
Subsidiaries of each for such year, in the case of an audited Consolidated
Balance Sheet of the Parent, audited by independent public accountants selected
by the Parent and satisfactory to the Agent; within sixty (60) days after the
end of each Fiscal Quarter a Consolidated Balance Sheet and Consolidating
Balance Sheet as of the end of such period and statements of profit and loss,
cash flow and surplus of the Parent and all Subsidiaries of each, certified by
an authorized financial or accounting officer of Parent; and from time to time,
such further information regarding the business affairs and financial condition
of the Parent, each Company and all of their Subsidiaries thereof as the Agent
may reasonably request, including, without limitation (i) the accountant's
management practice letter, and (ii) annual projections in form reasonably
satisfactory to the Agent. Each financial statement which Parent is required to
submit or cause to be submitted hereunder must be accompanied by an officer's
certificate, signed by the President, Vice President, Senior Vice President,
Chief Financial Officer, Controller, or Treasurer of the Parent, pursuant to
which any one such officer must certify that: (A) the financial statement(s)
fairly and accurately represent(s) the Parent's and each Company's financial
condition in all material respects

                                               UTI - LOAN AND SECURITY AGREEMENT

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<PAGE>   51

at the end of the particular accounting period, as well as the Parents notes and
such Company's operating results during such accounting period, subject to
year-end audit adjustments and the absence of footnotes which are substantially
the same in form, substance and economic effect as those contained in the most
recent audited financial statements delivered to the Agent prior to the Closing
Date; (B) during the particular accounting period: (x) there has been no Default
or Event of Default under this Agreement that is continuing; provided, however,
that if any such officer has knowledge that any such Default or Event of Default
that is continuing has occurred during such period, the existence of and a
detailed description of same shall be set forth in such officer's certificate;
and (y) neither any Company nor the Parent has received any notice of
cancellation with respect to its property insurance policies; and (C) the
exhibits attached to such financial statement(s) constitute detailed
calculations showing compliance with all financial covenants contained in this
Agreement.

         (b) (i) Within forty-five (45) days after the end of each fiscal month
of the Parent (sixty (60) days for each fiscal month which is the last month of
a fiscal quarter), (A) the consolidated balance sheet of the Parent and its
Subsidiaries as of the end of such fiscal month and the related consolidated
statements of income and a schedule showing aggregate Capital Expenditures and
the aggregate amount of depreciation, depletion and amortization expense and
accumulated depreciation for such fiscal month and for the elapsed portion of
the Fiscal Year ended with the last day of such fiscal month, all of which shall
be certified by the chief financial officer or other authorized executive
officer of the Parent, (B) together with a comparison for such period and year
to date to the projection prepared for the Agent pursuant to Paragraph 8(a)(ii)
above, and (C) a list and, on the Agent's request, a copy of the leases and
subleases to persons other than Obligors of Rigs and Rig Accessories, related
thereto (together with information in reasonable detail describing the terms of
each lease, the location of the Equipment and the name and address of the
parties thereto); subject to normal year-end audit adjustments and the absence
of footnotes which are substantially the same in form, substance and economic
effect as those contained in the most recent audited financial statements
delivered to the Agent prior to the Closing Date; and (ii) within fifteen (15)
days after the end of each fiscal month of the Parent, a report with information
in form and substance substantially similar to the form set forth on Schedule
7(8)(b)(ii) hereto, with such changes and modifications to the information and
form contained in such report as reasonably acceptable to the Agent, setting
forth no less than the following information calculated in good faith based upon
the then most current information: (a) total available days; (b) total operating
days; and rig counts (including the total rigs, stacked rigs, and marketable
rigs) in each case relative to the "Mid-Continent," Mexico, "West Texas/New
Mexico," "South Texas," "East Texas" and "Rockies" regions, as such counts
relate to crude oil drilling and natural gas and crude oil services; and (iii)
within forty-five (45) days after the end of each fiscal month of the Parent, a
report in form and substance reasonably satisfactory to the Agent which sets
forth a summary in reasonable detail of (A) all Permitted Acquisitions made
since the Closing Date to the end of the month first preceding the date of such
report, stating whether such acquisition was a Domestic Acquisition or a
Canadian Acquisition, the name of the Obligor which is the purchaser and the
name and address of the seller, (B) the type and amount of payments in cash
(consisting of Revolving Loans and/or other working capital of the Obligors),
Capital Stock of the Parent or other consideration paid for the assets or stock
purchased in such acquisitions, (C) a list of Rigs, if any, that may be
construed to be Mobile Rigs in which a security interest cannot be perfected by
filing a financing statement under the U.C.C.; and (D) subject to Section 3,
Paragraph 9 above, a report in the form of Schedule 7(8)(b)(iii) with
receivables aging of the Parent and its

                                               UTI - LOAN AND SECURITY AGREEMENT

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<PAGE>   52

Subsidiaries for the preceding month, all certified by the chief financial
officer or other executive officer of the Parent.

         9. Until termination of this Agreement and payment and satisfaction of
all Obligations due hereunder, each Company agrees that upon Agent's request,
each Company shall, at its expense, no more than once in any three (3) month
period, but at any time or times as Agent may request on or after an Event of
Default and so long as the same is continuing, deliver or cause to be delivered
to Agent written updated (as opposed to new) reports or appraisals (including
Appraisals of Orderly Liquidation Value) as to the Collateral in form, scope and
methodology acceptable to Agent and by an Approved Appraiser, addressed to Agent
and Lenders or upon which the Agent and Lenders are expressly permitted to rely.

         10. Until termination of this Agreement and payment and satisfaction of
all Obligations due hereunder, each Obligor agrees that, without the prior
written consent of the Agent, except as otherwise herein provided, it will not
and it will not permit any other Obligor to:

         A.       Mortgage or pledge any of its assets as security, or otherwise
                  permit any lien, charge, security interest (whether as a
                  result of a purchase money or title retention transaction, or
                  other security interest, other transaction intended as
                  security) to exist on any of its assets or goods, whether
                  real, personal or mixed, whether now owned or hereafter
                  acquired, except for the Permitted Liens;

         B.       Incur or create any Indebtedness for Borrowed Money other than
                  the Permitted Indebtedness;

         C.       Borrow any money on the security of the Collateral or on any
                  automobile or other vehicle owned by any Obligor, Real Estate
                  or Intellectual Property that is or may become Collateral from
                  sources other than the Agent and the Lenders (excluding
                  purchase money Permitted Indebtedness secured only by Purchase
                  Money Liens);

         D.       Sell, lease, assign, transfer or otherwise dispose of (i)
                  Collateral, except as otherwise specifically permitted by this
                  Agreement, or (ii) either all or substantially all of any
                  Obligor's assets which do not constitute Collateral; provided,
                  however, that as long as there has not occurred an Event of
                  Default that is continuing which has not been waived in
                  writing by the Agent and no Default or Event of Default would
                  occur or exist after giving effect thereto, this Section 7,
                  Paragraph 10D shall not prohibit:

                  (i)      any sale, lease assignment, transfer or other
                           disposition permitted under Section 6, Paragraph 4 of
                           this Agreement;

                  (ii)     (a) the sale, lease, assignment, transfer or other
                           disposition of Inventory in the ordinary course of
                           business, and (b) the lease of Rigs or other
                           Equipment in the ordinary course of business of the
                           Companies, provided that each such lease shall be
                           subordinate (in form and substance reasonably
                           satisfactory to the Agent) to the terms of the liens
                           and security interests created in connection

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                                       49
<PAGE>   53

                           herewith in favor of the Agent, the aggregate fair
                           market value of such Rigs and other Equipment so
                           leased to third parties not affiliated with any
                           Obligor does not exceed $5,000,000 in the aggregate
                           during the term of this Agreement and all such Rigs
                           and other Equipment so leased are disclosed to the
                           Agent in writing as such and are excluded from
                           Eligible Equipment;

                  (iii)    the sale, transfer or disposition approved by the
                           Board of Directors of the Parent to a Person that is
                           not an Obligor of (a) the capital stock or
                           substantially all of the assets of UWSI or IPSCO (so
                           long as such entities do not own any Rigs or Rig
                           Accessories), (b) UHRB's hard rock boring business or
                           assets or (c) all of the capital stock or
                           substantially all of the assets of any other Obligor
                           (other than UTI) that has Tangible Net Worth on a
                           consolidated basis for such Obligor and its
                           Subsidiaries of less than $10,000,000;

                  (iv)     the sale, lease, assignment, transfer or other
                           disposition of any or all of the assets of any
                           Obligor to any other Obligor to the extent that the
                           same qualifies as a Permitted Intercompany Balance,
                           except that no more than an aggregate of five (5)
                           Rigs may be leased at any one time to NDM and no Rigs
                           may be sold, transferred or leased to any Guarantor;

                  (v)      the sale, transfer or assignment by an Obligor to a
                           Canadian Finance Company of a loan or other amount
                           owed from a Canadian Operating Company to such
                           Obligor;

                  (vi)     any Obligor may license any Intellectual Property to
                           any other Obligor, and any Obligor may license any
                           Intellectual Property to a Person that is not
                           affiliated with an Obligor so long as the license of
                           such Intellectual Property does not materially
                           adversely affect the operation of any Obligors'
                           business; and

                  (viii)   the sale, transfer or other disposition of oil and
                           gas mineral interests (and related operating
                           agreements covering the operation of such interests).

         E.       Merge, consolidate or otherwise alter or modify its corporate
                  name, principal place of business, chief executive office,
                  structure, status or existence (other than the Designated
                  Mergers), or enter into or engage in any operation or activity
                  that is not a Qualified Business or is materially different
                  from that presently being conducted by the Obligors taken as a
                  whole, except that an Obligor may change its corporate name,
                  or principal place of business or address to a location within
                  the 48 contiguous states of the United States of America;
                  provided that (x) such Obligor shall give the Agent thirty
                  (30) days prior written notice thereof and (y) such Obligor
                  shall execute and deliver prior to or simultaneously with any
                  such action any and all documents and agreements requested by
                  the Agent (including, without limitation, any and all U.C.C.
                  financing statements) to confirm the continuation and
                  preservation of all security interests and liens granted to
                  the Agent for the benefit of the Lenders hereunder;

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       50
<PAGE>   54

                  provided, however, that as long as there has not occurred an
                  Event of Default that is continuing which has not been waived
                  in writing by the Agent and no Default or Event of Default
                  would occur or exist after giving effect thereto and such
                  Obligor has complied with clause (x) and clause (y)
                  immediately above, this Section 7, Paragraph 10E of this
                  Agreement shall not prohibit any of the following except to
                  the extent that the Agent reasonably determines, during the
                  thirty (30) day period following the Agent's receipt of the
                  notice referred to in clause (x) above and all executed
                  documents and Agreements requested as described in clause (y)
                  above, that the liabilities and other obligations (contingent
                  or otherwise) of any Obligor resulting therefrom or associated
                  therewith could reasonably be expected to have a Material
                  Adverse Effect or that the Person to be merged or consolidated
                  is Financially Weakened:

                  (i)      the merger or consolidation of any Subsidiary of the
                           Parent in existence on the date of this Agreement
                           into any one or more of the Companies in a
                           transaction in which a Company is the surviving
                           Person and no Person other than a Company receives
                           any consideration or if such consideration is paid to
                           others that are not Subsidiaries, if such payment
                           would be permitted to be made if it was made as a
                           Restricted Payment (and in such case such payment
                           shall constitute a Restricted Payment for all
                           purposes of this Agreement);

                  (ii)     upon the prior written consent of the Agent which
                           shall not be withheld unreasonably, the merger or
                           consolidation of any foreign Subsidiary of any of the
                           Companies with and into any of the Companies or any
                           Domestic Subsidiary of any of the Companies, in a
                           transaction in which no Person other than the Parent
                           or a Subsidiary of the Parent receives any
                           consideration (or if such consideration is paid to
                           others that are not Subsidiaries, if such payment
                           would be permitted to be made if it was made as a
                           Restricted Payment);

                  (iii)    upon the prior written consent of the Agent which
                           shall not be withheld unreasonably, the merger or
                           consolidation of any other Person with and into any
                           of the Companies if (a) all or substantially all of
                           the consideration given by any Company to consummate
                           the merger or consolidation consists of Qualified
                           Stock issued by the Parent, and (b) the applicable
                           Company is the surviving entity and after giving
                           effect to such merger or consolidation, the Companies
                           shall be in compliance, on a pro forma basis after
                           giving effect to such transaction, with all of the
                           covenants contained herein as of the first day of
                           each relevant period for testing such compliance (but
                           without regard to the financial covenants contained
                           in Section 7, Paragraph 11 of this Agreement if such
                           covenants do not then otherwise apply because minimum
                           Availability exceeds $15,000,000), and the Parent
                           shall have delivered to the Agent an officer's
                           certificate to that effect, together with all
                           relevant financial information and calculations
                           demonstrating such compliance; provided, however,
                           that the Agent's consent shall be required to be
                           given if the amount

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                                       51
<PAGE>   55

                           of Availability is more than $30,000,000 after giving
                           effect to the transaction; and

                  (iv)     without limitation of any of the other requirements
                           set forth in this Section 7, Paragraph 10, a Company
                           may not merge or consolidate any other Person that
                           has been acquired pursuant to a Permitted Acquisition
                           with and into any of the Companies or integrate such
                           Person's cash management systems with the cash
                           management systems of the other Companies without the
                           Agent's prior written consent, which shall not be
                           unreasonably withheld, unless the Availability both
                           before and after such merger or consolidation is
                           equal or greater than $30,000,000 and the Parent
                           shall have delivered to the Agent an officer's
                           certificate to that effect, together with all
                           relevant financial information and calculations
                           demonstrating such compliance.

         F.       Assume, guarantee, endorse, or otherwise become liable upon
                  the obligations of any Person, other than by the endorsement
                  of negotiable instruments for deposit or collection or similar
                  transactions in the ordinary course of business, except that
                  this Section 7, Paragraph 10F of this Agreement shall not
                  prohibit the assumption, guarantee or incurrence, of any
                  contingent obligation to the extent that such obligation, were
                  it considered Indebtedness, would be permitted to be incurred
                  under the other terms and provisions of Section 7, Paragraph
                  10B of this Agreement or otherwise constitute Permitted
                  Indebtedness;

         G.       Make any Restricted Payment; provided, however, that as long
                  as no Event of Default has occurred that is continuing which
                  has not been waived in writing by the Agent and no Default or
                  Event of Default would occur or exist after giving effect
                  thereto, this Section 7, Paragraph 10G of this Agreement shall
                  not prohibit:

                  (i)      any Restricted Payment by Parent payable solely in
                           shares of Capital Stock or warrants, rights or
                           options to acquire shares of stock of the Parent,
                           including, without limitation, any stock split or
                           stock dividend effected by the Parent;

                  (ii)     any Restricted Payment payable solely to one or more
                           of the Obligors, so long as such Restricted Payment
                           is a Permitted Intercompany Balance;

                  (iii)    any Restricted Payment if immediately after giving
                           effect to such Restricted Payment no Revolving Loans
                           are then outstanding or result therefrom and the
                           Companies have excess Availability of $15,000,000 or
                           more after giving effect thereto;

                  (iv)     any Restricted Payment if (1) immediately after
                           giving effect to such Restricted Payment the
                           Companies have excess Availability of $15,000,000 or
                           more and the Fixed Charge Coverage Ratio (after
                           giving effect to such Restricted Payment by including
                           it in the denominator of such ratio) for the twelve
                           month period ending on the date of the then most
                           recent consolidated financial

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                                       52
<PAGE>   56

                           statements of the Parent and its Subsidiaries
                           delivered (or required to be delivered) to the Agent
                           pursuant to Section 7, Paragraph 8, preceding the
                           date of such Restricted Payment is at least 1.2 to
                           1.0 and (2) the aggregate amount of all Restricted
                           Payments expended subsequent to the Closing Date (the
                           amount so expended, if other than in cash, to be
                           valued at its fair market value as determined by the
                           Board of Directors of the Parent) does not exceed the
                           sum of (a) $5,000,000, plus (b) 50% of the aggregate
                           consolidated net income of the Parent and its
                           Subsidiaries, determined in accordance with GAAP (or
                           if such consolidated net income shall be a loss,
                           minus 100% of such loss) during the period (treated
                           as one accounting period) subsequent to September 30,
                           1999, and ending on the last day of the fiscal
                           quarter immediately preceding the date of such
                           Restricted Payment, plus (c) 75% of the aggregate net
                           cash proceeds received by the Parent as a result of
                           the issuance of Qualified Stock of the Parent,
                           including any net proceeds received upon exercise of
                           any rights, options or warrants, other than in
                           connection with the conversion or exchange of any
                           Indebtedness or Disqualified Stock of the Parent;

                  (v)      the payment of any dividend by the Parent within
                           sixty (60) days after the date of its declaration if
                           at the date of declaration the payment would have
                           complied with this covenant;

                  (vi)     the purchase, redemption, acquisition or retirement
                           of any shares of Capital Stock of the Parent in
                           exchange for, or out of the net proceeds of the
                           substantially concurrent sale (other than to a
                           Subsidiary) of, other shares of Qualified Stock of
                           the Parent;

                  (vii)    purchases of common stock by the Parent or a trust
                           pursuant to a stock ownership or similar employee
                           benefit plan of the Parent or the cashless exercise
                           of stock options or warrants to purchase common stock
                           of the Parent by the Parent or a trust that in each
                           case has been approved by the Board of Directors of
                           the Parent;

                  (viii)   offsets in an amount not to exceed $5,000,000 in the
                           aggregate against and acquisitions of Capital Stock
                           of the Parent in satisfaction of indemnification and
                           other obligations owed to the Parent or its
                           Subsidiaries under acquisition arrangements in which
                           Capital Stock of the Parent is issued as
                           consideration for the acquisition; and

                  (ix)     the payment of dividends on the Parent's Preferred
                           Stock if and when issued pursuant to the Parent's
                           Stockholders Rights Plan with ChaseMellon Shareholder
                           Series LLC or its successor, provided that the
                           aggregate amount of all such dividends paid thereon
                           shall not exceed $50,000 per calendar quarter.

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                                       53
<PAGE>   57

         H.       Make any advance or loan to, or any investment in, any Person
                  or make any Acquisition; provided, however, that as long as
                  there has not occurred an Event of Default that is continuing
                  which has not been waived in writing by the Agent and no
                  Default or Event of Default would occur or exist after giving
                  effect thereto, this Section 7, Paragraph 10H shall not
                  prohibit:

                  (i)      any Obligor from having any Permitted Intercompany
                           Balances;

                  (ii)     any Obligor from making and owning any Permitted
                           Business Investments;

                  (iii)    any Obligor from making and owning any Permitted
                           Financial Investments;

                  (iv)     any Obligor from continuing to own loans, advances
                           and investments owned by it on the date hereof which
                           are set forth on Schedule 7.(10)(H)(iv), including,
                           without limitation, all investments in Subsidiaries,
                           partnerships and other Persons owned on the Closing
                           Date; provided that the respective amounts thereof do
                           not exceed the corresponding amounts thereof set
                           forth on Schedule 7.(10)(H)(iv).

                  (v)      any Obligor from making investments, loans and
                           advances permitted to be made under Section 7,
                           Paragraph 10(G) of this Agreement as a Restricted
                           Payment;

                  (vi)     any Obligor from incurring obligations permitted
                           under Section 7, Paragraph 10(F) of this Agreement;

                  (vii)    any Obligor from effecting a Permitted Acquisition in
                           accordance with the terms of this Agreement, provided
                           that after giving effect to such Permitted
                           Acquisition the Company has excess Availability
                           (determined as if the Excluded L/Cs were not
                           outstanding) of $15,000,000 or more;

                  (viii)   any Obligor from effecting a merger or consolidation
                           permitted under Section 7, Paragraph 10(E) of this
                           Agreement;

                  (ix)     the Parent or any Subsidiary thereof from making any
                           investment in any Person to the extent the
                           consideration paid consists of Qualified Stock of the
                           Parent;

                  (x)      the acquisition of Capital Stock or securities of any
                           Obligor by another Obligor if the acquiring Obligor
                           would be permitted to have the other Obligor merge
                           into it pursuant to Section 7, Paragraph 10(E) of
                           this Agreement;

                  (xi)     any note received as consideration for the sale or
                           disposition of UHRB's hard rock boring assets;
                           provided that the aggregate principal amount of such
                           note does not exceed $2,000,000; and

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       54
<PAGE>   58

                  (xii)    any other loans, advances or investments of in an
                           amount not to exceed $5,000,000 in the aggregate for
                           all Obligors at any one time outstanding.

         I.       Directly or indirectly conduct any business or enter into,
                  renew, extend or permit to exist any transaction (including
                  the purchase, sale, lease or exchange of any assets or the
                  rendering of any service) or series of related transactions
                  with any Affiliate of the Parent (other than a
                  Substantially-Owned Subsidiary or employee benefit plan or
                  plan trust (an "AFFILIATE TRANSACTION") on terms that are less
                  favorable to the Obligor party to such transaction, than would
                  be available in a comparable arm's length transaction with a
                  Person who is not an affiliate of the Parent, except for:

                  (i)      the payment of reasonable and customary regular fees
                           to directors of the Obligor who are not employees of
                           the Obligor;

                  (ii)     loans and advances to officers, directors and
                           employees of the Obligors or its Subsidiaries for
                           travel, entertainment and moving and other relocation
                           expenses made in direct furtherance and in the
                           ordinary course of business of the Obligor and its
                           Subsidiaries; provided, however, the aggregate
                           principal amount of loans and advances made pursuant
                           to this clause (ii) shall not exceed $1,000,000 at
                           any time outstanding;

                  (iii)    any other transaction with any employee, officer or
                           director of the Obligor or any of its Subsidiaries
                           pursuant to employee benefit or compensation
                           arrangements entered into in the ordinary course of
                           business and approved by the Board of Directors of
                           the Obligor or the Board of Directors of such
                           Subsidiary; provided, however, the aggregate
                           principal amount of loans and advances made pursuant
                           to this clause (iii) shall not exceed $1,000,000 at
                           any time outstanding;

                  (iv)     any transaction entered into in the ordinary course
                           of business with the Obligor or any Subsidiary of
                           Parent which is for inter-company charges for
                           administrative services, allocations of overhead,
                           concentrated cash management systems for collections
                           and disbursements, and sales of goods and services in
                           connection with the business of the Parent and its
                           Subsidiaries in the ordinary course of business of
                           such Persons;

                  (v)      licenses and other transfers of patents, trademarks,
                           trade names, copyrights, trade secrets, know-how and
                           other intellectual property between and among any two
                           or more of the Obligors and subsidiaries of the
                           Parent; and

                  (vi)     transactions between or among any of the Obligors and
                           any of the Subsidiaries of the Parent which qualify
                           as Permitted Intercompany Balances.

         J.       Without the prior written consent of the Agent,

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<PAGE>   59

                  (x)      amend or modify the Subordinated Debt (if any) in a
                           manner that materially affects the Lenders,

                  (y)      amend or modify any Subordination Agreement in a
                           manner that materially affects the Lenders, or

                  (z)      make any payment on the Subordinated Debt unless (A)
                           there has not occurred an Event of Default that is
                           continuing which has not been waived in writing by
                           the Agent and no Default or Event of Default would
                           occur and exist after giving effect thereto, (B) such
                           payment is permitted under the Subordination
                           Agreement, (C) after giving effect to such payment as
                           though it were a scheduled or required payment on the
                           Subordinated Debt (other than Subordinated Debt owing
                           to an Obligor) the Fixed Charge Coverage Ratio of the
                           Parent is not less than 1.0 to 1.0 for the twelve
                           month period ending on the date of the then most
                           recent consolidated financial statements of the
                           Parent and its Subsidiaries delivered (or required to
                           be delivered) to the Agent pursuant to Section 7,
                           Paragraph 8, preceding the date of such payment, and
                           (D) after giving effect to such payment, the amount
                           of the Availability would not be less than
                           $15,000,000 (in which case such payment shall not be
                           considered a Restricted Payment under this
                           Agreement); provided, however, if there has not
                           occurred an Event of Default that is continuing which
                           has not been waived in writing by the Agent, nothing
                           contained in paragraph (z) shall prohibit the making
                           of any payment on the Subordinated Debt at any time
                           with Qualified Capital Stock or the proceeds
                           therefrom or if the payment would be permitted as a
                           Restricted Payment (after giving effect to such
                           payment) under this Agreement.

         K.       Allow Canpartners Investments IV, LLC (and its affiliates) or
                  its successors or assigns or the Obligors, so long as the
                  Subordinated Debt thereof is outstanding, not to be subject to
                  an enforceable Subordination Agreement.

         11. Until termination of this Agreement and payment and satisfaction in
full of all Obligations hereunder, if any Event of Default shall occur and be
continuing which has not been waived in writing by the Agent or if the
Availability (determined as of the Excluded L/Cs were not outstanding) shall at
any time be less than $15,000,000, then the Obligors agree that the Parent will,
on a consolidated basis:

                  (a)      maintain as of the last day of each calendar month a
                           Tangible Net Worth of not less than $120,000,000; and

                  (b)      maintain as of the last day of each month TTM EBITDA
                           of not less than $12,000,000.

         12. [Intentionally Omitted]

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<PAGE>   60

         13. The Companies shall, jointly and severally, pay, indemnify, defend,
and hold the Agent, the Lender, and each of their respective officers,
directors, employees, counsel, agents, and attorneys-in-fact (each, an
"INDEMNIFIED PERSON") harmless (to the fullest extent permitted by law) from and
against any and all claims, demands, suits, actions, investigations,
proceedings, and damages, and all reasonable attorneys fees and disbursements
and other costs and expenses actually incurred in connection therewith (as and
when they are incurred and irrespective of whether suit is brought), at any time
asserted against, imposed upon, or incurred by any of them in connection with or
as a result of or related to the execution, delivery, enforcement, performance,
and administration of this Agreement and any other Loan Documents or the
transactions contemplated herein or therein, and with respect to any
investigation, litigation, or proceeding related to this Agreement, any other
Loan Document, or the use of the proceeds of the credit provided hereunder
(irrespective of whether any Indemnified Person is a party thereto), or any act,
omission, event or circumstance in any manner related thereto (all the
foregoing, collectively, the "INDEMNIFIED LIABILITIES"). Company shall have no
obligation to any Indemnified Person under this Paragraph 13 with respect to any
Indemnified Liability that a court of competent jurisdiction finally determines
to have resulted from the gross negligence or willful misconduct of such
Indemnified Person. This provision shall survive the termination of this
Agreement and the repayment of the other Obligations.

         14. Each Company agrees to advise the Agent in writing of: (a) all
expenditures (actual or anticipated) in excess of $500,000 for (i) environmental
clean-up, (ii) environmental compliance or (iii) environmental testing and the
impact of said expenses on the Working Capital of the Company; and (b) any
notices any Company receives from any local, state or federal authority advising
such Company of any material environmental liability (real or potential)
stemming from such Company's operations, its premises, its waste disposal
practices, or waste disposal sites used by such Company and to provide the Agent
with copies of all such notices if so required.

         15. [Intentionally Omitted]

         16. Each Obligor shall take all action reasonably necessary to assure
that its computer-based systems are able to effectively process date-sensitive
data functions. The Obligors jointly and severally represent and warrant that
the "Year 2000" problem (that is, the inability of certain computer applications
to recognize and properly perform date-sensitive functions involving certain
dates on or about or subsequent to December 31, 1999) will not result in a
material adverse effect on its business, assets or operations. Each Obligor
reasonably anticipates that all computer applications which are material to its
business will, on a timely basis, be able to properly perform date-sensitive
functions for all dates on and after January 1, 2000. Upon the Agent's request
from time to time, each Obligor shall provide to the Agent assurances that
Parent's and/or each Company's computer systems and software are or will be Year
2000 compliant on a timely basis, all in form and substance reasonably
satisfactory to the Agent.

         17. Agent may at any time and from time to time request a certificate
from an Executive Officer of each Obligor representing that all conditions
precedent to the making of Loans contained herein are satisfied. In the event of
such request by Agent, Lenders may, at their option, cease to make any further
Loans until Agent has received such certificate and, in addition, Agent has
determined that such conditions are satisfied.

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<PAGE>   61

         18. In order to induce the Lenders to enter into this Agreement and to
make the loans and advances provided for herein and to provide other credit
accommodations, each Obligor for itself and each of their respective
Subsidiaries jointly and severally make, on or as of the date hereof and on the
occurrence of each such loan or advance or other credit accommodation (except to
the extent such representations or warranties relate to an earlier date or are
no longer true and correct in all material respects solely as a result of
transactions not prohibited by the Loan Documents), the following
representations and warranties to the Agent and the Lenders:

                  (a) Organization and Qualification. Each Obligor (a) is duly
organized validly existing and in good standing under the laws of the
jurisdiction of its incorporation or organization, (b) has all requisite
corporate or partnership power to own its property and to carry on its business
as now conducted and (c) is duly qualified to do business and is in good
standing, in each case in each jurisdiction in which the failure to be so
qualified or in good standing would reasonably be expected to have a Material
Adverse Effect.

                  (b) Authorization and Validity. Each Obligor has all requisite
corporate or partnership power and authority to execute, deliver and perform its
obligations hereunder and under the other Loan Documents to which it is a party
and all such action has been duly authorized by all necessary corporate or
partnership proceedings on its part. The Loan Documents to which each corporate
Obligor is a party have been duly and validly executed and delivered by such
Obligor and constitute valid and legally binding agreements of such Obligor
enforceable in accordance with the respective terms thereof, except, in each
case, as such enforceability may be limited by applicable bankruptcy,
insolvency, reorganization, moratorium, fraudulent transfer or other similar
laws relating to or affecting the enforcement of creditors' rights generally and
general principles of equity.

                  (c) Consents. No authorization, consent, approval, license or
exemption (other than such exemptions that exist under applicable law, that are
permitted, or that have been obtained) of any Person or filing or registration
with any court or governmental department, commission, board, bureau, agency or
instrumentality, Domestic or foreign, is necessary for the valid, delivery or
performance by any Obligor of any Loan Document to which it is a party or for
the grant of a security interest in or mortgage on the collateral covered by the
Loan Documents, except such matters relating to performance as would ordinarily
be done in the ordinary course of business after the date hereof.

                  (d) Conflicting or Adverse Agreements or Ratifications. As of
the date hereof, Obligor is a party to any contract or agreement or subject to
any restriction which would reasonably be expected to have a Material Adverse
Effect. As of the date hereof, all agreements (other than this Agreement and the
other Loan Documents) of each Obligor relating to the lending of money or the
issuance of letters of credit to or for the account of any party are described
hereto on Schedule 7(18)(d). Neither the execution nor delivery by an Obligor of
the Loan Documents nor compliance with the terms and provisions hereof or
thereof will be contrary to the provisions of, or constitute a default under (i)
the charter or bylaws of any corporate Obligor, (ii) the Partnership agreement
or any Obligor that is a limited partnership, or (iii) any applicable law or any
applicable regulation, order, writ, injunction or decree of any court or
governmental instrumentality or (iv) any material agreement to which any Obligor
is a party or by which it is bound or to which it is subject,

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<PAGE>   62

other than such conflict or defaults which would not reasonably be expected to
have a Material Adverse Effect or violate any provision of the articles of
incorporation or bylaws of any of the Obligors.

                  (e) Title to Assets; Licenses and Permits. (i) Each Obligor
has good and marketable title to all of its Equipment, including, without
limitation, all Rigs, and other Eligible Equipment, and other personal property
and good and indefeasible title to or a subsisting leasehold interest in, all
realty as reflected as of the date hereof on its books and records as being
owned or leased by it after giving effect to the transaction contemplated
herein, subject to no Liens except Permitted Liens. All of the real property
owned or leased by any Obligor as of the date hereof is set forth on Schedule
7(18)(e)(i) hereto, with the applicable owner or lessee, location and real
property interest identified thereon. To the knowledge of each Obligor there are
no actual, threatened or alleged defaults of a material nature with respect to
any leases of real property under which any Obligor is bound after giving effect
to the transaction contemplated herein. After giving effect to the transaction
contemplated herein, each Obligor is current and in good standing with respect
to all governmental approvals, permits, certificates, licenses, consents and
franchises necessary to continue to conduct its business and to own or lease and
operate its properties as heretofore conducted, owned, leased or operated,
except where any such failure to maintain or file approvals, permits,
certificates, licenses, consents and franchises would not have a Material
Adverse Effect.

                           (ii) Since June 30, 1999, and as of the date hereof,
nothing has occurred that has had or could reasonably be expected to have a
Material Adverse Effect.

                           (iii) Except as fully reflected in the financial
statements described in Section 7(18)(g) and the Indebtedness incurred under
this Agreement, (i) there were as of the Closing Date (and after giving effect
to any loans made on such date), no liabilities or obligations (excluding
obligations or liabilities incurred in the ordinary course of business, which,
individually, or in the aggregate, could not reasonably be expected to have a
Material Adverse Effect) with respect to any Obligor or any of their
Subsidiaries of any nature whatsoever (whether absolute, accrued, contingent or
otherwise and whether or not due), and (ii) neither any Obligor nor any of its
Subsidiaries knows of any basis for the assertion against any Obligor or any of
its Subsidiaries of any such liability or obligation which, either individually
or in the aggregate, has, or could be reasonably likely to have, a Material
Adverse Effect.

                           (iv) Each of the Domestic Rigs (excluding certain
swab trucks and self-propelled service rigs with an Orderly Liquidation Value
not exceeding $1,500,000) are (a) goods which are mobile, of a type normally
used in more than one jurisdiction and not designed to be permanently used in
any one location; and (b) not fixtures under the laws of any jurisdiction in
which any of the Domestic Rigs is located. The Domestic Rigs are not "motor
vehicles" subject to Chapter 501 of the Transportation Code of the State of
Texas or any comparable statute, law, regulation or rule or any state in which
any of the Domestic Rigs is located and not certificated as motor vehicles under
that laws of any jurisdiction. Each self-propelled Mobile Rig in Texas has been
issued a permit license plate or machinery license plate in accordance with
Transportation Code Sections 502.276, 623.144 and 623.149 and is exempted from
(i) certification under Section 501 of the Transportation Code of the State of
Texas pursuant to Texas Department of Transportation Rules, Chapter 43, Section
17.3,

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<PAGE>   63

and (ii) registration under Section 502 of the Transportation Code of the State
of Texas. All of the Rigs (other than immaterial Rig Accessories) owned or
leased by any Obligor as of the date hereof are set forth on Schedule
7(18)(e)(iv) hereof; and such schedule contains the information (as of November
13, 1999) described in Section 7, Paragraph 8(b) of this Agreement.

                  (f) Litigation. Except as shown on Schedule 7(18)(f) as of the
date hereof, no proceedings against or affecting any Obligor are pending or, to
the knowledge of any Obligor, threatened before any court or governmental agency
or department which could reasonably be expected to have a Material Adverse
Effect.

                  (g) Financial Statements. Prior to the date hereof, the Parent
has furnished to the Lenders the audited financial statements of each Obligor as
of December 31, 1998 (such financial statements, collectively, are referred to
as "FINANCIALS"). The Financials have been prepared in conformity with GAAP
consistently applied and present fairly, in all material respects, the
consolidated financial condition of the respective Subsidiaries and Affiliates
of the Obligor as of the dates thereof. Since the date of the Parent's audited
financial statements most recently delivered to the Agent, there has not
occurred any event which would reasonably be expected have a Material Adverse
Effect. Each Obligor has delivered the Parent's internally prepared financial
projections on a consolidated basis for the 15 month period commencing on
October 1, 1999 (the "PROJECTIONS"). The Parent has delivered, as of the date
hereof, the Projections have been prepared in good faith and are based on what
each Obligor believes to be a reasonable assessment of the future performance of
the Parent and its Subsidiaries, on a consolidated basis, although there can be
no assurances that the results projected in the Projections will occur or that
actual results will not vary materially from the projected results.

                  (h) No Defaults. No Obligor is in default (i) under any
material provisions of any instrument evidencing any Indebtedness For Borrowed
Money or other Indebtedness with an outstanding balance in excess of $100,000 or
of any agreement relating thereto in such manner as to cause a Material Adverse
Effect or (ii) in any respect under or in violation of any order, writ,
injunction or decree of any court or governmental instrumentality, in such
manner as to cause a Material Adverse Effect or (iii) under any provision of any
material contract to which each Obligor or any of its Subsidiaries is a party,
which default would reasonably be expected to have a Material Adverse Effect.

                  (i) Investment Company Act. No Obligor is an "investment
company," as such term is defined in the Investment Company Act of 1940, as
amended.

                  (j) ERISA. (i) The Parent and each ERISA Affiliate have
operated and administered each Plan and Employee Plan in compliance with all
applicable laws except for such instances of noncompliance as have not resulted
in and would not reasonably be expected to have a Material Adverse Effect.
Neither the Parent nor any ERISA Affiliate has incurred any liability pursuant
to Title I or IV of ERISA or the penalty or excise tax provisions of the
Internal Revenue Code of 1986, as amended relating to employee benefit plans (as
defined in Section 3 of ERISA) which would individually or in the aggregate
reasonably be expected to have a Material Adverse Effect and no event,
transaction or condition has occurred or exists that would reasonably be

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<PAGE>   64

expected to result in the incurrence of any such liability by each Obligor or
any ERISA Affiliate, or in the imposition of any Lien on any of the rights,
properties or assets of the Parent or any ERISA Affiliate, in either case
pursuant to Title I or IV of ERISA or to such penalty or excise tax provisions
or to Section 401(a)(29) or 412 of the Internal Revenue Code of 1986, as
amended, other than such liabilities or liens as would not individually or in
the aggregate reasonably be expected to have a Material Adverse Effect;

                           (ii) No accumulated funding deficiency (as defined in
Section 412 of the Code or Section 302 of ERISA), whether or not waived, exists
or is expected to be incurred with respect to any Plan.

                           (iii) The Parent and its ERISA Affiliates have not
incurred withdrawal liabilities (and are not subject to contingent withdrawal
liabilities) under Section 4201 or 4204 of ERISA in respect of Multiemployer
Plans that individually or in the aggregate would reasonably be expected to have
a Material Adverse Effect.

                           (iv) The expected post-retirement benefit obligation
(determined as of the last day of the Parent's most recently ended fiscal year
in accordance with Financial Accounting Standards Board Statement No. 106,
without regard to liabilities attributable to continuation coverage mandated by
section 4980B of the Internal Revenue Code of 1986, as amended) of the Parent
and its Subsidiaries would not reasonably be expected to have a Material Adverse
Effect.

                  (k) Environmental Matters. Except as disclosed on Schedule
7(18)(k), each Obligor (a) possesses and will possess all environmental, health
and safety licenses, permits, authorizations, registrations, approvals and
similar rights necessary under Environmental Laws for the Obligors to conduct
their operations as now being conducted, except where failure to have such
licenses, permits, authorizations, registrations, approvals, and similar rights
would not reasonably be expected to have a Material Adverse Effect, and (b) each
of such licenses, permits, authorizations, registrations, approvals and similar
rights is, and will be, valid and subsisting, in full force and effect and
enforceable by the Obligors, and Obligors are, and will be, in compliance with
all terms, conditions or other provisions of such permits, authorizations,
regulations, approvals and similar rights except for such failure or
noncompliance that, individually or in the aggregate for Obligor and their
respective Subsidiaries, would not reasonably be expected to have a Material
Adverse Effect. Except as disclosed on Schedule 7(18)(k), no Obligor has
received any written notices of any violation or noncompliance with, or remedial
obligation under, any Environmental Laws (which violation, non-compliance, or
remedial obligation has not been cured or would not reasonably be expected to
have a Material Adverse Effect) and there are no writs, injunctions, decrees,
orders or judgments outstanding under the Environmental Laws, or lawsuits,
claims, proceedings, or, to the knowledge of any Obligor, investigations or
inquiries pending or threatened under Environmental Laws, relating to the
ownership, use, condition, maintenance or operation of, or conduct of business
related to, any property owned, leased or operated by any Obligor or other
assets of any Obligor other than those violations, instances of noncompliance,
obligations, writs, injunctions, decrees, orders, judgments, lawsuits, claims,
proceedings, investigations or inquiries that individually or in the aggregate
for each Obligor, would not reasonably be expected to have a Material Adverse
Effect. Except as disclosed on Schedule 7(18)(k), there are no obligations,
undertakings or liabilities arising

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<PAGE>   65

out of or relating to Environmental Laws which any Obligor has agreed to,
assumed or retained, or by which Obligors and their respective Subsidiaries are
adversely affected, by contract or otherwise, except such obligations,
undertakings or liabilities as would not reasonably be expected to have a
Material Adverse Effect. Except as disclosed on Schedule 7(18)(k), no Obligor
received a written notice or claim to the effect that any of them are or may be
liable to any other Person as the result of a release or threatened release (as
such term is used in its broadest sense) of a Hazardous Material except such
notice or claim that would not reasonably be expected to have a Material Adverse
Effect.

                  (l) Purpose of Loans. The proceeds of the Revolving Credit
Loans other than the Acquisition Facility Loans will be used by each Company to
refinance current debt, for working capital, and for repairs and ordinary
maintenance to the Company's Equipment (i.e., not for acquisitions of Rigs and
Rig Accessories and acquisitions of the capital stock or all or substantially
all of the assets of any Person, or for any other Capital Expenditures). The
proceeds of the Acquisition Facility Loans will be used by UTI for the purpose
of funding Permitted Acquisitions. None of the proceeds of any Advance will be
used directly or indirectly for the purpose of purchasing or carrying any
"margin stock" within the meaning of Regulation U (herein called "MARGIN STOCK")
or for the purpose of reducing or retiring any indebtedness which was originally
incurred to purchase or carry margin stock, or for any other purpose which might
constitute this transaction as a "purpose credit" within the meaning of
Regulation U. Neither the making of any Loan, nor the use of proceeds thereof,
violate Regulation U, Regulation X or any other regulation of the Board.

                  (m) Subsidiaries; Capital Stock. Except as disclosed on
Schedule 7(18)(m), on the date hereof or as disclosed in writing to the Agent,
no Obligor has any Subsidiaries or is a party to any joint venture, partnership
or similar organization. All of the issued and outstanding capital stock of
Parent's Subsidiaries is owned by Parent and its direct Subsidiaries. As of the
date hereof, the ownership of the capital stock of each Obligor is accurately
set forth on Schedule 7(18)(m) hereof;

                  (n) Insurance. Without limiting the provisions of Section 7,
Paragraph 5(a) above:

                           (i) Each Obligor will, and will cause each of its
         respective Subsidiaries to, at all times maintain in full force and
         effect insurance with reputable and solvent insurance carriers,
         covering such risks and liabilities and with such insured amounts,
         deductibles or self-insured retentions consistent with industry
         standards, and reasonably acceptable to Agent. Schedule 7(18)(n) sets
         forth a true and complete list of policies in effect covering each
         Obligor as of the Closing Date. The Obligors will, on each such later
         date as the Agent or the Required Lenders may reasonably request,
         furnish a summary of the insurance carried in respect of each Obligor
         and its Subsidiaries and the assets of each Obligor and its
         Subsidiaries together with original certificates of insurance, policies
         and other evidence of such insurance, if any, naming the Agent as an
         additional insured and/or loss payee as required pursuant to the next
         paragraph of this Paragraph 18(n), in form and substance reasonably
         satisfactory to the Agent.

                           (ii) Such insurance shall be provided by insurance
         companies licensed to do business in the applicable state of each
         Obligor's operations and shall be rated "A; VIII"

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<PAGE>   66

         or better by Best's Key Ratings Guide or as may be reasonably
         acceptable to the Agent if not so rated or licensed, and shall include
         the following insurance coverages and any other insurance coverages
         that may be required by applicable law:

                                    (A) Commercial General Liability insurance
                  written on an occurrence basis, including coverage for
                  premises, operations, products and completed operations,
                  explosion, collapse and underground, broad form commercial
                  general liability equivalent coverages with a minimum combined
                  single limit for bodily injury and property damage of
                  $1,000,000 per occurrence and $2,000,000 in the aggregate,
                  with a self-insured retention not greater than $100,000;

                                    (B) Business Automobile Liability insurance
                  covering all owned, non-owned and hired automobiles for a
                  combined bodily injury and property damage limit of no less
                  than $1,000,000 per occurrence and containing appropriate
                  no-fault insurance provisions required by law;

                                    (C) Workers' Compensation insurance in
                  amounts required by applicable law and employers liability
                  with limits of not less than $1,000,000;

                                    (D) umbrella (or excess form should umbrella
                  coverage be unavailable) liability coverage written on an
                  occurrence basis with a limit of liability of $50,000,000, and
                  also to include a "drop down" provision which will pick up any
                  exhaustion of limits under the primary coverages subject to a
                  retention of $25,000. Such insurance coverage shall provide
                  substantially identical coverages as are set forth in the form
                  of the insurance required in clauses (i), (ii)(A)/(B)/(C) and
                  (iii);

                                    (E) All-Risk Physical Loss or Damage
                  Property Insurance (including water damage, Domestic transit
                  coverage, collapse coverage, coverage of fire, flood and
                  earthquakes and rapid means of transportation coverages on an
                  agreed value basis) with respect to any Rig (on a
                  "no-coinsurance" basis) in an amount equal to or greater than
                  fifty percent (50%) of the Orderly Liquidation Value of each
                  Rig with a deductible not greater than $25,000 per occurrence;

                                    (F) Pollution Legal Liability Insurance with
                  limits of not less than $5,000,000 per occurrence; and

                                    (G) such other insurance policies and
                  coverages as the Agent may require.

                           (iii) All policies except Workers' Compensation shall
         insure the interests of the Agent and the Lenders (and their respective
         employees, agents, attorneys, representatives and officers) as
         additional insureds (each, an "ADDITIONAL INSURED") and the policies
         required by subclause (ii)(E) of this Paragraph 18(n) (in the nature of
         property damage insurance) shall provide for the direct payment of all
         proceeds to the Agent and UTI, as their interests may appear, which
         proceeds shall then be deposited to the Agent or, if so

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         directed in writing by the Agent, to the Depository Account. Each
         policy or certificate with respect to insurance of the Collateral shall
         be endorsed to the Agent's satisfaction for the benefit of the Agent
         (including, without limitation, by naming the Agent as loss payee, as
         its interests may appear, as required by the Agent) and such policy or
         certificate shall be delivered to the Agent. All policies required
         hereby shall provide for not less than thirty (30) days prior written
         notice to be received by the Agent and the Lenders of the termination
         or cancellation of the insurance evidenced thereby, unless such
         termination or cancellation is a result of non-payment of premiums in
         which case ten (10) days prior written notice shall be given to the
         Agent. Each Obligor agrees that, unless the insurance policies by their
         terms provide that they cannot cease (by reason of nonrenewal or
         otherwise) without the Agent being informed and having the option to
         continue the insurance by paying any premiums not paid by the Obligors,
         receipts showing payment of premiums for required insurance and also of
         demands from underwriters shall be in the hands of the Agent prior to
         the risk in question commencing. Prior to the expiration of any such
         policy of insurance, the appropriate Obligor shall deliver to the Agent
         an extension or renewal or replacement policy or an insurance
         certificate evidencing renewal, replacement or extension of such
         policy. If any such Obligor shall fail to insure such Collateral in
         accordance with this Paragraph (18)(n) or if any Obligor shall fail to
         so endorse and deposit, or to extend or renew, all such insurance
         policies or certificates with respect thereto, the Agent shall have the
         right (but shall be under no obligation) to advance funds to procure or
         renew or extend such insurance and each Company jointly and severally
         agrees to reimburse the Agent for all costs and expenses thereof, with
         interest on all such funds from the date advanced until paid in full at
         the highest rate then in effect under the Credit Agreement. The Agent
         agrees that it shall provide notice to the applicable Company that it
         has advanced funds on its behalf pursuant to this Paragraph 18(n). Each
         policy shall also provide:

                                    (A) that no Additional Insured shall have
                  any obligation or liability for premiums, commissions,
                  assessments or calls in connection with such insurance;

                                    (B) that the insurer thereunder waives all
                  rights of subrogation against all Obligors and the Additional
                  Insureds and any right of set-off or counterclaim and any
                  other right to deduction whether by attachment or otherwise;

                                    (C) that such insurance shall be primary
                  without right of contribution from any other insurance carried
                  by or on behalf of any Additional Insured;

                                    (D) with respect to liability insurance only
                  that, insofar as the policy is written to cover more than one
                  insured, all terms, conditions, insuring more than one
                  insured, all terms, conditions, insuring agreements and
                  endorsements, with the exception of limits of liability and
                  deductibles, shall operate in the same manner as if there were
                  a separate policy covering each insured;

                                    (E) that no Obligor will do or omit any act,
                  nor voluntarily suffer or permit any act to be done or
                  omitted, whereby the insurance required to be carried

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                                       64
<PAGE>   68

                  or maintained hereunder shall or may be suspended, impaired or
                  canceled, and no Obligor will use or operate, or permit the
                  Rigs to be used or operated for purposes more hazardous than
                  permitted by the terms of the insurance policies carried by
                  the Obligors pursuant to this Paragraph (18)(n) without first
                  notifying the Agent and having previously insured the Rigs by
                  additional coverage to extend to such uses, operations or
                  risks;

                                    (F) that such policies shall not contain any
                  date recognition exclusions; and

                                    (G) that such policies shall insure the
                  Additional Insureds regardless of any breach or violation of
                  the terms, conditions or warranties of such policies by any
                  Obligor.

                           (iv) The Companies shall deliver to each Additional
         Insured prior notice of any proposed insurance arrangement that the
         Obligors intend to put into effect which differs in any material
         respect (including terms of policies or identity of insurers or share
         of coverage to be provided by a particular insurer) from that which was
         previously in effect.

                           (v) Each Obligor will, at its own expense, make or
         cause to be made all proofs of loss and take, or cause to be taken, all
         other action necessary or appropriate to make collections from the
         underwriters of insurance required to be carried and maintained by this
         Paragraph 18(n) and report all claims and give all notices in a timely
         fashion with copies to the Agent.

                           (vi) Physical Damage Insurance proceeds paid to the
         Agent and UTI (with the proceeds to be deposited in the Depository
         Account) shall be applied to the repair or replacement of Collateral at
         such times and in such amounts as the Companies may require, except
         that after the occurrence of any Event of Default that is continuing,
         such proceeds shall, in their entirety, be held as cash Collateral
         and/or applied by the Agent in satisfaction of the Revolving Loans as
         it determines in its sole discretion.

                  (o) Indebtedness and Contingent Liabilities. Except as
disclosed in Schedule 7(18)(o) as of the date hereof, no Obligor has any
outstanding Indebtedness For Borrowed Money (excluding the loans and advances
hereunder) or material contractually assumed contingent liabilities.

                  (p) Security Interests. This Agreement and the other Loan
Documents create valid security interest and liens in all of the Collateral
described therein in favor of the Agent for the benefit of the Lenders securing
the Obligations and constitute (subject to (i) the filing of financing
statements and assignments of patents and trademarks delivered to the Agent on
the date hereof and thereafter from time to time and (ii) the delivery of any
collateral after the date hereof as provided herein or any other Loan Document)
perfected first priority liens and security interests in substantially all of
such Collateral described therein subject to no liens other than Permitted Liens
(other than titled

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equipment, rolling stock and patents, trademarks, copyrights and similar items
existing or issued outside of the United States).

SECTION 8. INTEREST, FEES AND EXPENSES

         1. (a) Interest on the Revolving Loans shall be payable monthly as of
the end of each month and shall be an amount equal to the lesser of (a) the sum
of (i) the Applicable Margin plus the Chase Bank Rate per annum on the average
of the net balances owing by each Company to the Agent and/or the Lenders in the
Company's Revolving Loan Account at the close of each day during such month on
balances other than LIBOR Loans, and (ii) the Applicable Margin, plus the
applicable LIBOR on any LIBOR Loan, on a per annum basis, on the average of the
net balances owing by the Company to the Agent and/or the Lenders as set forth
in the Company's Revolving Loan Account at the close of each day during such
month or (b) interest computed in accordance with the provisions of this clause
(a) but at the Maximum Legal Rate. The rates hereunder shall be calculated based
on a 360-day year. The Agent and the Lenders shall be entitled to charge the
Company's Revolving Loan Account at the rate provided for herein when due until
all Obligations have been paid in full.

                  (b) Notwithstanding any provision to the contrary contained in
this section in the event that the sum of the outstanding balance of (i)
Revolving Loans and Letters of Credit (but subject to Section 3, Paragraph 8
above) exceeds the lesser of (x) the maximum amount of Availability under
Sections 3 and 4 of this Agreement or (y) the Line of Credit: (A) as a result of
the sum of the Revolving Loans advanced or Letters of Credit arranged by the
Agent at the request of any Company (herein "REQUESTED OVERADVANCES"), for any
one (1) or more days in any month or months hereafter or (b) for any other
reason whatsoever (herein "OTHER OVERADVANCES") and such Other Overadvances
continue for five (5) or more consecutive days in any month hereafter, the
average net balance of all Revolving Loans owing by each Company to the Agent
and the Lenders for such month (or, if the fifth day occurs in a succeeding
month, then the net balances shall apply to the month in which the Overadvance
first occurred) shall bear interest at the Overadvance Rate. Upon and after the
occurrence and during the continuance of an Event of Default and the giving of
any required notice by the Agent in accordance with the provisions of Section
10, Paragraph 2 of this Agreement, but only for so long as such Event of Default
shall be continuing, all Obligations shall bear interest at the Default Rate of
Interest.

         2. Each Company may elect to use LIBOR as the basis for calculating the
interest rate to accrue on any other Revolving Loans, provided that (A) there is
then no Event of Default that is continuing, (B) such Company has so advised the
Agent of its election to use LIBOR and the LIBOR Period selected no later than
three (3) Business Days preceding the first day of a LIBOR Period and (C) the
election and LIBOR shall be effective, provided there is then no Event of
Default that is continuing, on the third Business Day following said notice. The
LIBOR elections must be for $1,000,000 or integer multiples thereof and there
shall be no more than five (5) LIBOR Loans outstanding at one time. If no such
election is timely made or can be made, or if the LIBOR rate can not be
determined, then the Agent shall use the Chase Bank Rate to compute interest. In
the event a Company requests any LIBOR election such Company shall pay to the
Agent a $500 processing fee upon the date hereof of each such LIBOR election
hereunder. In addition, such Company shall pay to the Agent for the benefit of
the Lenders, upon the request of the Agent such amount or

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amounts as shall compensate the Agent and/or the Lenders for any loss, costs or
expenses incurred by the Agent and/or the Lenders (as reasonably determined by
the Agent and the Lenders) as a result of: (i) any payment or prepayment on a
date other than the last day of a LIBOR Period for such LIBOR Loan, or (ii) any
failure of such Company to borrow a LIBOR Loan on the date for such borrowing
specified in the relevant notice; such compensation to include, without
limitation, an amount equal to any loss or expense suffered by the Agent and/or
the Lenders during the period from the date of receipt of such payment or
prepayment or the date of such failure to borrow to the last day of such LIBOR
Period if the rate of interest obtained by the Agent and/or the Lenders upon the
reemployment of an amount of funds equal to the amount of such payment,
prepayment or failure to borrow is less than the rate of interest applicable to
such LIBOR Loan for such LIBOR Period. The determination by the Agent and/or the
Lenders of the amount of any such loss or expense, when set forth in a written
notice to such Company, containing the Agent's and/or the Lenders' calculations
thereof in reasonable detail, shall be conclusive on such Company, in the
absence of manifest error. Calculation of all amounts payable to the Agent
and/or the Lenders under this paragraph with regard to LIBOR Loans shall be made
as though the Agent and the Lenders had actually funded the LIBOR Loans through
the purchase of deposits in the relevant market and currency, as the case may
be, bearing interest at the rate applicable to such LIBOR Loans in an amount
equal to the amount of the LIBOR Loans and having a maturity comparable to the
relevant interest period; provided, however, that the Agent and the Lenders may
obtain funds for each of the LIBOR Loans in any manner the Agent and the Lenders
see fit and the foregoing assumption shall be used only for calculation of
amounts payable under this paragraph. In addition, notwithstanding anything to
the contrary contained herein, the Agent and the Lenders shall apply all
proceeds of Collateral, including the Accounts, and all other amounts received
by it from or on behalf of the Companies (i) initially to the Chase Bank Rate
loans and (ii) subsequently to LIBOR Loans; provided, however, (x) and upon the
occurrence and during the continuation of an Event of Default or (y) in the
event the aggregate amount of outstanding LIBOR Rate Loans exceeds Availability
or the applicable maximum levels set forth therefor, the Agent and the Lenders
may apply all such amounts received by them to the payment of Obligations in
such manner and in such order as the Agent may elect in its reasonable business
judgment. In the event that any such amounts are applied to Revolving Loans
which are LIBOR Loans, such application shall be treated as a prepayment of such
loans and the Agent and the Lenders shall be entitled to indemnification
hereunder.

         3. In consideration of the Letter of Credit Guaranty of the Agent, the
Company shall pay the Agent for the benefit of the Lenders the Letter of Credit
Guaranty Fee which shall be an amount equal to one and one-quarter percent
(1.25%) per annum, payable monthly, on the face amount of each Letter of Credit
less the amount of any and all amounts previously drawn under the Letter of
Credit.

         4. Any charges, fees, commissions, costs and expenses charged to the
Agent and/or the Lenders for a Company's account by any Issuing Bank in
connection with or arising out of Letters of Credit issued pursuant to this
Agreement or out of transactions relating thereto will be charged to the
applicable Company's account in full when charged to or paid by the Agent and
when made by any such Issuing Bank shall be conclusive on the Agent.

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<PAGE>   71

         5. The Companies shall reimburse or pay the Agent for: (a) all
Out-of-Pocket Expenses and (b) any applicable Documentation Fee.

         6. Upon the last Business Day of each month, commencing with the last
day of the month in which this Agreement is executed the Companies shall pay the
Agent for the benefit of the Lenders the Line of Credit Fee.

         7. To induce the Agent and the Lenders to enter into this Agreement and
to extend to each Company the Revolving Loan, the Companies shall pay to the
Agent for the sole and separate account of the Agent a Loan Facility Fee in the
amount of $650,000 upon or prior to the execution of this Agreement which shall
be allocated by the Agent in its sole discretion.

         8. Upon the date hereof and on such annual anniversary hereof the
Companies shall pay to the Agent for the sole and separate account of the Agent
the Administrative Management Fee, which shall be fully earned and not
refundable or rebateable when due.

         9. [Intentionally Omitted]

         10. [Intentionally Omitted]

         11. Each Company shall pay the Agent's standard charges for, and the
fees and expenses of, the Agent's personnel used by the Agent for reviewing the
books and records of such Company and for verifying, testing, protecting,
safeguarding, preserving or disposing of all or any part of the Collateral;
provided, however, that the foregoing (other than Out-of-Pocket Expenses) shall
not be payable until the occurrence and during the continuation of an Event of
Default which has not been waived in writing by the Agent if the Companies are
paying an Administrative Management Fee.

         12. In no event shall the rates of interest hereunder exceed the
Maximum Legal Rate. In the event that the Contract Rate computed under this
section would exceed the Maximum Legal Rate, the rates of interest under this
Agreement for any such period shall be limited to the Maximum Legal Rate, but
any subsequent reductions in the Contract Rate shall not reduce the rates of
interest under this Agreement below the Maximum Legal Rate until the total
amount of interest charged hereunder equals the amount of interest that would
have been charged had the Contract Rate been charged at all times.

         13. Each Company hereby authorizes the Agent to charge the Revolving
Loan Account with the Agent with the amount of all payments due hereunder, and
under the other Loan Documents as such payments become due. Each Company
confirms that any charges which the Agent may so make to each Company's account
as herein provided will be made as an accommodation to each Company and solely
at the Agent's discretion.

SECTION 9. POWERS

         Each Obligor hereby constitutes the Agent on behalf of the Lenders or
any person or agent the Agent may designate as its attorney-in-fact, at such
Obligor's cost and expense, to exercise all

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<PAGE>   72

of the following powers, which being coupled with an interest, shall be
irrevocable until all of the Obligations to the Agent and the Lenders have been
paid in full:

         (a) To receive, take, endorse, sign, assign and deliver, all in the
name of the Agent or such Obligor, any and all checks, notes, drafts, and other
documents or instruments relating to the Collateral;

         (b) To receive, open and dispose of all mail addressed to such Obligor
and to notify postal authorities to change the address for delivery thereof to
such address as the Agent may designate;

         (c) To request from customers indebted on Accounts at any time, in the
name of the Agent or such Obligor or that of the Agent's designee, information
concerning the amounts owing on the Accounts;

         (d) To transmit to customers indebted on Accounts notice of the Agent's
interest therein and to notify customers indebted on Accounts to make payment
directly to the Agent for such Obligor's account; and

         (e) To take or bring, in the name of the Agent or such Obligor, all
steps, actions, suits or proceedings deemed by the Agent necessary or desirable
to enforce or effect collection of the Accounts .

         Notwithstanding anything hereinabove contained to the contrary, the
powers set forth in Paragraphs (a), (b), (d) and (e) above may only be exercised
after the occurrence of and during the continuation of an Event of Default and
until such time as such Event of Default that is continuing is waived in writing
by the Agent or cured to the Agent's satisfaction. In addition, the powers set
forth in Paragraph (c) above will only be exercised in the name of applicable
Obligor or a certified public accountant designated by the Agent prior to the
occurrence of such Event of Default that is continuing.

SECTION 10. EVENTS OF DEFAULT AND REMEDIES

         1. Notwithstanding anything hereinabove to the contrary, the Lenders
acting through the Agent may terminate this Agreement immediately upon the
occurrence and during the continuance of any of the following (herein "EVENTS OF
DEFAULT"):

         (a) cessation of the business of any other Obligor or the calling of a
meeting of the creditors of any other Obligor for purposes of compromising the
debts and obligations any Obligor;

         (b) the failure of any Obligor to generally meet debts as they mature;

         (c) the commencement by or against any Obligor of any bankruptcy,
insolvency, arrangement, reorganization, receivership or similar proceedings
under any federal or state law, provided that in the event of any involuntary
proceeding commenced against any Obligor such proceeding is not dismissed or
discharged within sixty (60) days after commencement thereof;

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<PAGE>   73

         (d) breach by any Obligor of any warranty, representation or covenant
contained herein (other than those referred to in Paragraph (e) below) or in any
other Loan Document, provided that such breach of any of the warranties,
representations or covenants referred in this Paragraph (d) shall not be deemed
to be an Event of Default unless and until such breach shall remain unremedied
to the Agent's satisfaction for a period of ten (10) Business Days after the
occurrence thereof;

         (e) breach by any Obligor of any warranty, representation or covenant
of Section 3, Paragraph 3 (other than the second sentence of Paragraph 3(b)) and
Paragraph 4 of this Agreement; Section 4, Paragraphs 3 and Paragraph 4 (other
than the first sentence of Paragraph 4) of this Agreement; or Section 7,
Paragraphs 1, 5, 6, and 10, 11 and 13 of this Agreement;

         (f) failure of any Company to pay any of the Obligations within five
(5) Business Days of the due date thereof, provided that nothing contained
herein shall prohibit the Agent from charging such amounts to the Revolving Loan
Account on the due date thereof;

         (g) any Obligor shall (i) engage in any "prohibited transaction" as
defined in ERISA, (ii) have any "accumulated funding deficiency" as defined in
ERISA, (iii) have any Reportable Event, (iv) terminate any Plan or (v) be
engaged in any proceeding in which the Pension Benefit Guaranty Corporation
shall seek appointment, or is appointed, as trustee or administrator of any
Plan, and with respect to this Paragraph (g) such event or condition (x) remains
uncured for a period of thirty (30) days from date of occurrence and (y) could,
in the reasonable opinion of the Agent, subject any Obligor to any tax, penalty
or other liability that could have a Material Adverse Effect.

         (h) the occurrence of any default or event of default (after giving
effect to any applicable grace or cure periods) under any instrument or
agreement evidencing (x) Subordinated Debt or (y) any other Indebtedness For
Borrowed Money of any Company having a principal amount in excess of $1,000,000;

         (i) any "person" or "group" (within the meaning of Sections 13(d) and
14(d)(2) of the Securities Exchange Act of 1934) becomes the "beneficial owner"
(as defined in Rule 13d-3 under the Securities Exchange Act of 1934), directly
or indirectly, of more than 30% of the total voting power of all classes of
stock then outstanding of Parent entitled to vote in the election of directors;
or

         (j) the occurrence of any default or event of default under any other
Loan Document.

         For purposes of this Agreement and the other Loan Documents, in the
event of (x) a misstatement, or misrepresentation with respect to any matter
that reasonably could be considered material to a commercial lender (including,
without limitation, any negligent or intentional misstatement or
misrepresentation in a certificate or other document delivered by an Obligor
pursuant to this Agreement) or (y) any breach or violation of any covenant
contained in any Loan Document by any Obligor arising from or relating to the
failure or delay in delivering to the Agent or depositing into a Depository
Account any Collections or other proceeds of Collateral or other funds which are
required to be so delivered or deposited pursuant to any Loan Document
(including, without limitation, the diversion, misdirection, misuse or
misapplication of any such Collections, proceeds or

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funds), that constitutes an Event of Default, such Event of Default shall be
considered continuing until such times as it is waived in writing by the Agent.

         2. Upon the occurrence and during the continuation of an Event of
Default, the Agent may (at its option), and shall at the direction of the
Required Lenders, declare that all loans, advances and extensions of credit
provided for in Section 3 of this Agreement shall thereafter be in the Agent's
sole discretion and the obligation of the Agent and/or the Lenders to make
Revolving Loans and/or open Letters of Credit shall cease unless such Event of
Default is waived in writing by the Agent on behalf of the Lenders or cured to
the Agent's satisfaction, and so long as an Event of Default shall have occurred
and be continuing the Agent may (at its option), and shall at the direction of
the Required Lenders declare that: (i) all Obligations shall become immediately
due and payable; (ii) the Default Rate of Interest shall be charged on all then
outstanding or thereafter incurred Obligations in lieu of the interest provided
for in Section 8 of this Agreement; provided that with respect to this clause
(ii), (a) the Agent has given the Parent written notice of the Event of Default;
provided, further that no notice is required if the Event of Default is the
event listed in Paragraph 1(c) of this section, and (b) the Default Rate shall
accrue from and after the date of the occurrence of the Event of Default listed
in Paragraph 1(c) of this section; and (iii) this Agreement shall immediately
terminate upon notice to the Parent; provided, however, that no notice of
termination is required if the Event of Default is the event listed in Paragraph
1(c) of this section. The exercise of any remedy available to the Agent and/or
the Lender is not exclusive of any other remedy available to the Agent and/or
the Lender, which may be exercised at any time by the Agent and/or the Lenders.

         3. Immediately upon the occurrence of any Event of Default and during
the continuation thereof which has not been waived in writing by the Agent, the
Agent may and, at the direction of the Required Lenders, shall to the extent
permitted by law: (a) remove from any premises where same may be located any and
all documents, instruments, files and records, and any receptacles or cabinets
containing same, relating to the Accounts, or the Agent may use, at the expense
of the Obligors, such of each Obligor's personnel, supplies or space at each
Obligor's places of business or otherwise, including UTIMS, as may be necessary
to properly administer and control the Accounts or the handling of collections
and realizations thereon; (b) bring suit, in the name of any Obligor or all
Obligors, or the Agent on behalf of the Lenders, and generally shall have all
other rights respecting said Accounts, including, without limitation, the right
to: accelerate or extend the time of payment, settle, compromise, release in
whole or in part any amounts owing on any Accounts and issue credits in the name
of each Obligor or the Agent; (c) sell, assign and deliver the Collateral and
any returned, reclaimed or repossessed merchandise, with or without
advertisement, at public or private sale, for cash, on credit or otherwise, at
the Agent's sole option and discretion, and the Agent may bid or become a
purchaser at any such sale, free from any right of redemption, which right is
hereby expressly waived by each Obligor; (d) foreclose the security interests in
the Collateral created herein by any available judicial procedure, or to take
possession of any or all of the Inventory, Equipment and/or Other Collateral
without judicial process, and to enter any premises where any Inventory,
Equipment and/or Other Collateral may be located for the purpose of taking
possession of or removing the same; and (e) exercise any other rights and
remedies provided in law, in equity, by contract or otherwise. The Agent shall
have the right to sell, lease, or otherwise dispose of all or any part of the
Collateral with reasonable notice, if any, as required by law, whether in its
then condition or after further preparation or processing, in the name of the
applicable Obligor or the Agent, or in

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<PAGE>   75

the name of such other party as the Agent may designate, either at public or
private sale or at any broker's board, in lots or in bulk, for cash or for
credit, with or without warranties or representations, and upon such other terms
and conditions as the Agent in its sole discretion may deem advisable, and the
Agent shall have the right to purchase at any such sale. If any Inventory and
Equipment shall require rebuilding, repairing, maintenance or preparation, the
Agent shall have the right, at its option, to do such of the aforesaid as is
necessary, for the purpose of putting the Inventory and Equipment in such
saleable condition as the Agent shall deem appropriate. Each Obligor agrees, at
the request of the Agent, to assemble the Inventory and Equipment and to make it
available to the Agent at premises of such Obligor or elsewhere and to make
available to the Agent the premises and facilities of such Obligor for the
purpose of the Agent's taking possession of, removing or putting the Inventory
and Equipment in saleable form. However, if notice of intended disposition of
any Collateral is required by law, it is agreed that ten (10) days notice shall
constitute reasonable notification and full compliance with the law. The net
cash proceeds resulting from the Agent's exercise of any of the foregoing rights
(after deducting all charges, costs and expenses, including reasonable
attorneys' fees), shall be applied by the Agent to the payment of the
Obligations, whether due or to become due, in such order as the Agent may elect,
and each Obligor shall remain liable to the Agent and the Lenders for any
deficiencies, and the Agent in turn agrees to remit to each Company or its
successors or assigns, any surplus resulting therefrom. The enumeration of the
foregoing rights is not intended to be exhaustive and the exercise of any right
shall not preclude the exercise of any other rights, all of which shall be
cumulative. Any mortgage(s), deed(s) of trust or assignment(s) on the Real
Estate shall govern the rights and remedies of the Agent and the Lenders
thereto.

         4. So long as an Event of Default has occurred and is continuing which
has not been waived in writing by the Agent, the Agent shall have the following
rights and remedies with respect to the Louisiana Pledged Collateral, which
rights and remedies are in addition to and are not in lieu or limitation of any
other rights and remedies that may be provided in this Agreement, under Chapter
9 of the Louisiana Commercial Laws (La. R.S. Sections 10:9-101, et seq.), under
the Uniform Commercial Code of any state other than Louisiana, or at law or
equity generally:

                  (a) The Agent may cause the Louisiana Pledged Collateral, or
any part or parts thereof, to be immediately seized wherever found, and sold,
whether in term of court or in vacation, under ordinary or executory process, in
accordance with applicable Louisiana law, to the highest bidder for cash, with
or without appraisement, without the necessity of making additional demand, or
of notifying any Obligor, or placing any Obligor in default.

                  (b) For purposes of foreclosure under Louisiana executory
process procedures, each Obligor confesses judgment and acknowledges to be
indebted unto and in favor of the Agent up to the full amount of the
Obligations, including, without limitation, principal, interest, costs,
expenses, attorneys' fees and other fees and charges. To the extent permitted
under applicable Louisiana law, each Obligor additionally waives: (a) the
benefit of appraisal as provided in Articles 2332, 2336, 2723 and 2724 of the
Louisiana Code of Civil Procedure and all other laws with regard to appraisal
upon judicial sale; (b) the demand and three (3) days' delay as provided under
Articles 2639 of the Louisiana Code of Civil Procedure; (c) the Notice of
Seizure as provided under Articles 2293 of the Louisiana Code of Civil
Procedure; (d) the three (3) days' delay provided under Articles

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2331 and 2722 of the Louisiana Code of Civil Procedure; and (e) all other
benefits provided under Articles 2331, 2722 and 2723 of the Louisiana Code of
Civil Procedure.

                  (c) Should any of the Louisiana Pledged Collateral be seized
as an incident to an action for the recognition or enforcement of the
Obligations or this Agreement, by executory process, sequestration, attachment,
writ of fieri facias or otherwise, each Obligor agrees that the court issuing
any such order shall, if requested by the Agent, appoint the Agent or any Person
named by the Agent at the time such seizure is requested, or at any time
thereafter, as keeper of the Louisiana Pledged Collateral as provided under La.
R.S. Sections 9:5136, et seq. Each Obligor agrees to pay the reasonable fees of
such keeper, which compensation to the keeper shall also be a part of the
Obligations.

                  (d) Should it become necessary for the Agent to foreclose
against the Louisiana Pledged Collateral, all declarations of fact that are made
under an authentic act before a Notary Public in the presence of two witnesses,
by a person declaring such facts to lie within his or her knowledge, shall
constitute authentic evidence for purposes of executory process and also for
purposes of La. R.S. Section 9:3509.1, La. R.S. Section 9:3504(D)(6) and La.
R.S. Section 10:9-508, as applicable.

                  (e) ANYTHING TO THE CONTRARY CONTAINED IN THIS AGREEMENT
NOTWITHSTANDING, THE SECURITY INTERESTS IN THE LOUISIANA PLEDGED COLLATERAL
GRANTED IN THIS, AND THE AGENT'S REMEDIES IN THE COURTS SITTING IN AND FOR THE
STATE OF LOUISIANA WITH RESPECT TO THE LOUISIANA PLEDGED COLLATERAL SHALL BE
GOVERNED BY LOUISIANA LAW, WITH NEW YORK LAW GOVERNING THE INTERPRETATION AND
CONSTRUCTION OF THE PROVISIONS OF THIS AGREEMENT, ITS APPLICATION TO THE PLEDGED
COLLATERAL AND THE PROCEEDS THEREOF, AND ALL RIGHTS AND OBLIGATIONS OF THE
PARTIES THEREUNDER IN ALL OTHER RESPECTS.

         5. Once the Agent has commenced the exercise of remedies under this
Section 10, notwithstanding that the Event of Default may at any time thereafter
no longer be continuing, the Agent shall be entitled to continue to exercise any
and all rights and remedies contemplated by this Section 10.

SECTION 11. TERMINATION

         Not later than ninety (90) days prior to an Anniversary Date, the
Parent shall deliver to the Agent a report, certified by the Parent's Chief
Financial Officer or other executive officer, setting forth in reasonable detail
the Parent's consolidated capital structure, including a summary of the material
terms (including maturity dates and redemption, exchange, conversion, call and
similar features, if applicable) of all outstanding debt and capital stock
(including preferred stock) and indicate therein (i) if any Qualified Capital
Stock will or may become Disqualified Capital Stock during the annual period
commencing on the Anniversary Date next following the date of such report and
(ii) a calculation of the Fixed Charge Coverage giving effect to the information
provided in clause (i) with respect to such period. Except as otherwise
permitted herein, the Companies or any Lender acting through the Agent may
terminate this Agreement and the Line of Credit only as of the initial or any
subsequent Anniversary Date and then only by giving the other at least sixty
(60) days prior

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written notice of termination. Notwithstanding the foregoing the Lenders acting
through the Agent may terminate this Agreement immediately upon the occurrence
of an Event of Default and so long as the same is continuing; provided, however,
that if the Event of Default is an event listed in Paragraph 1(c) of Section 10
of this Agreement, the Agent and the Lenders may regard this Agreement as
terminated and notice to that effect is not required. This Agreement, unless
terminated as herein provided, shall automatically continue from Anniversary
Date to the next successive Anniversary Date. Notwithstanding the foregoing, the
Companies may terminate this Agreement and the Line of Credit prior to any
applicable Anniversary Date upon sixty (60) days' prior written notice to the
Agent and the Lenders, provided that the Companies pay to the Agent for the
benefit of the Lenders immediately on demand, an Early Termination Fee, if
applicable. All Obligations shall become due and payable as of any termination
hereunder or under Section 10 hereof and, pending a final accounting, the Agent
and the Lenders may withhold any balances in each and every Company's account
(unless supplied with an indemnity satisfactory to the Agent) to cover all of
the Obligations, whether absolute or contingent. All of the Agent's and Lenders'
rights, liens and security interests shall continue after any termination until
all Obligations have been paid and satisfied in full.

SECTION 12. MISCELLANEOUS

         1. WAIVERS, ETC. Each Obligor hereby waives diligence, demand,
presentment and protest and any notices thereof as well as notice of nonpayment,
notice of dishonor, notice of intent to accelerate and notice of acceleration.
No delay or omission of the Agent and/or the Lenders or any Obligor to exercise
any right or remedy hereunder, whether before or after the happening of any
Event of Default, shall impair any such right or shall operate as a waiver
thereof or as a waiver of any such Event of Default. No single or partial
exercise by the Agent or the Lenders of any right or remedy precludes any other
or further exercise thereof, or precludes any other right or remedy.

         2. NO ORAL AGREEMENT. THIS WRITTEN AGREEMENT AND THE OTHER DOCUMENTS
REFERENCED HEREIN OR CONTEMPLATED HEREBY REPRESENT THE FINAL AGREEMENT AMONG THE
PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR
SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES HERETO. THERE ARE NO UNWRITTEN ORAL
AGREEMENTS AMONG THE PARTIES.

         3. INTEREST SAVINGS PROVISION. It is the intent of each Obligor, the
Agent and the Lenders to conform strictly to all applicable state and federal
usury laws. All agreements between a Company, any other Obligor, the Agent and
the Lenders whether now existing or hereafter arising and whether written or
oral, are hereby expressly limited so that in no contingency or event
whatsoever, whether by reason of acceleration of the maturity hereof or
otherwise, shall the amount contracted for, charged, received or collected by
the Agent and/or the Lenders for the use, forbearance, or detention of the money
loaned hereunder or otherwise, or for the payment or performance of any covenant
or obligation contained herein or in any other document evidencing, securing or
pertaining to the Obligations evidenced hereby which may be legally deemed to be
for the use, forbearance or detention of money, exceed the maximum amount which
each Company or any other Obligor is legally entitled to contract for, charge,
receive or collect under applicable state or

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federal law. If from any circumstances whatsoever fulfillment of any provision
hereof or of such other documents, at the time performance of such provision
shall be due, shall involve transcending the limit of validity prescribed by
law, then the obligation to be fulfilled shall be automatically reduced to the
limit of such validity, and if from any such circumstance the Agent and/or the
Lenders shall ever receive as interest or otherwise an amount in excess of the
maximum that can be legally collected, then such amount which would be excessive
interest shall be applied to the reduction of the principal indebtedness hereof
and any other amounts due with respect to the Obligations evidenced hereby, but
not to the payment of interest and if such amount which would be excess interest
exceeds the Obligations and all other non interest indebtedness described above,
then such additional amount shall be refunded to each Company. In determining
whether or not all sums paid or agreed to be paid by each Company for the use,
forbearance or detention of the Obligations to the Agent and/or the Lenders,
under any specific contingency, exceeds the maximum amount permitted by
applicable law, each Company and the Agent and the Lenders shall to the maximum
extent permitted under applicable law, (a) treat all Obligations as but a single
extension of credit, (b) characterize any nonprincipal payment as an expense,
fee or premium rather than as sums paid or agreed to be paid by each Company for
the use, forbearance or detention of the Obligations, (c) exclude voluntary
prepayments and the effect thereof, and (d) amortize, prorate, allocate and
spread in equal parts, the total amount of such sums paid or agreed to be paid
by each Company for the use, forbearance or detention of the Obligations to the
Agent and the Lenders throughout the entire contemplated term of the Obligations
so that the interest rate is uniform through the entire term of the Obligations.
The terms and provisions of this paragraph shall control and supersede every
other provision hereof and all other agreements between a Company, each other
Obligor, the Agent and the Lenders.

         4. SEVERABILITY. If any provision hereof or of any other agreement made
in connection herewith is held to be illegal or unenforceable, such provision
shall be fully severable, and the remaining provisions of the applicable
agreement shall remain in full force and effect and shall not be affected by
such provision's severance. Furthermore, in lieu of any such provision, there
shall be added automatically as a part of the applicable agreement a legal and
enforceable provision as similar in terms to the severed provision as may be
possible.

         5. WAIVER OF JURY TRIAL. TO THE EXTENT PERMITTED BY APPLICABLE LAW,
EACH COMPANY AND OTHER OBLIGOR, THE AGENT AND THE LENDERS EACH HEREBY WAIVE ANY
RIGHT TO A TRIAL BY JURY IN ANY ACTION OR PROCEEDING ARISING OUT OF THIS
AGREEMENT. EACH COMPANY AND OTHER OBLIGOR HEREBY IRREVOCABLY WAIVES PERSONAL
SERVICE OF PROCESS AND CONSENTS TO SERVICE OF PROCESS BY CERTIFIED OR REGISTERED
MAIL, RETURN RECEIPT REQUESTED.

         6. NOTICES. Except as otherwise herein provided, any notice or other
communication required hereunder shall be in writing, and shall be deemed to
have been validly served, given or delivered when hand delivered or sent by
telegram or telex, or three days after deposit in the United State mails, with
proper first class postage prepaid and addressed to the party to be notified as
follows:

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         (a)      if to the Agent, at:

                  The CIT Group/Business Credit, Inc., as Agent
                  5420 LBJ Freeway, Suite 200
                  Dallas, Texas
                  Attn:  Regional Credit Manager
                  Fax No.:  (972) 455-1690

                  with a copy to Agent's Counsel:

                  Patton Boggs LLP
                  2001 Ross Avenue, Suite 3000
                  Dallas, Texas  75201
                  Attn:  James C. Chadwick
                  Fax No.:  (214) 758-1550

         (b)      if to any other party becoming a Lender hereunder to the
                  address specified in the Assignment and Transfer Agreement;

         (c)      if to any other Lender which is a party hereto (other than
                  CITBC), to the address specified under the signature of such
                  Lenders or agent, as the case may be, on the signature pages
                  hereof.

         (d)      if to any Company at:
                  c/o UTI Energy Corp.
                  16800 Greenspoint Park
                  Suite 225N
                  Houston, Texas 77060
                  Attention: Chief Financial Officer
                  Fax No.: (281) 875-9145

                  with a copy to Company's Counsel:

                  Fulbright & Jaworski LLP
                  1301 McKinney, Suite 5100
                  Houston, Texas 71010
                  Attn: Joshua P. Agrons, Partner
                  Fax No.: (713) 651-5246

         (e)      if to any Guarantor (other than UTICO) at:
                  c/o UTI Energy Corp.
                  16800 Greenspoint Park
                  Suite 225N
                  Houston, Texas  77060
                  Attention:  Chief Financial Officer
                  Fax No.:  (281) 873-4141

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                  with a copy to Guarantor's Counsel:

                  Fulbright & Jaworski LLP
                  1301 McKinney, Suite 5100
                  Houston, Texas  71010
                  Attn: Joshua P. Agrons, Partner
                  Fax No.: (713) 651-5246

         (f)      if to UTICO, Inc.
                  UTICO, Inc.
                  801 West Street
                  Wilmington, DE 19801-1545

                  with a copy to UTICO, Inc.'s Counsel:

                  Fulbright & Jaworski LLP
                  1301 McKinney, Suite 5100
                  Houston, Texas 71010
                  Attn: Joshua P. Agrons, Partner
                  Fax No.: (713) 651-5246

or to such other address as any party may designate for itself by like notice.

         7. GOVERNING LAW. EXCEPT AS PROVIDED IN SECTION 10, PARAGRAPH 4(e) OF
THIS AGREEMENT, THE VALIDITY, INTERPRETATION AND ENFORCEMENT OF THIS AGREEMENT
SHALL BE GOVERNED BY THE INTERNAL LAWS OF THE STATE OF NEW YORK (INCLUDING, BUT
NOT LIMITED TO SECTION 5-1401 OF THE GENERAL OBLIGATIONS LAW OF THE STATE OF NEW
YORK).

         8. NO AMENDMENTS. This Agreement can be amended, modified or changed
only by a writing signed by each Obligor, the Agent and the Required Lenders
(unless the consent of all Lenders is required pursuant to Section 14, Paragraph
10 of this Agreement).

         9. SUBMISSION TO JURISDICTION. (a) ANY LEGAL ACTION OR PROCEEDING WITH
RESPECT TO THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS MAY BE BROUGHT IN THE
COURTS OF THE STATE OF NEW YORK, NEW YORK COUNTY, OR OF THE UNITED STATES FOR
THE SOUTHERN DISTRICT OF NEW YORK AND, BY EXECUTION AND DELIVERY OF THIS
AGREEMENT, EACH COMPANY AND OTHER OBLIGOR HEREBY IRREVOCABLY ACCEPTS IN RESPECT
OF ITS PROPERTY, UNCONDITIONALLY, THE JURISDICTION OF THE AFORESAID COURTS WITH
RESPECT TO ANY SUCH ACTION OR PROCEEDING EACH COMPANY FURTHER IRREVOCABLY
CONSENTS TO THE SERVICE OF PROCESS

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OUT OF ANY OF THE AFOREMENTIONED COURTS IN ANY SUCH ACTION OR PROCEEDING BY THE
MAILING OF COPIES THEREOF BY REGISTERED OR CERTIFIED MAIL POSTAGE PREPAID), TO
IT AT ITS ADDRESS PROVIDED IN SECTION 14, PARAGRAPH 6(d) OF THIS AGREEMENT SUCH
SERVICE TO BECOME EFFECTIVE THIRTY (30) DAYS AFTER SUCH MAILING. NOTHING HEREIN
SHALL AFFECT THE RIGHT OF THE AGENT OR ANY LENDER TO SERVE PROCESS IN ANY OTHER
MANNER PERMITTED BY LAW OR TO COMMENCE LEGAL PROCEEDINGS OR OTHERWISE PROCEED
AGAINST EACH COMPANY IN ANY OTHER JURISDICTION.

         (b) EACH COMPANY AND OTHER OBLIGOR HEREBY IRREVOCABLY WAIVES ANY
OBJECTION WHICH IT MAY NOW OR HEREAFTER HAVE TO THE LAYING OF VENUE OF ANY OF
THE AFORESAID ACTIONS OR PROCEEDINGS ARISING OUT OF OR IN CONNECTION WITH THIS
AGREEMENT BROUGHT IN THE COURTS REFERRED TO IN THE FIRST SENTENCE OF CLAUSE (a)
ABOVE AND HEREBY FURTHER IRREVOCABLY WAIVES AND AGREES NOT TO PLEAD OR CLAIM IN
ANY SUCH COURT THAT ANY SUCH ACTION OR PROCEEDING BROUGHT IN ANY SUCH COURT HAS
BEEN BROUGHT IN AN INCONVENIENT FORUM.

         10. WAIVER OF CONSUMER RIGHTS. EACH COMPANY AND OTHER OBLIGOR HEREBY
WAIVES ITS RIGHTS, UNDER THE DECEPTIVE TRADE PRACTICES - CONSUMER PROTECTION
ACT, SECTION 17.41 ET. SEQ. BUSINESS & COMMERCE CODE, A LAW THAT GIVES CONSUMERS
SPECIAL RIGHTS AND PROTECTIONS. AFTER CONSULTATION WITH AN ATTORNEY OF ITS OWN
SELECTION, EACH COMPANY AND OTHER OBLIGOR VOLUNTARILY CONSENTS TO THIS WAIVER.
EACH COMPANY AND OTHER OBLIGOR EXPRESSLY WARRANTS AND REPRESENTS THAT IT (a) IS
NOT IN A SIGNIFICANTLY DISPARATE BARGAINING POSITION RELATIVE TO LENDER, AND (b)
HAS BEEN REPRESENTED BY LEGAL COUNSEL IN CONNECTION WITH THE TRANSACTIONS
CONTEMPLATED BY THIS AGREEMENT.

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         11. [Intentionally Omitted]

         12. JOINT AND SEVERAL LIABILITY; STRUCTURE OF CREDIT FACILITY;
OBLIGOR'S INTENT.

         (a) The Obligors acknowledge that the loans and advances and other
credit accommodations to any Company or the Companies as a group hereunder shall
be for the benefit of all Obligors. The Obligors hereby irrevocably and
unconditionally: (i) agree that they are jointly and severally liable to the
Lenders and the Agent, for the full and prompt payment of the Obligations and
the performance by each Company of its Obligations hereunder in accordance with
the terms hereof; (ii) agree to fully and promptly perform all of its
Obligations hereunder with respect to each advance of credit hereunder as if
such advance had been made directly to it; and (iii) agree as a primary
obligation to indemnify Lenders and the Agent on demand for and against any loss
incurred by Lenders and/or the Agent as a result of any of the Obligations of
any one or more of the Obligors being or becoming void, voidable, unenforceable
or ineffective for any reason whatsoever, whether or not known to Lender and/or
the Agent or any Person, the amount of such loss being the amount which Lender
and/or the Agent would otherwise have been entitled to recover from any one or
more of the Obligors.

         (b) It is the intent of each Obligor that the indebtedness, obligations
and liability hereunder of no one of them be subject to challenge on any basis,
including, without limitation, pursuant to any applicable fraudulent conveyance
or fraudulent transfer laws. Accordingly, as of the date hereof, the liability
of each Obligor under this Paragraph 12, together with all of its other
liabilities to all Persons as of the date hereof and as of any other date on
which a transfer or conveyance is deemed to occur by virtue of this Agreement,
calculated in amount sufficient to pay its probable net liabilities on its
existing indebtedness as the same become absolute and matured ("DATED
LIABILITIES") is, and is to be, less than the amount of the aggregate of a fair
valuation of its property as of such corresponding date ("DATED ASSETS"). To
this end, each Obligor under this Paragraph 12, (i) grants to and recognizes in
each other Obligor, ratably, rights of subrogation and contribution in the
amount, if any, by which the Dated Assets of such Obligor, but for the aggregate
of subrogation and contribution in its favor recognized herein, would exceed the
Dated Liabilities of such Obligor or, as the case may be, (ii) acknowledges
receipt of and recognizes its right to subrogation and contribution ratably from
each of the other Obligors in the amount, if any, by which the Dated Liabilities
of such Obligor, but for the aggregate of subrogation and contribution in its
favor recognized herein, would exceed the Dated Assets of such Obligor under
this Paragraph 12. In recognizing the value of the Dated Assets and the Dated
Liabilities, it is understood that Obligors will recognize, to at least the same
extent of their aggregate recognition of liabilities hereunder, their rights to
subrogation and contribution hereunder. It is a material objective of this
Paragraph 12 that each Obligor recognizes rights to subrogation and contribution
rather than be deemed to be insolvent (or in contemplation thereof) by reason of
an arbitrary interpretation of its joint and several obligations hereunder. In
addition to and not in limitation of the foregoing provisions of this Paragraph
12, the Obligors and Lender and/or the Agent hereby agree and acknowledge that
it is the intent of each Obligor, Lender and the Agent that the obligations of
each Obligor hereunder be in all respects in compliance with, and not be
voidable pursuant to, applicable fraudulent conveyance and fraudulent transfer
laws.

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<PAGE>   83

         (c) Each Obligor agrees and acknowledges that the present structure of
the credit facilities detailed in this Agreement is based in part upon the
financial and other information presently known to Lender and/or the Agent
regarding certain Obligors, the corporate structure of the Obligors, and the
present financial condition of the Obligors. Each Obligor represents to the
Agent and the Lenders that its existing cash management system processes
collections only on a consolidated basis for Parent and its Subsidiaries (other
than as to NDC, UWSI, NDS and NDM, which will be in the cash management system
by January 2, 2000) and that it would impose a material operational inefficiency
on such cash management if it were changed to process collections separately for
each Obligor. Each Obligor represents to the Agent and the Lenders that it
conducts its commercial dealings with its suppliers, vendors and other creditors
as a consolidated enterprise of Parent and its Subsidiaries and not as a
separate entity or on any other basis, and holds itself out to the business
community at large as an integrated energy services company rather than as
separate and distinct companies or enterprises. Each Obligor represents to the
Agent and the Lenders that all financial and credit information provided to each
Obligor's suppliers, vendors and other creditors are provided only on a
consolidated basis for Parent and its Subsidiaries and that such information is
not provided for any Obligor on a separate basis or on any other basis. Each
Obligor agrees that it shall not make or permit to exist any loans, intercompany
accounts or investments between itself and any Company, other present or future
Obligor or other present or future Subsidiary of Parent which do not qualify as
Permitted Intercompany Balances. Each Obligor hereby agrees that Lender and the
Agent shall have the right, in its or their sole credit judgment, to require
that any or all of the following changes be made to these credit facilities
without limitation on the other applicable provisions of the Loan Documents: (i)
establish at the Closing Date and thereafter enforce consolidated lockbox and
dominion accounts after the occurrence of any Event of Default and during the
continuation thereof, or so long as Availability is less than $15,000,000 for
all of the Companies, subject to the last sentence of Section 3, paragraph 4,
(ii) further restrict or prohibit loans, intercompany accounts and investments
among the Companies, the Obligors and Parent and its Subsidiaries following the
occurrence of any Event of Default and during the continuation thereof, or so
long as Availability is less than $15,000,000 for all of the Companies, (iii)
establish or exercise controls or such other procedures as shall be reasonably
deemed by the Agent to be useful in tracking where loans are made under this
Agreement and the source of payments received by the Agent and/or Lender on such
loans, and (iv) establishing separate borrowing bases, requiring application of
collections separately for each Company and restricting Revolving Loans to the
Companies, and the Availability of the Companies, to within the same following
the occurrence of any Event of Default and during the continuation thereof, or
so long as Availability is less than $15,000,000 for all of the Companies.

SECTION 13. AGREEMENT BETWEEN THE LENDERS

         1. (a) The Agent, for the account of the Lenders, shall disburse all
loans and advances to each Company and shall handle all collections of
Collateral and repayment of Obligations. It is understood that for purposes of
advances to each Company and for purposes of this section, the Agent is using
the funds of the Agent.

                  (b) Unless the Agent shall have been notified in writing by
any Lender prior to any advance to any Company that such Lender will not make
the amount which would constitute its share of the borrowing on such date
available to the Agent, the Agent may assume that such Lender shall

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<PAGE>   84

make such amount available to the Agent on a Settlement Date, and the Agent may,
in reliance upon such assumption, make available to each Company a corresponding
amount. A certificate of the Agent submitted to any Lender with respect to any
amount owing under this subsection shall be conclusive, absent manifest error.
If such Lender's share of such borrowing is not in fact made available to the
Agent by such Lender on the Settlement Date, the Agent shall be entitled to
recover such amount with interest thereon at the rate per annum applicable to
Revolving Loans hereunder, on demand, from any Company without prejudice to any
rights which the Agent may have against such Lender hereunder. Nothing contained
in this subsection shall relieve any Lender which has failed to make available
its ratable portion of any borrowing hereunder from its obligation to do so in
accordance with the terms hereof. Nothing contained herein shall be deemed to
obligate the Agent to make available to any Company the full amount of a
requested advance when the Agent has any notice (written or otherwise) that any
of the Lenders will not advance its ratable portion thereof.

         2. On the Settlement Date, the Agent and the Lenders shall each remit
to the other, in immediately available funds, all amounts necessary so as to
ensure that, as of the Settlement Date, the Lenders shall have their
proportionate share of all outstanding Obligations.

         3. The Agent shall forward to each Lender, at the end of each month, a
copy of the account statement rendered by the Agent to each Company.

         4. The Agent shall, after receipt of any interest and fees earned under
this Agreement, promptly remit to the Lenders: (a) their pro rata portion of all
fees; provided, however, that the Lenders (other than CITBC in its role as the
Agent) shall (x) not share in the Administrative Management Fee or Documentation
Fees or the fees provided for in Section 8, Paragraphs 5 and 8 of this
Agreement; and (y) receive their share of the Loan Facility Fee in accordance
with their respective agreements with the Agent and; (b) interest computed at
the rate and as provided for in Section 8 of this Agreement on all outstanding
amounts advanced by the Lenders on each Settlement Date, prior to adjustment,
that are subsequent to the last remittance by the Agent to the Lenders of each
Company's interest.

         5. (a) Each Obligor acknowledges that the Lenders may sell
participations, in an amount of not less than $5,000,000 in the loans and
extensions of credit made and to be made to each Company hereunder. Each Obligor
further acknowledges that in doing so, the Lenders may grant to such
participants certain rights which would require the participant's consent to
certain waivers, amendments and other actions with respect to the provisions of
this Agreement, provided that the consent of any such participant shall not be
required except for matters requiring the consent of all Lenders hereunder as
set forth in Section 14, Paragraph 10 of this Agreement.

                  (b) Each Obligor authorizes each Lender to disclose to any
participant or purchasing lender (each, a "TRANSFEREE") and any prospective
Transferee any and all financial information in such Lender's possession
concerning such Obligor and its affiliates which has been delivered to such
Lender by or on behalf of such Obligor pursuant to this Agreement or which has
been delivered to such Lender by or on behalf of such Obligor in connection with
such Lender's credit evaluation of such Obligor and its affiliates prior to
entering into this Agreement.

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         6. Each Company hereby agrees that each Lender is solely responsible
for its portion of the Line of Credit and that neither the Agent nor any Lender
shall be responsible for, nor assume any obligations for the failure of any
Lender to make available its portion of the Line of Credit. Further, should any
Lender refuse to make available its portion of the Line of Credit, then the
other Lender may, but without obligation to do so, increase, unilaterally, its
portion of the Line of Credit in which event such Company is so obligated to
that other Lender.

         7. In the event that the Agent, the Lenders or any one of them is sued
or threatened with suit by any Obligor, or by any receiver, trustee, creditor or
any committee of creditors on account of any preference, voidable transfer or
lender liability issue, alleged to have occurred or been received as a result
of, or during the transactions contemplated under this Agreement, then in such
event any money paid in satisfaction or compromise of such suit, action, claim
or demand and any expenses, costs and attorneys' fees paid or incurred in
connection therewith, whether by the Agent, the Lenders or any one of them,
shall be shared proportionately by the Lenders. In addition, any costs,
expenses, fees or disbursements incurred by outside agencies or attorneys
retained by the Agent to effect collection or enforcement of any rights in the
Collateral, including enforcing, preserving or maintaining rights under this
Agreement shall be shared proportionately between and among the Lenders to the
extent not reimbursed by such Company or from the proceeds of Collateral. The
provisions of this paragraph shall not apply to any suits, actions, proceedings
or claims that (x) predate the date of this Agreement or (y) are based on
transactions, actions or omissions that predate the date of this Agreement.

         8. Each of the Lenders agrees with each other Lender that any money or
assets of each Obligor held or received by such Lender, no matter how or when
received, shall be applied to the reduction of the Obligations (to the extent
permitted hereunder) after (x) the occurrence of an Event of Default and so long
as the same is continuing and (y) the election by the Required Lenders to
accelerate the Obligations. In addition, each Obligor authorizes, and the
Lenders shall have the right, without notice, upon any amount becoming due and
payable hereunder, to set-off and apply against any and all property held by, or
in the possession of such Lender the Obligations due such Lenders.

         9. CITBC shall have the right at any time to assign to one or more
Eligible Assignees, all or a portion (but in an amount that is not less than
$5,000,000) of its rights and obligations under this Agreement; provided that no
such assignment shall be made to any Person that does not, prior to the
execution of such Assignment Agreement, execute and deliver to the Agent and the
Parent IRS Form 1001, Form 4224 or successors forms, and is other exempt from
IRS interest withholding obligations. Upon execution of an Assignment and
Transfer Agreement, (i) the assignee thereunder shall be a party hereto and, to
the extent that rights and obligations hereunder have been assigned to it
pursuant to such assignment, have the rights and obligations of CITBC as the
case may be hereunder and (ii) CITBC shall, to the extent that rights and
obligations hereunder have been assigned by it pursuant to such assignment,
relinquish its rights and be released from its obligations under this Agreement.
Each Obligor shall, if necessary, execute any documents reasonably required to
effectuate the assignments. No other Lender may assign its interest in the loans
and advances and extensions of credit hereunder without the prior written
consent of the Agent, and such assignment, if consented to, shall be in amounts
of not less than $5,000,000.

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SECTION 14. LENDERS

         1. Each Lender hereby irrevocably designates and appoints CITBC as the
Agent for the Lenders under this Agreement and any Loan Documents and
irrevocably authorizes CITBC as Agent for such Lender, to take such action on
its behalf under the provisions of this Agreement and all Loan Documents and to
exercise such powers and perform such duties as are expressly delegated to the
Agent by the terms of this Agreement and any Loan Document together with such
other powers as are reasonably incidental thereto. Notwithstanding any provision
to the contrary elsewhere in this Agreement, the Agent shall not have any duties
or responsibilities, except those expressly set forth herein, or any fiduciary
relationship with any Lender and no implied covenants, functions,
responsibilities, duties, obligations or liabilities shall be read into this
Agreement and the Loan Documents or otherwise exist against the Agent.

         2. The Agent may execute any of its duties under this Agreement and any
Loan Document by or through agents or attorneys-in-fact and shall be entitled to
the advice of counsel concerning all matters pertaining to such duties.

         3. Neither the Agent nor any of its officers, directors, employees,
agents, or attorneys-in-fact shall be (i) liable to any Lender for any action
lawfully taken or omitted to be taken by it or such person under or in
connection with this Agreement and/or any Loan Documents (except for its or such
person's own gross negligence or willful misconduct), or (ii) responsible in any
manner to any of the Lenders for any recitals, statements, representations or
warranties made by any Obligor or any officer thereof contained in this
Agreement and all Loan Documents or in any certificate, report, statement or
other document referred to or provided for in, or received by the Agent under or
in connection with, this Agreement and all ancillary documents or for the value,
validity, effectiveness, genuineness, enforceability or sufficiency of this
Agreement and all ancillary documents or for any failure of any Obligor to
perform its obligations thereunder. The Agent shall not be under any obligation
to any Lender to ascertain or to inquire as to the observance or performance of
any of the agreements contained in, or conditions of, this Agreement and any
Loan Document or to inspect the properties, books or records of Obligors.

         4. The Agent shall be entitled to rely, and shall be fully protected in
relying, upon any note, writing, resolution, notice, consent, certificate,
affidavit, letter, cablegram, telegram, telecopy, telex or teletype message,
statement, order or other document or conversation believed by it to be genuine
and correct and to have been signed, sent or made by the proper person or
persons and upon advice and statements of legal counsel (including, without
limitation, counsel to any Obligor), independent accountants and other experts
selected by the Agent. Neither the Agent nor the Lenders shall change the
account into which Revolving Loan proceeds are disbursed in response to any
telephonic borrowing request. All Revolving Loan proceeds shall be disbursed by
the Agent only to the bank accounts designated in a written notice, on the
Parent's letterhead, signed by the Parent, and to which the chief financial
officer and the controller of the Parent are both signatories. The Agent shall
be fully justified in failing or refusing to take any action under this
Agreement and all ancillary documents unless it shall first receive such advice
or concurrence of the Lenders, or the Required Lenders, as the case may be, as
it deems appropriate or it shall first be indemnified to its satisfaction by the
Lenders against any and all liability and expense which may be incurred by it by
reason of

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<PAGE>   87

taking or continuing to take any such action. The Agent shall in all cases be
fully protected in acting, or in refraining from acting, under this Agreement
and all ancillary documents in accordance with a request of the Lenders, or the
Required Lenders, as the case may be, and such request and any action taken or
failure to act pursuant thereto shall be binding upon all the Lenders.

         5. The Agent shall not be deemed to have knowledge or notice of the
occurrence of any Default or Event of Default hereunder unless the Agent has
received notice from a Lender or a Company describing such Default or Event of
Default. In the event that the Agent receives such a notice, the Agent shall
promptly give notice thereof to the Lenders. The Agent shall take such action
with respect to such Default or Event of Default as shall be reasonably directed
by the Lenders, or Required Lenders, as the case may be; provided that unless
and until the Agent shall have received such direction, the Agent may in the
interim (but shall not be obligated to) take such action, or refrain from taking
such action, with respect to such Default or Event of Default as it shall deem
advisable and in the best interests of the Lenders.

         6. Each Lender expressly acknowledges that neither the Agent nor any of
its officers, directors, employees, agents or attorneys-in-fact has made any
representations or warranties to it and that no act by the Agent hereinafter
taken, including any review of the affairs of any Obligor shall be deemed to
constitute any representation or warranty by the Agent to any Lender. Each
Lender represents to the Agent that it has, independently and without reliance
upon the Agent or any other Lender and based on such documents and information
as it has deemed appropriate, made its own appraisal of and investigation into
the business, operations, property, financial and other condition and
creditworthiness of each Obligor and made its own decision to enter into this
Agreement. Each Lender also represents that it will, independently and without
reliance upon the Agent or any other Lender and based on such documents and
information as it shall deem appropriate at the time, continue to make its own
credit analysis, appraisals and decisions in taking or not taking action under
this Agreement and to make such investigation as it deems necessary to inform
itself as to the business, operations, property, financial and other condition
or creditworthiness of each Obligor. The Agent, however, shall provide the
Lenders with copies of all financial statements, projections and business plans
which come into the possession of the Agent or any of its officers, employees,
agents or attorneys-in-fact.

         7. The Lenders agree to indemnify the Agent in its capacity as such (to
the extent not reimbursed by each Obligor and without limiting the obligation of
each Obligor to do so), from and against any and all liabilities, obligations,
losses, damages, penalties, actions, judgments, suits, costs, expenses or
disbursements of any kind whatsoever (including negligence on the part of the
agent) which may at any time be imposed on, incurred by or asserted against the
Agent in anyway relating to or arising out of this Agreement or any ancillary
documents or any documents contemplated by or referred to herein or the
transactions contemplated hereby or any action taken or omitted by the Agent
under or in connection with any of the foregoing; provided that no Lender shall
be liable for the payment of any portion of such liabilities, obligations,
losses, damages, penalties, actions, judgments, suits, costs, expenses or
disbursements resulting solely from the Agent's gross negligence or willful
misconduct. The agreements in this paragraph shall survive the payment of the
obligations.

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       84
<PAGE>   88

         8. The Agent may make loans to, and generally engage in any kind of
business with any Obligor as though the Agent were not the Agent hereunder. With
respect to its loans made or renewed by it or loan obligations hereunder as
Lender, the Agent shall have the same rights and powers, duties and liabilities
under this Agreement as any Lender and may exercise the same as though it was
not the Agent and the terms "Lender" and "Lenders" shall include the Agent in
its individual capacities.

         9. The Agent may resign as the Agent upon thirty (30) days' notice to
the Lenders and such resignation shall be effective upon the appointment of a
successor Agent. If the Agent shall resign as Agent, then the Lenders shall
appoint a successor Agent for the Lenders whereupon such successor Agent shall
succeed to the rights, powers and duties of the Agent and the term "Agent" shall
mean such successor Agent effective upon its appointment, and the former Agent's
rights, powers and duties as Agent shall be terminated, without any other or
further act or deed on the part of such former Agent or any of the parties to
this Agreement. After any retiring Agent's resignation hereunder as the Agent
the provisions of this section shall inure to its benefit as to any actions
taken or omitted to be taken by it while it was the Agent.

         10. Notwithstanding anything contained in this Agreement to the
contrary, the Agent will not, without the prior written consent of all Lenders:
(a) amend this Agreement to (i) increase the Line of Credit; (ii) reduce the
interest rates; (iii) reduce or waive (A) any fees in which the Lenders share
hereunder; or (B) the repayment of any Obligations due the Lenders; (iv) extend
the maturity of the Obligations; or (v) alter or amend (1) this Paragraph 10 or
(2) the definitions of Accounts Receivable Advance Percentage, Equipment Advance
Percentage, or Required Lenders, or the Agent's criteria for determining
compliance with such definitions of eligibility; (b) release Collateral in bulk
without a corresponding reduction in the Obligations to the Lenders, or (c)
intentionally make any Revolving Loan if after giving effect thereto the total
of Revolving Loans for each Company would exceed one hundred and ten percent
(110%) of the maximum amount available under Sections 3 and 4 of this Agreement.
In all other respects the Agent is authorized to take such actions or fail to
take such actions if the Agent, in its reasonable discretion, deems such to be
advisable and in the best interest of the Lenders, including, but not limited
to, the making of an overadvance or the termination of this Agreement upon the
occurrence and during the continuance of an Event of Default unless it is
specifically instructed to the contrary by the Required Lenders.

         11. In the event any Lender's consent is required pursuant to the
provisions of this Agreement and such Lender does not respond to any request by
the Agent for such consent within ten (10) days after such request is made to
such Lender, such failure to respond shall be deemed a consent. In addition, in
the event that any Lender declines to give its consent to any such request, it
is hereby mutually agreed that the Agent and/or any other Lender shall have the
right (but not the obligation) to purchase such Lender's share of the Loans for
the full amount thereof together with accrued interest thereon to the date of
such purchase.

         12. Each Lender agrees that notwithstanding the provisions of Section
11 of this Agreement any Lender may terminate this Agreement and the Line of
Credit only as of the initial or any subsequent Anniversary Date and then only
by giving the Agent sixty (60) days prior written notice thereof. Within thirty
(30) days after receipt of any such termination notice, the Agent shall,

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       85
<PAGE>   89
at its option, either (i) give notice of termination to each Company hereunder
or (ii) purchase the Lender's share of the Obligations hereunder for the full
amount thereof plus accrued interest thereon. Unless so terminated this
Agreement and the Line of Credit shall be automatically extended from
Anniversary Date to Anniversary Date.

                  [REMAINDER OF THIS PAGE INTENTIONALLY BLANK]

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       86
<PAGE>   90

         IN WITNESS WHEREOF, this Agreement has been duly executed on the date
first written above.

                                   COMPANIES:

                                   UTI DRILLING, L.P.

                                   By:  UTICO HARD ROCK BORING, INC.,
                                        As Sole General Partner

                                        By:
                                           -------------------------------------
                                           John E. Vollmer III, Vice President

                                   UTI MANAGEMENT SERVICES, L.P.

                                   By:  UTICO HARD ROCK BORING, INC.,
                                        As Sole General Partner

                                        By:
                                           -------------------------------------
                                           John E. Vollmer III, Vice President

                                   NORTON DRILLING COMPANY
                                   UNIVERSAL WELL SERVICES, INC.
                                   SUITS DRILLING COMPANY

                                   By:
                                      ------------------------------------------
                                      John E. Vollmer III, Vice President
                                      signing as such on behalf of each of the
                                      foregoing Companies.

                                               UTI - LOAN AND SECURITY AGREEMENT

<PAGE>   91

                                   GUARANTORS:

                                   UTI ENERGY CORP.
                                   UTICO, INC.
                                   UTICO HARD ROCK BORING, INC.
                                   NORTON DRILLING SERVICES, INC.
                                   NORTON DRILLING COMPANY MEXICO, INC.
                                   INTERNATIONAL PETROLEUM SERVICE
                                     COMPANY

                                   By:
                                      ------------------------------------------
                                      John E. Vollmer III, Vice President
                                      signing as such on behalf of each of the
                                      foregoing Obligors

                                               UTI - LOAN AND SECURITY AGREEMENT
<PAGE>   92

                                   THE CIT GROUP/BUSINESS CREDIT, INC.,
                                     as Agent

                                   By:
                                      ------------------------------------------
                                      Name:
                                           -------------------------------------
                                      Title:
                                            ------------------------------------

                                   THE CIT GROUP/BUSINESS CREDIT, INC.,
                                     as a Lender

                                   By:
                                      -----------------------------------------
                                      Name:
                                           ------------------------------------
                                      Title:
                                            -----------------------------------

                                   Revolving Loan Commitment:  $
                                                                ---------------

                                   Address for Notices:

                                   The CIT Group/Business Credit, Inc., as Agent
                                   5420 LBJ Freeway, Suite 200
                                   Dallas, Texas
                                   Attn: Regional Credit Manager
                                   Fax No.: (972) 455-1690

                                               UTI - LOAN AND SECURITY AGREEMENT

<PAGE>   93

                                   GMAC BUSINESS CREDIT, INC.,
                                     as a Lender and Syndication Agent

                                   By:
                                      -----------------------------------------
                                      Name:
                                           ------------------------------------
                                      Title:
                                            -----------------------------------

                                   Revolving Loan Commitment:  $
                                                                ---------------

                                   Address for Notices:

                                   --------------------------------

                                   --------------------------------

                                   --------------------------------

                                   Attn:
                                        ---------------------------
                                   Fax No.:
                                           ------------------------

                                               UTI - LOAN AND SECURITY AGREEMENT
<PAGE>   94

                                   FOOTHILL CAPITAL CORPORATION,
                                     as a Lender and Documentation Agent

                                   By:
                                      ------------------------------------------
                                      Name:
                                           -------------------------------------
                                      Title:
                                            ------------------------------------

                                   Revolving Loan Commitment:  $
                                                                ----------------

                                   Address for Notices:

                                   --------------------------------

                                   --------------------------------

                                   --------------------------------

                                   Attn:
                                        ---------------------------
                                   Fax No.:
                                           ------------------------

                                               UTI - LOAN AND SECURITY AGREEMENT
<PAGE>   95

                                    EXHIBIT A
                         REVOLVING LOAN PROMISSORY NOTE

                                November 22, 1999

$65,000,000

FOR VALUE RECEIVED, the undersigned Companies (each a "COMPANY" and,
collectively, the "COMPANIES"), promise, jointly and severally, to pay to the
order of THE CIT GROUP/BUSINESS CREDIT, INC. (herein "CITBC"), as Agent for the
Lenders under a certain Loan and Security Agreement of even date herewith
between CITBC as Agent and Lender, other Lenders parties thereto and each
Company (herein the "AGREEMENT") at its office located at 1211 Avenue of the
Americas, New York, New York 10036, or such other address as may be designated
by the Agent, in lawful money of the United States of America and in immediately
available funds, the principal amount of Sixty Five Million and No/100 Dollars
($65,000,000), or such other principal amount advanced pursuant to Section 3,
Paragraph 1 or Section 4 of the Agreement. The balance of such Revolving Loan
will fluctuate as a result of the daily application of the proceeds of
collections of the Accounts and the making of additional Revolving Loans as
described in said Section 3 or Section 4 of the Agreement. The Revolving Loans
may be borrowed, repaid and reborrowed by any Company, subject to the terms of
the Agreement. A final payment in an amount equal to the outstanding aggregate
balance of principal and interest remaining unpaid, if any, under this Revolving
Loan Promissory Notes as shown on the books and records of the Agent shall be
due and payable upon any termination of the Agreement.

All capitalized terms used herein shall have the meaning provided therefor in
this Agreement, unless otherwise defined herein.

The Companies further promise, jointly and severally, to pay interest at such
office, in like money, on the unpaid principal amount owing hereunder from time
to time from the date hereof on the dates and at the rates specified in Section
8, Paragraph 1 of the Agreement.

If any payment on this Revolving Loan Promissory Note becomes due and payable on
a day other than a Business Day, the maturity thereof shall be extended to the
next succeeding Business Day, and with respect to payments of principal,
interest thereon shall be payable at the then applicable rate during such
extension.

This Revolving Loan Promissory Note is a Revolving Loan Promissory Note referred
to in the Agreement, and is subject to, and entitled to, all provisions and
benefits thereof and is subject to optional and mandatory prepayment, in whole
or in part, as provided therein.

The date and amount of the advance(s) made hereunder may be recorded on the
schedule which is attached hereto and hereby made part of this Note or the
separate ledgers maintained by the Agent,

                                               UTI - LOAN AND SECURITY AGREEMENT

                                      A-1
<PAGE>   96

provided that any failure to record any such information on such schedule shall
not in any manner affect the obligation of any Company to make payments of
principal and interest in accordance with the terms of this Revolving Loan
Promissory Note. The aggregate unpaid principal amount of all advances made
pursuant hereto may be set forth in the balance column on said schedule or such
ledgers maintained by the Agent. All such advances, whether or not so recorded,
shall be due as part of this Revolving Loan Promissory Note.

Each Company confirms that any amount received by or paid to the Agent in
connection with this Agreement and/or any balances standing to its credit on any
of its accounts on the Agent's books under this Agreement may in accordance with
the terms of this Agreement be applied in reduction of this Revolving Loan
Promissory Note, but no balance or amounts shall be deemed to effect payment in
whole or in part of this Revolving Loan Promissory Note unless the Agent shall
have actually charged such account or accounts for the purposes of such
reduction or payment of this Revolving Loan Promissory Note.

Upon the occurrence and during the continuance of any one or more of the Events
of Default specified in the Agreement or upon termination of this Agreement, all
amounts then remaining unpaid on this Revolving Loan Promissory Note may become,
or be declared to be, immediately due and payable as provided in the Agreement.

Each Company and the Guarantors, sureties and endorses jointly and severally
waive grace, demand, presentment for payment, notice of dishonor or default,
notice of intent to accelerate, notice of acceleration, protest and diligence in
collecting this Revolving Loan Promissory Note.

                                               UTI - LOAN AND SECURITY AGREEMENT

                                      A-2
<PAGE>   97

This Revolving Loan Promissory Note shall be governed by, and construed in
accordance with, the laws of the State of New York and the applicable federal
laws of the United States.

                                   COMPANIES:

                                   UTI DRILLING, L.P.

                                   By: UTICO HARD ROCK BORING, INC.,
                                       As Sole General Partner

                                       By:
                                          --------------------------------------
                                          John E. Vollmer III, Vice President

                                   SUITS DRILLING COMPANY
                                   UNIVERSAL WELL SERVICES, INC.
                                   NORTON DRILLING COMPANY

                                   By:
                                      -----------------------------------------
                                      John E. Vollmer III, Vice President

                                   UTI MANAGEMENT SERVICES, L.P.

                                   By: UTICO HARD ROCK BORING,
                                       As Sole General Partner

                                       By:
                                          -------------------------------------
                                          John E. Vollmer III, Vice President

                                               UTI - LOAN AND SECURITY AGREEMENT
<PAGE>   98

                                SCHEDULE TO GRID

<Table>
<Caption>

             Date         Loan            Payment            Balance

<S>                       <C>             <C>                <C>

-------------------------------------------------------------------------------

-------------------------------------------------------------------------------

-------------------------------------------------------------------------------

-------------------------------------------------------------------------------

</Table>

                                               UTI - LOAN AND SECURITY AGREEMENT

<PAGE>   99

                                    EXHIBIT B

                        ASSIGNMENT AND TRANSFER AGREEMENT

                           Dated:                , 199
                                  ---------------

Reference herein is made to the Loan and Security Agreement dated as of November
22, 1999 (as amended, modified, supplemented and in effect from time to time,
the "AGREEMENT"), among UTI ENERGY CORP. AND ITS SUBSIDIARIES, collectively (the
"COMPANY"), the Lenders named therein, and The CIT Group/Business Credit, Inc.,
as Agent (the "AGENT"). Capitalized terms used herein and not otherwise defined
shall have the meanings assigned to such terms in this Agreement. This
Assignment and Transfer Agreement, between the Assignor (as defined and set
forth on Schedule 1 hereto and made a part hereof) and the Assignee (as defined
and set forth on Schedule 1 hereto and made a part hereof) is dated as of Date
hereof (as set forth on Schedule 1 hereto and made a part hereof).

         1. The Assignor hereby irrevocably sells and assigns to the Assignee
without recourse to the Assignor, and the Assignee hereby irrevocably purchases
and assumes from the Assignor without recourse to the Assignor, as of the Date
hereof, an undivided interest (the "ASSIGNED INTEREST") in and to all the
Assignor's rights and obligations under this Agreement respecting those, and
only those, financing facilities contained in this Agreement as are set forth on
Schedule 1 (collectively, the "ASSIGNED FACILITIES" and individually, an
"ASSIGNED FACILITY"), in a principal amount for each Assigned Facility as set
forth on Schedule 1.

         2. The Assignor (i) makes no representation or warranty and assumes no
responsibility with respect to any statements, warranties or representations
made in or in connection with this Agreement or any other instrument, document
or agreement executed in conjunction therewith (collectively the "LOAN
DOCUMENTS") or the execution, legality, validity, enforceability, genuineness,
sufficiency or value of this Agreement, any Collateral thereunder or any of the
Loan Documents furnished pursuant thereto, other than that it is the legal and
beneficial owner of the interest being assigned by it hereunder and that such
interest is free and clear of any adverse claim and (ii) makes no representation
or warranty and assumes no responsibility with respect to the financial
condition of each Company or any guarantor or the performance or observance by
each Company or any guarantor of any of its respective obligations under this
Agreement or any of the Loan Documents furnished pursuant thereto.

         3. The Assignee (i) represents and warrants that it is legally
authorized to enter into this Assignment and Transfer Agreement; (ii) confirms
that it has received a copy of this Agreement, together with the copies of the
most recent financial statements of each Company, and such other documents and
information as it has deemed appropriate to make its own credit analysis; (iii)
agrees that it will, independently and without reliance upon the Agent, the
Assignor or any other Lender and based on such documents and information as it
shall deem appropriate at the time, continue to make its own credit decisions in
taking or not taking action under this Agreement; (iv) appoints and authorizes
the Agent to take such action as agent on its behalf and to exercise such powers
under this

                                               UTI - LOAN AND SECURITY AGREEMENT

                                      B-1
<PAGE>   100
Agreement as are delegated to the Agent by the terms thereof, together with such
powers as are reasonably incidental thereto; (v) agrees that it will be bound by
the provisions of this Agreement and will perform in accordance with its terms
all the obligations which by the terms of this Agreement are required to be
performed by it as Lender; and (vi) if the Assignee is organized under the laws
of a jurisdiction outside the United States, attaches the forms prescribed by
the Internal Revenue Service of the United States certifying as to the
Assignee's exemption from United States withholding taxes with respect to all
payments to be made to the Assignee under this Agreement or such other documents
as are necessary to indicate that all such payments are subject to such tax at a
rate reduced by an applicable tax treaty.

         4. Following the execution of this Assignment and Transfer Agreement,
such agreement will be delivered to the Agent for acceptance by it and each
Company, effective as of the Date hereof.

         5. Upon such acceptance, from and after the Date hereof, the Agent
shall make all payments in respect of the assigned interest (including payments
of principal, interest, fees and other amounts) to the Assignee, whether such
amounts have accrued prior to the Date hereof or accrue subsequent to the Date
hereof. The Assignor and Assignee shall make all appropriate adjustments in
payments for periods prior to the Date hereof made by the Agent or with respect
to the making of this assignment directly between themselves.

         6. From and after the Date hereof, (i) the Assignee shall be a party to
this Agreement and, to the extent provided in this Assignment and Transfer
Agreement, have the rights and obligations of a Lender thereunder, and (ii) the
Assignor shall, to the extent provided in this Assignment and Transfer
Agreement, relinquish its rights and be released from its obligations under this
Agreement.

         7. THIS ASSIGNMENT AND TRANSFER AGREEMENT SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                      B-2
<PAGE>   101

         IN WITNESS WHEREOF, the parties hereto have caused this Assignment and
Acceptance to be executed by their respective duly authorized officers on the
date first written above.

THE CIT GROUP/BUSINESS
CREDIT, INC., AS AGENT
                                               as Assignor

By:                                            By:
    ----------------------------                  ------------------------------
Title:                                         Title:
       -------------------------                     ---------------------------

--------------------------------               ---------------------------------
 (the "Company")                               as Assignee

By:                                            By:
    ----------------------------                  ------------------------------
Title:                                         Title:
       -------------------------                     ---------------------------

                                               UTI - LOAN AND SECURITY AGREEMENT

                                      B-1
<PAGE>   102

                 SCHEDULE 1 TO ASSIGNMENT AND TRANSFER AGREEMENT

Name of Assignor:
                  ------------------------------

Name of Assignee:
                  ------------------------------

Date hereof of Assignment:                  , 199       /200
                           -----------------      ------     ------

<Table>
<Caption>
                                                       Percentage Assigned of
                                                       Each Facility (Shown
                                                       as a percentage of
                               Principal               aggregate original
Assigned                       Amount                  principal amount
Facilities                     Assigned                of all Lenders)
----------                     --------                --------------
<S>                        <C>                         <C>

Revolving Loans            $                                    %
                            ----------------           ---------
</Table>

                                   SCHEDULE 1

                                               UTI - LOAN AND SECURITY AGREEMENT
<PAGE>   103

                           SCHEDULE 1 - EXISTING LIENS

<Table>
<Caption>

                          FILING     FILING       SECURED
LOCATION      COMPANY     NUMBER     DATE         PARTY             COLLATERAL
--------      -------     ------     ------       -------           ----------
<S>           <C>         <C>        <C>          <C>               <C>

</Table>

                                   SCHEDULE 1

                                               UTI - LOAN AND SECURITY AGREEMENT
<PAGE>   104

          SCHEDULE 2 - COLLATERAL LOCATIONS AND CHIEF EXECUTIVE OFFICE

CHIEF EXECUTIVE OFFICE

COLLATERAL LOCATIONS

                                               UTI - LOAN AND SECURITY AGREEMENT

                                       E-1<PAGE>   1
                                                                  EXHIBIT 10.1.1

                 FIRST AMENDMENT TO LOAN AND SECURITY AGREEMENT

     THIS FIRST AMENDMENT TO LOAN AND SECURITY AGREEMENT (this "Amendment") is
made and entered into as of this 2nd day of May, 2000, by and between THE CIT
GROUP/BUSINESS CREDIT, INC. a New York corporation (hereinafter "CITBC"), in its
individual capacity and as Agent for the Lenders hereinafter named (hereinafter
the "AGENT"), Foothill Capital Corporation, a California corporation ("FCC"),
GMAC Business Credit, LLC, a Michigan limited liability company ("GMAC"), and
any other party hereafter becoming a Lender pursuant to Section 13, Paragraph 9
of the Agreement (as hereinafter defined), each individually sometimes referred
to as a "LENDER" and collectively the "LENDERS"), and UTI Drilling, L.P., a
Texas limited partnership ("UTI"), Norton Drilling, L.P., a Delaware limited
partnership, as successor in interest by conversion to Norton Drilling Company,
a Delaware corporation ("NDLP"), Universal Well Services, Inc., a Delaware
corporation ("UWSI"), UTI Management Services, L.P., a Texas limited partnership
("UTIMS"), and Suits Drilling Company, an Oklahoma corporation ("SDC"), (UTI,
NDLP, UWSI, UTIMS and SDC, together with any additional entities which may
become a Company under the Agreement from time to time, being referred to herein
individually, as a "COMPANY", and collectively, as the "COMPANIES"), and UTI
Drilling Canada, Inc., a Delaware corporation ("UTI CANADA").

                                    RECITALS

     A. WHEREAS, pursuant to the terms and subject to the conditions of that
certain Loan Agreement and Security Agreement dated as of November 22, 1999
between the parties hereto (such Loan and Security Agreement, as the same is
hereby amended and may hereafter be amended from time to time, being hereinafter
referred to as the "Agreement"), the Companies were granted a $65,000,000
revolving line of credit which included a letter of credit facility;

     B. WHEREAS, the indebtedness of the Companies to the Lenders is currently
evidenced by that certain Revolving Loan Promissory Note dated November 22, 1999
(the "Initial Revolving Note"), executed by the Companies and payable to CITBC
as Agent for the benefit of the Lenders;

     C. WHEREAS, payment of the Obligations of the Companies was supported by
the guaranties of UTI Energy Corp., a Delaware corporation (the "PARENT"),
UTICO, Inc., a Delaware corporation ("HOLDING"), UTICO Hard Rock Boring, Inc., a
Delaware corporation ("UHRB"), International Petroleum Services Company, a
Pennsylvania corporation ("IPSCO"), Norton Drilling Services, Inc., a Delaware
corporation ("NDS"), and Norton Drilling Company Mexico, Inc., a Delaware
corporation ("NDM") (Parent, Holding, UHRB, IPSCO, NDS and NDM are referred to
herein, individually, as a "GUARANTOR", and collectively, as the "GUARANTORS");

     D. WHEREAS, to secure, in part, the indebtedness under the Agreement and
the Revolving Note (and all renewals, extensions, modifications and/or
rearrangements thereof and in connection therewith) and all other indebtedness,
liabilities and obligations of the Companies to the Agent for the benefit of the
Lenders, then existing or thereafter arising, (i) the Companies have heretofore
executed in favor of the Agent certain Loan Documents (as defined in the
Agreement), including, without limitation, the Guaranty, (as defined in the
Agreement), which Loan Documents (as defined in the Agreement) shall continue as
amended in connection herewith in full force and effect

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT - Page 1
<PAGE>   2

upon the execution of this Amendment, all of the Loan Documents to continue to
secure the payment by the Companies of the Obligations (as defined in the
Agreement) all as more fully set forth therein and herein;

     E. WHEREAS, the Companies have requested a waiver of certain Events of
Default under the Agreement;

     F. WHEREAS, in furtherance of the foregoing and to evidence the agreements
of the parties hereto in relation thereto the parties hereto desire to amend the
Agreement as hereinafter provided;

     NOW, THEREFORE, in consideration of the premises herein contained and other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties, intending to be legally bound, agree as follows:

                                    AGREEMENT

                                    ARTICLE I
                                   DEFINITIONS

     1.01 Capitalized terms used in this Amendment are defined in the Agreement,
as amended hereby, unless otherwise stated.

                                   ARTICLE II
                             AMENDMENTS TO AGREEMENT

     Effective as of the respective date herein indicated, the Agreement is
hereby amended as follows:

     2.01 AMENDMENT AND REPLACEMENT OF NORTON DRILLING COMPANY AND THE
DEFINITION NDC. Effective as of the date of execution of this Amendment, (i) the
reference to "Norton Drilling Company, a Delaware corporation ("NDC")" in the
preamble to the Agreement is hereby deleted and replaced with "Norton Drilling,
L.P., a Delaware limited partnership, successor in interest by conversion to
Norton Drilling Company, a Delaware corporation ("NDLP")", and (ii) all
references to the term "NDC" in the Agreement shall be deleted and replaced with
the term "NDLP".

     2.02 AMENDMENT OF DEFINITION OF "GUARANTOR" AND "GUARANTORS". Effective as
of the date of execution of this Amendment, the references to "Guarantor" and
"Guarantors" in the preamble to the Agreement shall be amended to include UTI
Canada.

     2.03 AMENDMENT AND RESTATEMENT OF EXHIBIT A TO THE AGREEMENT. Effective as
of the date of execution of this Amendment, Exhibit A to the Agreement is
amended and restated in its entirety as set forth on Exhibit A attached hereto.

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT - Page 2
<PAGE>   3

                                   ARTICLE III
          ASSUMPTION OF OBLIGATIONS AND RATIFICATION AND GRANT OF LIENS

     3.01 ASSUMPTION OF OBLIGATIONS. Effective December 31, 1999, NDC converted
from a Delaware corporation to a Delaware limited partnership and changed its
name to Norton Drilling, L.P. (collectively, the "Conversion"). NDLP hereby
acknowledges and agrees that as result of the Conversion, by operation of law,
NDLP is liable for all Obligations of NDC, and NDLP hereby assumes all
Obligations of NDC as of December 31, 1999 and all Obligations incurred
thereafter (including, without limitation, the indebtedness and obligations
under the Initial Revolving Note, the Agreement and the other Loan Documents).

     3.02 RATIFICATION AND GRANT OF LIEN. NDLP hereby acknowledges and agrees
that as a result of the Conversion, by operation of law, NDLP became the owner
of all the assets of NDC as of December 31, 1999. NDLP also acknowledges and
agrees that such assets were pledged by NDC as Collateral under the Agreement
and that after the Conversion, by operation of law, such assets remained
Collateral under the Agreement and subject to the lien granted thereunder to
Agent on behalf of the Lenders. NDLP hereby grants to Agent for the benefit of
the Lenders a security interest in all Collateral now or hereafter owned by NDLP
pursuant to the terms and provisions of Section 6 of the Agreement and
acknowledges and agrees that the security interest granted hereunder in any
assets previously owned by NDC is a renewal and continuation of the security
interest in such assets previously granted by NDC under the Agreement.

     3.03 ASSUMPTION OF OBLIGATIONS AND DUTIES UNDER THE AGREEMENT. NDLP hereby
(a) reaffirms all representations and warranties made by NDC under the Agreement
and the other Loan Documents to which NDC was a party, (b) assumes all
covenants, obligations and duties of NDC under the Agreement and the other Loan
Documents to which NDC was a party, and (c) agrees to be bound by the terms and
provisions of the Agreement as a Company and Obligor thereunder and to be bound
by the terms and provisions of the other Loan Documents to which NDC was a party
to the same extent and with the same force and effect as if NDLP had been named
as NDC in each of the Loan Documents.

     3.04 ASSUMPTION OF OBLIGATIONS AND GRANT OF LIEN BY UTI CANADA. Effective
as of the date of this Amendment, UTI Canada agrees (i) to be a Guarantor and
Obligor under the Agreement and a Guarantor under that certain Guaranty
Agreement dated November 22, 1999 executed by the Guarantors for the benefit of
CITBC and the other Lenders (the "Guaranty Agreement"), (ii) to be bound by the
terms and provisions of the Agreement as a Guarantor and Obligor thereunder and
to be bound by the terms of the Guaranty Agreement as a Guarantor thereunder to
the same extent and with the same force and effect as if UTI Canada had been
originally named as a party in each of such documents, (iii) to assume all
covenants, agreements and duties as a Guarantor and Obligor under the Agreement
and as a Guarantor under the Guaranty Agreement. UTI Canada also hereby grants
to Agent for the benefit of the Lenders a security interest in all Collateral
now or hereafter owned by UTI Canada pursuant to the terms of Section 6 of the
Agreement.

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT - Page 3
<PAGE>   4

                                   ARTICLE IV
                              CONDITIONS PRECEDENT

     4.01 CONDITIONS TO EFFECTIVENESS. The effectiveness of this Amendment is
subject to the satisfaction of the following conditions precedent in a manner
satisfactory to CITBC, unless specifically waived in writing by CITBC:

         (a) CITBC shall have received each of the following, each in form and
substance satisfactory to CITBC, in its sole discretion, and, where applicable,
each duly executed by each party thereto, other than CITBC:

               (i) This Amendment, duly executed by Companies and the Consent,
     Ratification and Release is executed by the Guarantors;

               (ii) A Revolving Loan Promissory Note in the stated principal
     amount of $65,000,000 in amendment, substitution and replacement of the
     Initial Revolving Note duly signed by the Companies; and

               (iii) certified copies of the resolutions of the Board of
     Directors of each of the Companies and the Guarantors authorizing the
     execution, delivery and performance of this Amendment and any and all other
     Loan Documents executed by any of the Companies or the Guarantors in
     connection therewith, along with a certificate of incumbency certified by
     the secretary of each of the Companies and the Guarantors with specimen
     signatures of the officers of the Companies and the Guarantors who are
     authorized to sign such documents, all in form and substance satisfactory
     to the Agent; and

               (iv) Pledge Agreement signed by UTI Drilling Canada, Inc., a
     Delaware corporation ("UTI Canada"), granting to the Agent on behalf of the
     Lenders (1) a collateral assignment of the promissory note payable by
     Phelps Drilling Co. ("PDC") to UTI Canada in the stated principal amount of
     $30,000,000 (the "Intercompany Note"), and the liens securing the
     Intercompany Note, and (2) pledging 66% of its ownership interest in PDC.
     The Intercompany Note evidences a loan which is to be used by PDC to
     acquire all of the drilling assets of Phelps Drilling International, Ltd.,
     584022 Alberta Ltd. and 700392 Alberta Ltd. (collectively, the
     "Acquisitions"). Agent must also receive the original of the Intercompany
     Note duly endorsed to the Agent; and

               (v) Pledge Amendment duly signed NDS pledging all of its
     ownership interest in NDLP; and

               (vi) Pledge Amendment duly signed UTI pledging all of its
     ownership interest in UTI Canada; and

               (vii) Pledge Agreement duly signed Norton GP, L.L.C. pledging all
     of its ownership interest in NDLP; and

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT - Page 4
<PAGE>   5

               (viii) Opinion from Fullbright & Jaworski, L.L.P. opining that
     the execution, delivery and performance of the Acquisition Agreements does
     not violate or result in a breach of or default under the Agreement or any
     other material agreements to which any of the Obligors is a party; and

               (ix) Opinion from Borrower's Canadian counsel opining that (1)
     PDC has the power and authority to execute, deliver and perform the
     Intercompany Note and the related security agreement and other documents
     (collectively, the "PDC Loan Documents"), (2) the PDC Loan Documents have
     been authorized by all necessary corporate action, and (3) the PDC Loan
     Documents are valid, legal and binding obligations of PDC and are
     enforceable against PDC, such opinion to be delivered to CITBC within 10
     business days from the date of this Amendment; and

               (x) Copy of the executed asset purchase agreements which evidence
     the Acquisitions (collectively, the "Acquisition Agreements"); and

               (xi) All other documents CITBC may request with respect to any
     matter relevant to this Amendment or the transactions contemplated hereby.

         (b) The representations and warranties contained herein and in the
Agreement and the other documents executed in connection with the Agreement
(herein referred to as "Loan Documents"), as each is amended hereby, shall be
true and correct as of the date hereof, as if made on the date hereof, except
for such representations and warranties as are by their express terms limited to
a specific date.

         (c) No Default or Event of Default shall have occurred and be
continuing, unless such Default or Event of Default has been otherwise
specifically waived in writing by CITBC.

         (d) All corporate proceedings taken in connection with the transactions
contemplated by this Amendment and all documents, instruments and other legal
matters incident thereto shall be satisfactory to CITBC.

                                    ARTICLE V
           LIMITED CONSENT AND WAIVER AND RELEASE OF PLEDGE AGREEMENTS

     5.01 LIMITED CONSENT TO AND WAIVER REGARDING CHANGE OF NAME AND CONVERSION.
The Companies have informed Agent and the other Lenders that the Companies are
in default under the Agreement (a) for failure to timely notify the Agent and
the other Lenders of the Conversion and for failure to deliver to Agent prior to
the Conversion any documents, agreements or financing statements to confirm the
continuation and perfection of all of Lenders' security interests, as required
by Section 7, Subparagraph 10(E) of the Agreement, and (b) for failure to timely
notify the Agent of such Defaults and Events of Default as required under the
Agreement. Pursuant to the request of the Companies, the Agent and the other
Lenders hereby waive any such Defaults or Events of Default described in the
preceding sentence, such waiver being subject to the satisfaction of the
conditions precedent in Article IV of this Amendment and to the other terms,
conditions and provisions of this Amendment. There are

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT - Page 5
<PAGE>   6

no other waivers granted by Lender relating to the Agreement except the waiver
specifically set forth in this Section 5.01 and the above waiver is effective
only in the specific instances and for the purposes for which given.

     5.02 NO OTHER WAIVERS. Except as otherwise specifically provided for in
this Amendment, nothing contained herein shall be construed as a waiver by CITBC
of any covenant or provision of the Agreement, the other Loan Documents, this
Amendment or any other contract or instrument between Companies and CITBC, and
the failure of CITBC at any time or times hereafter to require strict
performance by Companies of any provision thereof shall not waive, affect or
diminish any right of CITBC to thereafter demand strict compliance therewith.
CITBC hereby reserves all rights granted under the Agreement, the other Loan
Documents, this Amendment, and any other contract or instrument between
Companies and CITBC.

                                   ARTICLE VI
                  RATIFICATIONS, REPRESENTATIONS AND WARRANTIES

     6.01 RATIFICATIONS. The terms and provisions set forth in this Amendment
shall modify and supersede all inconsistent terms and provisions set forth in
the Agreement and the other Loan Documents, and, except as expressly modified
and superseded by this Amendment, the terms and provisions of the Agreement and
the other Loan Documents are ratified and confirmed and shall continue in full
force and effect. Companies and CITBC agree that the Agreement and the other
Loan Documents, as amended hereby, shall continue to be legal, valid, binding
and enforceable in accordance with their respective terms.

     6.02 REPRESENTATIONS AND WARRANTIES. Companies hereby represent and warrant
to CITBC that (a) the execution, delivery and performance of this Amendment and
any and all other Loan Documents executed and/or delivered in connection
herewith have been authorized by all requisite corporate action on the part of
Companies and will not violate the Articles of Incorporation or Bylaws of
Companies; (b) each Company's Boards of Directors have authorized the execution,
delivery and performance of this Amendment and any and all other Loan Documents
executed and/or delivered in connection herewith; (c) the representations and
warranties contained in the Agreement, as amended hereby, and any other Loan
Document are true and correct on and as of the date hereof and on and as of the
date of execution hereof as though made on and as of each such date; (d) no
Default or Event of Default under the Agreement, as amended hereby, has occurred
and is continuing, unless such Default or Event of Default has been specifically
waived in writing by CITBC; (e) Companies are in full compliance with all
covenants and agreements contained in the Agreement and the other Loan
Documents, as amended hereby; and (f) Companies have not amended their Articles
of Incorporation or their Bylaws, or agreement of limited partnership, as
applicable, since the date of the Agreement.

                                   ARTICLE VII
                            MISCELLANEOUS PROVISIONS

     7.01 SURVIVAL OF REPRESENTATIONS AND WARRANTIES. All representations and
warranties made in the Agreement or any other Loan Document, including, without
limitation, any document furnished in connection with this Amendment, shall
survive the execution and delivery of this

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT - Page 6
<PAGE>   7

Amendment and the other Loan Documents, and no investigation by CITBC or any
closing shall affect the representations and warranties or the right of CITBC to
rely upon them.

     7.02 REFERENCE TO AGREEMENT. Each of the Agreement and the other Loan
Documents, and any and all other Loan Documents, documents or instruments now or
hereafter executed and delivered pursuant to the terms hereof or pursuant to the
terms of the Agreement, as amended hereby, are hereby amended so that any
reference in the Agreement and such other Loan Documents to the Agreement shall
mean a reference to the Agreement, as amended hereby.

     7.03 EXPENSES OF CITBC. As provided in the Agreement, Companies agree to
pay on demand all costs and expenses incurred by CITBC in connection with the
preparation, negotiation, and execution of this Amendment and the other Loan
Documents executed pursuant hereto and any and all amendments, modifications,
and supplements thereto, including, without limitation, the costs and fees of
CITBC's legal counsel, and all costs and expenses incurred by CITBC in
connection with the enforcement or preservation of any rights under the
Agreement, as amended hereby, or any other Loan Documents, including, without,
limitation, the costs and fees of CITBC's legal counsel.

     7.04 SEVERABILITY. Any provision of this Amendment held by a court of
competent jurisdiction to be invalid or unenforceable shall not impair or
invalidate the remainder of this Amendment and the effect thereof shall be
confined to the provision so held to be invalid or unenforceable.

     7.05 SUCCESSORS AND ASSIGNS. This Amendment is binding upon and shall inure
to the benefit of CITBC and Companies and their respective successors and
assigns, except that Companies may not assign or transfer any of their rights or
obligations hereunder without the prior written consent of CITBC.

     7.06 COUNTERPARTS. This Amendment may be executed in one or more
counterparts, each of which when so executed shall be deemed to be an original,
but all of which when taken together shall constitute one and the same
instrument.

     7.07 EFFECT OF WAIVER. No consent or waiver, express or implied, by CITBC
to or for any breach of or deviation from any covenant or condition by Companies
shall be deemed a consent to or waiver of any other breach of the same or any
other covenant, condition or duty.

     7.08 HEADINGS. The headings, captions, and arrangements used in this
Amendment are for convenience only and shall not affect the interpretation of
this Amendment.

     7.09 APPLICABLE LAW. THIS AMENDMENT AND ALL OTHER LOAN DOCUMENTS EXECUTED
PURSUANT HERETO SHALL BE DEEMED TO HAVE BEEN MADE AND TO BE PERFORMABLE IN AND
SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF
NEW YORK.

     7.10 FINAL AGREEMENT. THE AGREEMENT AND THE OTHER LOAN DOCUMENTS, EACH AS
AMENDED HEREBY, REPRESENT THE ENTIRE EXPRESSION OF THE PARTIES WITH RESPECT TO
THE SUBJECT MATTER HEREOF ON THE DATE THIS AMENDMENT IS EXECUTED. THE AGREEMENT
AND THE OTHER LOAN DOCUMENTS, AS AMENDED

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT - Page 7
<PAGE>   8

HEREBY, MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR
SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL
AGREEMENTS BETWEEN THE PARTIES. NO MODIFICATION, RESCISSION, WAIVER, RELEASE OR
AMENDMENT OF ANY PROVISION OF THIS AMENDMENT SHALL BE MADE, EXCEPT BY A WRITTEN
AGREEMENT SIGNED BY COMPANIES AND CITBC.

     7.11 RELEASE. COMPANIES HEREBY ACKNOWLEDGE THAT THEY HAVE NO DEFENSE,
COUNTERCLAIM, OFFSET, CROSS-COMPLAINT, CLAIM OR DEMAND OF ANY KIND OR NATURE
WHATSOEVER THAT CAN BE ASSERTED TO REDUCE OR ELIMINATE ALL OR ANY PART OF ITS
LIABILITY TO REPAY THE "OBLIGATIONS" OR TO SEEK AFFIRMATIVE RELIEF OR DAMAGES OF
ANY KIND OR NATURE FROM CITBC. COMPANIES HEREBY VOLUNTARILY AND KNOWINGLY
RELEASE AND FOREVER DISCHARGE CITBC, ITS PREDECESSORS, AGENTS, EMPLOYEES,
SUCCESSORS AND ASSIGNS, FROM ALL POSSIBLE CLAIMS, DEMANDS, ACTIONS, CAUSES OF
ACTION, DAMAGES, COSTS, EXPENSES, AND LIABILITIES WHATSOEVER, KNOWN OR UNKNOWN,
ANTICIPATED OR UNANTICIPATED, SUSPECTED OR UNSUSPECTED, FIXED, CONTINGENT, OR
CONDITIONAL, AT LAW OR IN EQUITY, ORIGINATING IN WHOLE OR IN PART ON OR BEFORE
THE DATE THIS AMENDMENT IS EXECUTED, WHICH COMPANIES MAY NOW OR HEREAFTER HAVE
AGAINST CITBC, ITS PREDECESSORS, AGENTS, EMPLOYEES, SUCCESSORS AND ASSIGNS, IF
ANY, AND IRRESPECTIVE OF WHETHER ANY SUCH CLAIMS ARISE OUT OF CONTRACT, TORT,
VIOLATION OF LAW OR REGULATIONS, OR OTHERWISE, AND ARISING FROM ANY "LOANS",
INCLUDING, WITHOUT LIMITATION, ANY CONTRACTING FOR, CHARGING, TAKING, RESERVING,
COLLECTING OR RECEIVING INTEREST IN EXCESS OF THE HIGHEST LAWFUL RATE
APPLICABLE, THE EXERCISE OF ANY RIGHTS AND REMEDIES UNDER THE AGREEMENT OR OTHER
LOAN DOCUMENTS, AND NEGOTIATION FOR AND EXECUTION OF THIS AMENDMENT.

              [The Remainder of this Page Intentionally Left Blank]

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT - Page 8
<PAGE>   9

     IN WITNESS WHEREOF, this Amendment has been executed and is effective as of
the date first above-written.

                         COMPANIES:

                         UTI DRILLING, L.P.

                         By: Utico Hard Rock Boring, Inc., its sole general
                         partner

                                 By:
                                     -------------------------------------------
                                 Name: John E. Vollmer, III
                                 Title: Vice President

                         UTI MANAGEMENT SERVICES, L.P.

                         By: Utico Hard Rock Boring, Inc., its sole general
                         partner

                                 By:
                                     -------------------------------------------
                                 Name: John E. Vollmer, III
                                 Title: Vice President

                         NORTON DRILLING,  L.P., as successor in
                         interest (by conversion) to Norton Drilling Company

                         By: Norton GP, L.L.C., as sole General Partner,

                             By: Norton Drilling Services, Inc., its sole member

                                 By:
                                     -------------------------------------------
                                 Name:
                                       -----------------------------------------
                                 Title:
                                        ----------------------------------------

                         UNIVERSAL WELL SERVICES, INC.

                                 By:
                                     -------------------------------------------
                                 Name: John E. Vollmer, III
                                 Title: Vice President

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT
<PAGE>   10

                                       SUITS DRILLING COMPANY

                                               By:
                                                   -----------------------------
                                               Name: John E. Vollmer, III
                                               Title: Vice President

                                       UTI CANADA:

                                       UTI DRILLING CANADA, INC.

                                       By:
                                           -------------------------------------
                                       Name:
                                             -----------------------------------
                                       Title:
                                              ----------------------------------

                                       LENDERS:

                                       THE CIT GROUP/BUSINESS CREDIT,INC.
                                       as Agent and Lender

                                       By:
                                           -------------------------------------
                                       Name:
                                             -----------------------------------
                                       Title:
                                              ----------------------------------

                                       GMAC BUSINESS CREDIT, LLC
                                       as Syndication Agent and Lender

                                       By:
                                           -------------------------------------
                                       Name:
                                             -----------------------------------
                                       Title:
                                              ----------------------------------

                                       FOOTHILL CAPITAL CORPORATION
                                       as Documentation Agent and Lender

                                       By:
                                           -------------------------------------
                                       Name:
                                             -----------------------------------
                                       Title:
                                              ----------------------------------

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT
<PAGE>   11

                        CONSENT, RATIFICATION AND RELEASE

     The undersigned each hereby consents to the terms of the within and
foregoing Amendment, confirms and ratifies the terms of that certain Guaranty
Agreement dated November 22, 1999 executed by the undersigned for the benefit of
Agent and the other Lenders (the "Guaranty Agreement"), and acknowledges that
the Guaranty Agreement is in full force and effect and ratifies the same, that
the undersigned each has no defense, counterclaim, set-off or any other claim to
diminish the undersigned's liability under such document, that the undersigned's
consent is not required to the effectiveness of the within and foregoing
Amendment, and that no consent by the undersigned is required for the
effectiveness of any future amendment, modification, forbearance or other action
with respect to the Obligations, the Collateral, or any of the other Loan
Agreements. THE UNDERSIGNED EACH HEREBY VOLUNTARILY AND KNOWINGLY RELEASES AND
FOREVER DISCHARGES LENDER, ITS PREDECESSORS, AGENTS, EMPLOYEES, SUCCESSORS AND
ASSIGNS, FROM ALL POSSIBLE CLAIMS, DEMANDS, ACTIONS, CAUSES OF ACTION, DAMAGES,
COSTS, EXPENSES, AND LIABILITIES WHATSOEVER, KNOWN OR UNKNOWN, ANTICIPATED OR
UNANTICIPATED, SUSPECTED OR UNSUSPECTED, FIXED, CONTINGENT, OR CONDITIONAL, AT
LAW OR IN EQUITY, ORIGINATING IN WHOLE OR IN PART ON OR BEFORE THE DATE THIS
AMENDMENT IS EXECUTED, WHICH THE UNDERSIGNED MAY NOW OR HEREAFTER HAVE AGAINST
LENDER, ITS PREDECESSORS, AGENTS, EMPLOYEES, SUCCESSORS AND ASSIGNS, IF ANY, AND
IRRESPECTIVE OF WHETHER ANY SUCH CLAIMS ARISE OUT OF CONTRACT, TORT, VIOLATION
OF LAW OR REGULATIONS, OR OTHERWISE, AND ARISING FROM ANY "LOANS", INCLUDING,
WITHOUT LIMITATION, ANY CONTRACTING FOR, CHARGING, TAKING, RESERVING, COLLECTING
OR RECEIVING INTEREST IN EXCESS OF THE HIGHEST LAWFUL RATE APPLICABLE, THE
EXERCISE OF ANY RIGHTS AND REMEDIES UNDER THE LOAN AGREEMENT OR OTHER
AGREEMENTS, AND NEGOTIATION FOR AND EXECUTION OF THIS AMENDMENT.

GUARANTORS:                                 UTICO, INC.

UTICO HARD ROCK BORING, INC.
NORTON DRILLING COMPANY                     By:
         MEXICO, INC.                           --------------------------------
INTERNATIONAL PETROLEUM                     Kenneth J. Kubacki
          SERVICES COMPANY                  Vice President and Treasurer

                                            UTI ENERGY CORP.
By:
    ------------------------------------
John E. Vollmer III, Vice President
signing as such on behalf of each of the    By:
foregoing Obligors                              --------------------------------
                                            John E. Vollmer III
                                            Senior Vice President

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT
<PAGE>   12

                                    EXHIBIT A
                         REVOLVING LOAN PROMISSORY NOTE

                                   May 2, 2000

$65,000,000

FOR VALUE RECEIVED, the undersigned Companies (each a "COMPANY" and,
collectively, the "COMPANIES"), promise, jointly and severally, to pay to the
order of THE CIT GROUP/BUSINESS CREDIT, INC. (herein "CITBC"), as Agent for the
Lenders under a certain Loan and Security Agreement dated November 22, 1999
between CITBC as Agent and Lender, other Lenders parties thereto and each
Company, as amended from time to time (herein the "AGREEMENT") at its office
located at 1211 Avenue of the Americas, New York, New York 10036, or such other
address as may be designated by the Agent, in lawful money of the United States
of America and in immediately available funds, the principal amount of Sixty
Five Million and No/100 Dollars ($65,000,000), or such other principal amount
advanced pursuant to Section 3, Paragraph 1 or Section 4 of the Agreement. The
balance of such Revolving Loan will fluctuate as a result of the daily
application of the proceeds of collections of the Accounts and the making of
additional Revolving Loans as described in said Section 3 or Section 4 of the
Agreement. The Revolving Loans may be borrowed, repaid and reborrowed by any
Company, subject to the terms of the Agreement. A final payment in an amount
equal to the outstanding aggregate balance of principal and interest remaining
unpaid, if any, under this Revolving Loan Promissory Notes as shown on the books
and records of the Agent shall be due and payable upon any termination of the
Agreement.

All capitalized terms used herein shall have the meaning provided therefor in
this Agreement, unless otherwise defined herein.

The Companies further promise, jointly and severally, to pay interest at such
office, in like money, on the unpaid principal amount owing hereunder from time
to time from the date hereof on the dates and at the rates specified in Section
8, Paragraph 1 of the Agreement.

If any payment on this Revolving Loan Promissory Note becomes due and payable on
a day other than a Business Day, the maturity thereof shall be extended to the
next succeeding Business Day, and with respect to payments of principal,
interest thereon shall be payable at the then applicable rate during such
extension.

This Revolving Loan Promissory Note is a Revolving Loan Promissory Note referred
to in the Agreement, and is subject to, and entitled to, all provisions and
benefits thereof and is subject to optional and mandatory prepayment, in whole
or in part, as provided therein.

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT
<PAGE>   13

The date and amount of the advance(s) made hereunder may be recorded on the
schedule which is attached hereto and hereby made part of this Note or the
separate ledgers maintained by the Agent, provided that any failure to record
any such information on such schedule shall not in any manner affect the
obligation of any Company to make payments of principal and interest in
accordance with the terms of this Revolving Loan Promissory Note. The aggregate
unpaid principal amount of all advances made pursuant hereto may be set forth in
the balance column on said schedule or such ledgers maintained by the Agent. All
such advances, whether or not so recorded, shall be due as part of this
Revolving Loan Promissory Note.

Each Company confirms that any amount received by or paid to the Agent in
connection with this Agreement and/or any balances standing to its credit on any
of its accounts on the Agent's books under this Agreement may in accordance with
the terms of this Agreement be applied in reduction of this Revolving Loan
Promissory Note, but no balance or amounts shall be deemed to effect payment in
whole or in part of this Revolving Loan Promissory Note unless the Agent shall
have actually charged such account or accounts for the purposes of such
reduction or payment of this Revolving Loan Promissory Note.

Upon the occurrence and during the continuance of any one or more of the Events
of Default specified in the Agreement or upon termination of this Agreement, all
amounts then remaining unpaid on this Revolving Loan Promissory Note may become,
or be declared to be, immediately due and payable as provided in the Agreement.

Each Company and the Guarantors, sureties and endorses jointly and severally
waive grace, demand, presentment for payment, notice of dishonor or default,
notice of intent to accelerate, notice of acceleration, protest and diligence in
collecting this Revolving Loan Promissory Note.

This Revolving Loan Promissory Note shall be governed by, and construed in
accordance with, the laws of the State of New York and the applicable federal
laws of the United States.

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT
<PAGE>   14

This Revolving Loan Promissory Note is given in amendment, replacement and
substitution, but not extinguishment, of all amounts unpaid under that certain
Revolving Loan Promissory Note dated November 22, 1999 payable by the Companies
to the order of CTIBC as Agent for the Lenders in the stated principal amount of
$65,000,000.00.

                         COMPANIES:

                         UTI DRILLING, L.P.

                         By: UTICO HARD ROCK BORING, INC.,
                             As Sole General Partner

                             By:
                                 -----------------------------------------------
                                 John E. Vollmer III, Vice President

                         SUITS DRILLING COMPANY

                         By:
                             ---------------------------------------------------
                             John E. Vollmer III, Vice President

                         UNIVERSAL WELL SERVICES, INC.

                         By:
                             ---------------------------------------------------
                             John E. Vollmer III, Vice President

                         UTI MANAGEMENT SERVICES, L.P.

                             By: UTICO HARD ROCK BORING,
                                 As Sole General Partner

                                 By:
                                     -------------------------------------------
                                     John E. Vollmer III, Vice President

                         NORTON DRILLING, L.P., as successor in
                         interest (by conversion) to Norton Drilling Company

                         By: Norton GP, L.L.C., as sole General Partner

                             By: Norton Drilling Services, Inc., its sole member

                                 By:
                                     -------------------------------------------
                                 Name:
                                       -----------------------------------------
                                 Title:
                                        ----------------------------------------

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT
<PAGE>   15

                                SCHEDULE TO GRID

<Table>
<Caption>
             Date                           Loan                        Payment                       Balance
<S>                              <C>                           <C>                          <C>

------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------

</Table>

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT

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