Document:

exh10_1.htm

    
EXHIBIT
      10.1

    
 

    EXPENSE
      REIMBURSEMENT AND PARTIAL FEE WAIVER AGREEMENT

     

    THIS
      EXPENSE REIMBURSEMENT AND PARTIAL FEE WAIVER AGREEMENT (the “Agreement”), dated
      as of November 30, 2007, is entered into by and between Tortoise Capital
      Resources Corporation (the “Company”), a Maryland corporation, and Tortoise
      Capital Advisors, LLC, a Delaware limited liability company (the
“Adviser”).

     

    WHEREAS,
      the Company is registered under the Investment Company Act of 1940, as amended
      (the “1940 Act”), as a closed-end management company.

     

    WHEREAS,
      the Company and the Adviser have entered into an Investment Advisory Agreement
      (“Advisory Agreement”), pursuant to which the Adviser provides investment
      management and advisory services to the Company for compensation based on the
      value of the average managed assets of the Company.  The defined terms
      used in this Agreement without definition are used herein as defined in the
      Advisory Agreement; and

     

    WHEREAS,
      the Company and the Adviser have determined that it is appropriate and in the
      best interests of the Company for the Adviser to reimburse the Company for
      certain amounts of expenses for a limited period of time.

     

    NOW
      THEREFORE, the parties hereto agree as follows:

     

    1.  EXPENSE
      REIMBURSEMENT.

     

    The
      Adviser shall reimburse the Company for certain expenses incurred by the Company
      beginning September 1, 2007 and ending December 31, 2008.  For such
      time period, the Adviser shall reimburse the Company quarterly for expenses
      incurred by the Company in an amount equal to an annual rate of 0.25% of the
      Company’s average monthly Managed Assets for such quarter.

     

    To
      effect
      the expense reimbursement contemplated by this Agreement, the Company shall
      offset the desired amount of any such reimbursement against the investment
      advisory fee payable for such quarter pursuant to the Advisory
      Agreement.

     

    2.  LIMITED
      CAPITAL GAINS FEE WAIVER.

     

    The
      Company anticipates investing in portfolio companies that make scheduled
      periodic distributions to its investors.  Those scheduled periodic
      distributions are made possible by the normally recurring cash flow from the
      operations of the portfolio company (“Expected Distributions”), but a portion of
      those Expected Distributions may be characterized by the Company as a return
      of
      capital for book purposes.  The Adviser hereby waives its right to
      receive the Capital Gains Incentive Fee to the extent, and only to the extent,
      such fee would be due as to that portion of any Expected Distribution that
      is
      characterized by the Company as a return of capital for book
      purposes.  This waiver shall not apply to any portion of any
      distribution from a portfolio company that is not an Expected
      Distribution.  This waiver shall remain in effect for so long as the
      Advisory Agreement remains in effect.

     

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    3.  MISCELLANEOUS.

     

    3.1  Captions.  The
      captions in this Agreement are included for convenience of reference only and
      in
      no other way define or delineate any of the provisions hereof or otherwise
      affect their construction or effect.

     

    3.2  Interpretation.  Nothing
      herein contained shall be deemed to require the Company to take any action
      contrary to the Company’s governing documents, or any applicable statutory or
      regulatory requirement to which it is subject or by which it is bound, or to
      relieve or deprive the Company’s Board of Directors of its responsibility for
      and control of the conduct of the affairs of the Company.

     

    3.3  Amendments.  This
      Agreement may be amended only by a written agreement signed by each of the
      parties hereto.

     

     

    [SIGNATURE
      PAGE FOLLOWS]

     

    
      
              

                        
    

         

      

      
         

        
          

        

      

      
         

      

    

    IN
      WITNESS WHEREOF, the parties have caused this Agreement to be signed by their
      respective officers thereunto duly authorized as of the day and year first
      above
      written.

     

    
      	 	
              TORTOISE
                CAPITAL RESOURCES CORPORATION

               

               

              By: _________________________________________                                                               

              Name:  Edward
                Russell

              Title:    President

            
	 	
               

               

               

              TORTOISE
                CAPITAL ADVISORS, LLC

               

               

              By: _________________________________________                                                               

              Name:  Terry
                Matlack

              Title:    Managing
                DirectorFiled by Bowne Pure Compliance

 

Exhibit 10.2

PROMISSORY NOTE

			
	 	 	 
	$75,000.00
	 	October 20th, 2007

FOR VALUE RECEIVED, the undersigned Newsearch, Inc., a Colorado corporation (“Maker”) promises
to pay to the order of Profit Consultants Inc (“Lender”), at its principal office, or at such other
place as may be designated in writing by the holders of this Promissory Note (“Note”), the
principal sum of SEVENTY FIVE THOUSAND 00/100 DOLLARS ($75,000.00) (the “Principal Sum”). The
unpaid Principal Sum shall bear interest at 7.5% per annum and shall be due in twelve (12) months.

All payments to be made under this Note shall be payable in lawful money of the United States
of America which shall be legal tender for public and private debts at the time of payment.

In the event that an action is instituted to collect this Note, or any portion thereof, Maker
promises to pay all costs of collection, including but not limited to reasonable attorneys’ fees,
court costs, and such other sums as the court may establish.

In the event of a default under this Note when due, then the holder of this Note, at its
election, may declare the entire unpaid Principal Sum due and payable.

Every provision hereof is intended to be several. If any provision of this Note is
determined, by a court of competent jurisdiction to be illegal, invalid or unenforceable, such
illegality, invalidity or unenforceability shall not affect the other provisions hereof, which
shall remain binding and enforceable.

This Note is made in the State of Colorado and it is mutually agreed that Colorado law shall
apply to the interpretation of the terms and conditions of this Note.

All agreements between the holder of this Note and Maker are hereby expressly limited so that
in no contingency or event whatsoever, whether by reason of deferment or acceleration of the
maturity of this Note or otherwise, shall the rate of interest hereunder exceed the maximum
permissible under applicable law with respect to the holder. If, from any circumstances
whatsoever, the rate of interest resulting from the payment and/or accrual of any amount of
interest hereunder, at any time that payment of interest is due and/or at any time that interest is
accrued, shall exceed the limits prescribed by such applicable law, then the payment and/or accrual
of such interest shall be reduced to that resulting from the maximum rate of interest permissible
under such applicable law. This provision shall never be superseded or waived.

The makers, endorsers, and/or guarantors of this Note do hereby severally waive presentment,
demand, protest and notices of protest, demand, dishonor and nonpayment.

 

 

 

IN WITNESS WHEREOF, this instrument is executed as of the date first hereinabove set forth.

	 	 	 	 	 
	 	NEWSEARCH, INC.

 	 
	 	By:  	/s/ Kenneth Adessky
 	 
	 	 	Kenneth Adessky, 	 
	 	 	C.F.OFiled by Bowne Pure Compliance

 

Exhibit 10.1

Execution

FIRST AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

THIS FIRST AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”) is
entered into as of December 3, 2007, among ALLIS-CHALMERS ENERGY INC., a Delaware corporation, as
borrower (the “Borrower”), the undersigned Guarantors (collectively, the “Guarantors”), ROYAL BANK
OF CANADA, as Administrative Agent and Collateral Agent for the Lenders parties to the hereinafter
defined Credit Agreement (in such capacities, the “Administrative Agent” and “Collateral Agent,”
respectively) and the undersigned Lenders.

Reference is made to the Second Amended and Restated Credit Agreement dated as of April 26,
2007 among Borrower, the Administrative Agent, the Collateral Agent and the Lenders parties thereto
(as amended, the “Credit Agreement”). Unless otherwise defined in this Amendment, capitalized
terms used herein shall have the meaning set forth in the Credit Agreement; all section, exhibit
and schedule references herein are to sections, exhibits and schedules in the Credit Agreement; and
all paragraph references herein are to paragraphs in this Amendment.

RECITALS

A. The Borrower has requested certain amendments to the Credit Agreement and the Lenders are
willing, on the terms and conditions set forth herein to amend the Credit Agreement as hereinafter
set forth.

Accordingly, for adequate and sufficient consideration, the parties hereto agree, as follows:

Paragraph 1. Amendments. Effective as of the First Amendment Effective Date, the
Credit Agreement is amended as follows:

1.1 Definitions. Section 1.01 of the Credit Agreement is amended as follows:

(a) Each of the following definitions is amended in its entirety to read as follows:

“Reinvested means used (or committed by the Borrower for use) for Capital Expenditures
or Acquisitions in connection with the oil field services business of the Borrower or any of
its Domestic Subsidiaries; provided however if any Net Cash Proceeds are received by DLS or
one of its Subsidiaries from Insurance Proceeds or Dispositions, DLS or its Subsidiary may
use such Net Cash Proceeds for Capital Expenditures in connection with its Argentina and
Bolivia oil field services business.”

“Triggering Sale means receipt of any Insurance Payment and any Disposition (including
sales of stock or other equity interests of Subsidiaries) (other than a Disposition
permitted by Section 7.07(a), (b) or (c)) by Borrower or any of its Subsidiaries (Domestic
or Foreign) to any other Person (other than to the Borrower or to a Wholly-Owned Domestic
Subsidiary of the Borrower) with respect to which the Net Cash Proceeds realized by Borrower
or any such Subsidiary for such Disposition and from any Insurance Payments, when aggregated
with the Net Cash Proceeds from all such other Dispositions by the Borrower or any such
Subsidiary occurring
since the Second Amended and Restated Closing Date and all Insurance Payments received
by the Borrower or any such Subsidiary since the Second Amended and Restated Closing Date,
equals or exceeds the Threshold Amount. The portion of the Net Cash Proceeds in excess of
the Threshold Amount is herein called the “Reduction Amount.”

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(b) The following paragraph is added to the end of the definition of Applicable Rate:

“In the event that any Compliance Certificate delivered hereunder is shown to be inaccurate
(regardless of whether this Agreement or the Aggregate Revolving Commitment is in effect
when such inaccuracy is discovered), and such inaccuracy, if corrected, would have led to
the application of a higher Applicable Rate based upon the foregoing pricing grid (the
“Accurate Applicable Rate”) for any period that such Compliance Certificate covered, then
(i) the Borrower shall immediately deliver to the Administrative Agent a Compliance
Certificate for such period, (ii) the Applicable Rate shall be adjusted such that after
giving effect to the corrected Compliance Certificate the Applicable Rate shall be reset to
the Accurate Applicable Rate based upon the foregoing pricing grid for such period as set
forth in the foregoing pricing grid and (iii) if the Accurate Applicable Rate is higher than
the Applicable Rate based upon the foregoing pricing grid, the Borrower shall immediately
pay to the Administrative Agent, for the account of the Lenders, the accrued additional
interest owing as a result of such Accurate Applicable Rate for such period.”

(c) The following definitions are inserted alphabetically into Section 1.01 of the Credit
Agreement:

“Agreement means this Second Amended and Restated Credit Agreement as amended by the
First Amendment to Second Amended and Restated Credit Agreement.”

“First Amendment Effective Date means the date the First Amendment to Second Amended
and Restated Credit Agreement by its terms becomes effective among the parties thereto.”

“First Amendment to Second Amended and Restated Credit Agreement means that certain
First Amendment to Second Amended and Restated Credit Agreement dated as of December 3,
2007, among the Borrower, the Guarantors, Royal Bank of Canada, as Administrative Agent and
Collateral Agent, and the Lenders.”

“Increase Effective Date has the meaning set forth in Section 2.14(d).”

“Local Argentina Financing Activities” means financing provided to DLS and its
Subsidiaries by local credit providers based in Argentina, non-Argentina based credit
providers and U.S. and Canadian governmental financing agencies such as the Export-Import
Bank of the U.S. and the Canadian Export Development Corporation.”

1.2 Section 2.14. A new Section 2.14 is hereby added to the Agreement to read in its
entirety as follows:

“2.14 Revolving Commitment Increase

(a) Request for Increase. Upon notice to the Administrative Agent, the Borrower may
request from time to time an increase in the Aggregate Revolving Commitment by an amount in
the aggregate not exceeding $35,000,000; provided that any such increased Aggregate
Revolving Commitment shall be secured pari passu with the Obligations. At the time of
sending such notice, the Borrower (in consultation with the Administrative Agent) shall
specify the time period within which each Lender that is invited to participate in the
increased Facility is requested to respond (which shall in no event be less than 15 Business
Days from the date of delivery of such notice). The Borrower may also invite additional
Eligible Assignees to become Lenders pursuant to a joinder agreement in form and substance
satisfactory to the Administrative Agent and its counsel. Each Lender and such additional
Eligible Assignees are subject to the approval of the Administrative Agent.

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(b) Elections to Increase. Each Lender and additional Eligible Assignee
invited to participate shall notify the Administrative Agent within such time period whether
or not it agrees to participate in the increase in the Aggregate Revolving Commitment (such
election to be at the sole discretion of each Lender and additional Eligible Assignee) and,
if so, by what amount. Any Lender or additional Eligible Assignee not responding within
such time period shall be deemed to have declined to participate in the increase in the
Aggregate Revolving Commitment.

(c) Notification by Administrative Agent. The Administrative Agent shall
notify the Borrower, each Lender and each additional Eligible Assignee of the responses to
the request made hereunder to increase the Aggregate Revolving Commitment.

(d) Effective Date and Allocations. If the Aggregate Revolving Commitment is
increased in accordance with this Section, the Administrative Agent and the Borrower shall
determine the effective date (the “Increase Effective Date”) and the final allocation of
such increase. The Administrative Agent shall promptly notify the Borrower, Lenders and
additional Eligible Assignees of the final allocation of such increase and the Increase
Effective Date.

(e) Conditions to Effectiveness of Increase. As conditions precedent to such
increase, the terms and documentation in respect thereof shall be satisfactory to the
Administrative Agent and the Borrower shall deliver to the Administrative Agent a
certificate of each Loan Party dated as of the Increase Effective Date signed by a
Responsible Officer of such Loan Party (i) certifying and attaching the resolutions adopted
by such Loan Party approving or consenting to such increase, and (ii) in the case of the
Borrower, certifying that, before and after giving effect to such increase, (A) no Default
or Event of Default exists or would exist immediately after giving effect to the increase in
the Aggregate Revolving Commitment, (B) the representations and warranties contained in
Article V and the other Loan Documents are true and correct in all material respects on and
as of the Increase Effective Date, except to the extent that such representations and
warranties specifically refer to an earlier date, in which case they are true and correct in
all material respects as of such earlier date, and except that for purposes of this Section
2.14, the representations and warranties contained in subsection (a) of Section 5.05 shall
be deemed to refer to the most recent financial statements furnished pursuant to clauses (a)
and (b), respectively, of Section 6.01, and (C) all financial covenants in Section 7.19
would be satisfied on a pro forma basis as of the most recent testing date after giving
effect to actual Credit Extensions on the Increase Effective Date.

(f) Conflicting Provisions. This Section shall supersede any provisions in
Sections 2.11 or 10.01 to the contrary.”

1.3 Section 6.12. Section 6.12 of the Credit Agreement is amended in its entirety to
read as follows:

“6.12 Use of Proceeds. Use proceeds of the Revolver Facility to (i) refinance the
Indebtedness outstanding under the First Amended and Restated Credit Agreement, (ii) finance
working capital requirements and other general corporate purposes of the Borrower and its
Domestic Subsidiaries, including Permitted Acquisitions, (iii) issue Letters of Credit, and
(iv) pay transaction fees and expenses associated with this Agreement; provided, however,
that at no time may more than $25,000,000 of proceeds of the Revolver Facility (or Letters
of Credit) be advanced or invested, directly or indirectly, in or to DLS or any of its
Subsidiaries.”

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1.4 Section 7.01. Section 7.01(m) of the Credit Agreement is amended in its entirety
to read as follows:

“(m) Liens securing Indebtedness of DLS to Borrower of up to $17,900,000 to refinance
Indebtedness originally owing by DLS to a third party permitted under Section 7.04(h);

1.5 Section 7.01. Section 7.01(o) of the Credit Agreement is amended in its entirety
to read as follows:

“(o) Liens securing Indebtedness of up to $5,500,000 owing by DLS’ Argentina Branch to
US Bank National Association permitted under Section 7.04(b); and”

1.6 Section 7.01. Section 7.01(p) of the Credit Agreement is amended in its entirety
to read as follows:

“(p) Liens on assets of DLS and DLS’ Subsidiaries securing Indebtedness owing by DLS
and/or DLS’ Subsidiaries in connection with Local Argentina Financing Activities permitted
under Section 7.04(j).”

1.7 Section 7.02. Section 7.02(i) of the Credit Agreement is amended in its entirety
to read as follows:

“(i) Investments consisting of Borrower’s lending up to $17,900,000 to DLS to refinance
Indebtedness originally owing by DLS to a third party;”

1.8 Section 7.02. Section 7.02(k) of the Credit Agreement is amended in its entirety
to read as follows:

“(k) Investments consisting of Borrower’s and Guarantors’ being liable as guarantors
for up to $5,500,000 in connection with a letter of credit issued by US Bank National
Association for DLS’ Argentina Branch; and”

1.9 Section 7.02. Section 7.02(l) of the Credit Agreement is amended in its entirety
to read as follows:

“(l) Investments by Borrower in DLS and DLS’ Subsidiaries consisting of (i)
Indebtedness permitted by Sections 7.04(h), (i) and (j) and (ii) during the Borrower’s 2007
and 2008 Fiscal Years, subject to the limitation set forth in Section 7.14, a combined total
for both fiscal years of up to $50,000,000 to fund Capital Expenditures of DLS and DLS’
Subsidiaries; provided no more than $25,000,000 of such Capital Expenditures may be funded
by Borrowing under this Agreement.”

1.10 Section 7.04. Section 7.04(c) of the Credit Agreement is amended in its entirety
to read as follows:

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“(c) Guaranty Obligations of the Borrower and/or any of its Subsidiaries in respect of
Indebtedness otherwise permitted hereunder of the Borrower; provided, however, with respect
to Indebtedness owing by DLS and/or DLS’ Subsidiaries in connection with Local Argentina
Financing Activities described in Section 7.04(j), the amount of the Guaranty Obligation of
Borrower and/or any of its Subsidiaries in respect thereof shall not exceed the greater of
(i) 15% of DLS’ consolidated tangible assets and (b) $30,000,000;”

1.11 Section 7.04. Section 7.04(h) of the Credit Agreement is amended in its entirety
to read as follows:

“(h) Indebtedness of DLS to Borrower of up to $17,900,000 to refinance Indebtedness
originally owing by DLS to a third party;”

1.12 Section 7.04. Section 7.04(j) of the Credit Agreement is amended in its entirety
to read as follows:

“(j) Indebtedness of DLS and/or DLS’ Subsidiaries owing in connection with Local
Argentina Financing Activities incurred to fund local operations in Argentina or Bolivia not
to exceed the greater of (i) 15% of DLS’ consolidated tangible assets and (ii) $30,000,000;
provided, if any such Indebtedness is guaranteed by Borrower or any of its Subsidiaries
(other than DLS and DLS’ Subsidiaries), the amount of such Guaranty Obligations does not
exceed the permissible amount set forth in Section 7.04(c); and provided further such
Indebtedness may not be secured by any assets of Borrower or any of its Subsidiaries (other
than DLS and DLS’ Subsidiaries) but such Indebtedness may be secured by Liens on assets of
DLS and DLS’ Subsidiaries;”

1.13 Section 7.14. Section 7.14 of the Credit Agreement is amended in its entirety to
read as follows:

“7.14 Capital Expenditures. Make or incur capital expenditures in excess of
$120,000,000 for the 2007 Fiscal Year, $140,000,000 for the 2008 Fiscal Year (including any
Investments described in Section 7.02(l)(ii)) and for the 2009 Fiscal Year and each Fiscal
Year thereafter, on a rolling four-quarter basis, an amount in excess of 20% of the
Borrower’s Consolidated Net Worth as of the last day of the most recent quarter end for
which financial statements have been delivered pursuant to Sections 6.01(a) or (b);
provided, however, there shall be excluded from capital expenditures “lost in hole”
replacement capital expenditures invoiced to customers of Borrower or its Subsidiaries by
Borrower or its Subsidiaries in the ordinary course of business unless any such invoice
remains unpaid for more than 90 days after its due date, in which case such invoiced amount
shall be included in capital expenditures.”

1.14 Section 10.01(a)(v). Section 10.01(a)(v) of the Credit Agreement is amended in
its entirety to read as follows:

(v) change the Pro Rata Share of any Lender (except as otherwise results from an
increase in the Aggregate Revolving Commitment pursuant to Section 2.14 which increase is
subject to the provisions of Section 2.14 but is not otherwise subject to the consent of the
Required Lenders or any Lender);

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1.15 Schedule 2.01. Schedule 2.01 (Revolving Commitments) to the Credit
Agreement is hereby amended in its entirety by Supplemental Schedule 2.01 attached as Supplemental
Schedule 2.01 to this Amendment. Any references in the Credit Agreement to Schedule 2.01 shall be
deemed to refer to Supplemental Schedule 2.01 from and after the First Amendment Effective Date.

1.16 Exhibit A-1 Form of Borrowing Notice. Exhibit A-1 (Form of Borrowing Notice) to
the Credit Agreement is hereby amended in its entirety by Supplemental Exhibit A-1 attached as
Supplemental Exhibit A-1 to this Amendment. Any references in the Credit Agreement to Exhibit A-1
shall be deemed to refer to Supplemental Exhibit A-1 from and after the First Amendment Effective
Date.

1.17 Exhibit C-Compliance Certificate. Exhibit C (Form of Compliance Certificate) to
the Credit Agreement is hereby amended in its entirety by Supplemental Exhibit C attached as
Supplemental Exhibit C to this Amendment. Any references in the Credit Agreement to Exhibit C
shall be deemed to refer to Supplemental Exhibit C from and after the First Amendment Effective
Date.

1.18 Exhibit D-Assignment and Assumption. Exhibit D (Form of Assignment and
Assumption) to the Credit Agreement is hereby amended in its entirety by Supplemental Exhibit D
attached as Supplemental Exhibit D to this Amendment. Any references in the Credit Agreement to
Exhibit D shall be deemed to refer to Supplemental Exhibit D from and after the First Amendment
Effective Date.

Paragraph 2. Effective Date. This Amendment shall not become effective until the
date (such date, the “First Amendment Effective Date”) the Administrative Agent receives all of the
agreements, documents, certificates, instruments, and other items described below:

(a) this Amendment, executed by the Borrower, the Guarantors, and each other Lender;

(b) new replacement Revolver Notes executed by the Borrower, payable to each Lender in the
amount of each such Lender’s increased Revolver Facility Committed Sum;

(c) from the Borrower and the existing Guarantors, such certificates of secretary,
assistant secretary, manager, or general partner, as applicable, as the Administrative Agent may
require, certifying (i) resolutions of its board of directors, managers or members (or their
equivalent) authorizing the execution and performance of this Amendment and the other Loan
Documents which such Person is executing in connection herewith, (ii) the incumbency and signature
of the officer executing such documents, and (iii) no change in such Person’s organizational
documents since April 26, 2007;

(d) fees and expenses required to be paid pursuant to Paragraph 5 of this Amendment, to
the extent invoiced prior to the First Amendment Effective Date;

(e) receipt by the Lenders of updated capital expenditure budgets for the Borrower and its
Subsidiaries for their 2007 and 2008 Fiscal Years; and

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(f) such other assurances, certificates, documents and consents as the Administrative Agent
may require.

Paragraph 3. Acknowledgment and Ratification. As a material inducement to the
Administrative Agent and the Lenders to execute and deliver this Amendment, each of the Borrower
and the Guarantors (i) consents to the agreements in this Amendment, (ii) agrees and acknowledges
that the execution, delivery, and performance of this Amendment shall in no way release, diminish,
impair, reduce, or otherwise affect the respective obligations of the Borrower or any Guarantor
under the Loan Documents to which it is a party, which Loan Documents shall remain in full force
and effect, and all rights thereunder are hereby ratified and confirmed.

Paragraph 4. Representations. As a material inducement to the Administrative Agent and
the Lenders to execute and deliver this Amendment, each of the Borrower and the Guarantors
represents and warrants to the Administrative Agent and the Lenders that as of the First Amendment
Effective Date and as of the date of execution of this Amendment, (a) all representations and
warranties in the Loan Documents are true and correct in all material respects as though made on
the date hereof, except to the extent that any of them speak to a different specific date, and (b)
no Default or Event of Default exists.

Paragraph 5. Expenses, Funding Losses. The Borrower shall pay on demand all
reasonable costs, fees, and expenses paid or incurred by the Administrative Agent incident to this
Amendment, including, without limitation, Attorney Costs in connection with the negotiation,
preparation, delivery, and execution of this Amendment and any related documents, filing and
recording costs, and the costs of title insurance endorsements, if any.

Paragraph 6. Miscellaneous.

(a) This Amendment is a “Loan Document” referred to in the Credit Agreement. The provisions
relating to Loan Documents in Article X of the Credit Agreement are incorporated in this Amendment
by reference. Unless stated otherwise (a) the singular number includes the plural and vice versa
and words of any gender include each other gender, in each case, as appropriate, (b) headings and
captions may not be construed in interpreting provisions, (c) this Amendment must be construed, and
its performance enforced, under Texas law and applicable federal law, (d) if any part of this
Amendment is for any reason found to be unenforceable, all other portions of it nevertheless remain
enforceable, and (e) this Amendment may be executed in any number of counterparts with the same
effect as if all signatories had signed the same document, and all of those counterparts must be
construed together to constitute the same document.

Paragraph 7. Entire Agreement. This amendment represents the final agreement
between the parties about the subject matter of this amendment and 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.

Paragraph 8. Parties. This Amendment binds and inures to the benefit of the Borrower,
the Guarantors, the Administrative Agent, the Collateral Agent, the other Lenders, and their
respective successors and assigns.

Paragraph 9. Further Assurances. The parties hereto each agree to execute from time to
time such further documents as may be necessary to implement the terms of this Amendment.

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The parties hereto have executed this Amendment in multiple counterparts to be effective as of
the First Amendment Effective Date.

Remainder of Page Intentionally Blank

Signature Pages to Follow.

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IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed as of the
date first above written.

	 	 	 	 	 
	 	 	BORROWER:
	 
	 	 	 	 
	 	 	ALLIS-CHALMERS ENERGY INC.,

a Delaware corporation, as Borrower
	 
	 	 	 	 
	 

	 	By:	 	/s/ Victor M. Perez
	 

	 	 	 	 
	 

	 	 	 	Victor M. Perez
	 

	 	 	 	Chief Financial Officer

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GUARANTORS:

	 	 	 	 	 	 	 
	AirComp L.L.C.	 	Allis-Chalmers GP, LLC
	 
	 	 	 	 	 	 
	By:

	 	/s/ Victor M. Perez
	 	By:	 	/s/ Victor M. Perez

	 

	 	 
	 	 	 	 
	 

	 	Victor M. Perez
	 	 	 	Victor M. Perez
	 

	 	Chief Financial Officer
	 	 	 	Chief Financial Officer
	 
	 	 	 	 	 	 
	Allis-Chalmers LP, LLC	 	Allis-Chalmers Management, LP
	 
	 	 	 	 	 	 
	By:

	 	/s/ Jeffrey R. Freedman
	 	By:
	 	Allis-Chalmers GP, LLC
	 

	 	 	 	 	 	 
	 

	 	Jeffrey R. Freedman
	 	 	 	its general partner
	 

	 	Vice President and Secretary	 	 	 	 
	 

	 	 	 	By:	 	/s/ Victor M. Perez

	 

	 	 	 	 	 	 
	 

	 	 	 	 	 	Victor M. Perez
	 

	 	 	 	 	 	Chief Financial Officer
	 
	 	 	 	 	 	 
	Allis-Chalmers Production Services, Inc.	 	Allis-Chalmers Rental Services, Inc.
	 
	 	 	 	 	 	 
	By:

	 	/s/ Victor M. Perez
	 	By:	 	/s/ Victor M. Perez

	 

	 	 
	 	 	 	 
	 

	 	Victor M. Perez
	 	 	 	Victor M. Perez
	 

	 	Chief Financial Officer
	 	 	 	Chief Financial Officer
	 
	 	 	 	 	 	 
	Allis-Chalmers Tubular Services, Inc.	 	Mountain Compressed Air, Inc.
	 
	 	 	 	 	 	 
	By:

	 	/s/ Victor M. Perez
	 	By:	 	/s/ Munawar H. Hidayatallah
	 

	 	 
	 	 	 	 
	 

	 	Victor M. Perez
	 	 	 	Munawar H. Hidayatallah
	 

	 	Chief Financial Officer
	 	 	 	Chairman and Chief Executive Officer
	 
	 	 	 	 	 	 
	OilQuip Rentals Inc.	 	Strata Directional Technology, Inc.
	 
	 	 	 	 	 	 
	By:

	 	/s/ Munawar H. Hidayatallah	 	By:	 	/s/ Victor M. Perez

	 

	 	 
	 	 	 	 
	 

	 	Munawar H. Hidayatallah
	 	 	 	Victor M. Perez
	 

	 	Chairman and Chief Executive Officer
	 	 	 	Chief Financial Officer
	 
	 	 	 	 	 	 
	Petro-Rentals Incorporated	 	 	 	 
	 
	 	 	 	 	 	 
	By:
	 	/s/ Theodore F. Pound, III	 	 	 	 
	 

	 	 	 	 	 	 
	 

	 	Theodore F. Pound, III	 	 	 	 
	 

	 	Vice President and Secretary	 	 	 	 

First Amendment to Allis-Chalmers

Energy Second Amended and

Restated Credit Agreement

 

Signature Page 2

 

	 	 	 	 	 
	 
 	 	ADMINISTRATIVE AGENT:

	 	 	ROYAL BANK OF CANADA,

as Administrative Agent and Collateral Agent
	 
	 	 	 	 
	 

	 	By:	 	/s/ Ann Hurley 
	 

	 	 	 	 
	 

	 	Name:	 	Ann Hurley 
	 

	 	Title:	 	Manager, Agency 
	 
	 	 	 	 
	 	 	L/C ISSUER AND LENDER:
	 
	 	 	 	 
	 	 	ROYAL BANK OF CANADA, as a Lender

and L/C Issuer
	 
	 	 	 	 
	 

	 	By:	 	/s/ Jason S. York 
	 

	 	 	 	 
	 

	 	Name:	 	Jason S. York 
	 

	 	Title:	 	Authorized Signatory 

First Amendment to Allis-Chalmers

Energy Second Amended and

Restated Credit Agreement

 

Signature Page 3

 

	 	 	 	 	 
	 	 	LENDER:
	 
	 	 	 	 
	 	 	CATERPILLAR FINANCIAL

SERVICES CORPORATION, as Lender
	 
	 	 	 	 
	 

	 	By:	 	/s/ Christopher C. Patterson
	 

	 	 	 	 
	 

	 	Name:	 	Christopher C. Patterson
	 

	 	Title:	 	Global Operations Manager-Capital Markets

First Amendment to Allis-Chalmers

Energy Second Amended and

Restated Credit Agreement

 

Signature Page 4

 

	 	 	 	 	 
	 	 	LENDER:
	 
	 	 	 	 
	 	 	JPMORGAN CHASE BANK, N.A.

as a Lender
	 
	 	 	 	 
	 

	 	By:	 	/s/ Thomas Okamoto
	 

	 	 	 	 
	 

	 	Name:	 	Thomas Okamoto
	 

	 	Title:	 	Vice President

First Amendment to Allis-Chalmers

Energy Second Amended and

Restated Credit Agreement

 

Signature Page 5

 

	 	 	 	 	 
	 	 	LENDER:
	 
	 	 	 	 
	 	 	WACHOVIA BANK, NATIONAL ASSOCIATION

as a Lender

	 

	 	By:	 	/s/ Kenneth C. Coulter
	 

	 	 	 	 
	 

	 	Name:	 	Kenneth C. Coulter
	 

	 	Title:	 	Vice President

First Amendment to Allis-Chalmers

Energy Second Amended and

Restated Credit Agreement

 

Signature Page 6

 

	 	 	 	 	 
	 	 	LENDER:
	 	 	WELLS FARGO BANK, N.A.
	 	 	as a Lender
	 
	 	 	 	 
	 

	 	By:	 	/s/ Donald W. Herrick, Jr.
	 

	 	 	 	 
	 

	 	Name:	 	Donald W. Herrick, Jr.
	 

	 	Title:	 	Vice President

First Amendment to Allis-Chalmers

Energy Second Amended and

Restated Credit Agreement

 

Signature Page 7

 

	 	 	 	 	 
	 	 	LENDER:
	 	 	NATIXIS,
	 	 	as a Lender
	 
	 	 	 	 
	 

	 	By:	 	/s/ Timothy L. Polvado
	 

	 	 	 	 
	 

	 	Name:	 	Timothy L. Polvado
	 

	 	Title:	 	Managing Director
	 	 	 	 	 
	 

	 	By:	 	/s/ Louis P. Laville, III
	 

	 	 	 	 
	 

	 	Name:	 	Louis P. Laville, III
	 

	 	Title:	 	Managing Director

First Amendment to Allis-Chalmers

Energy Second Amended and

Restated Credit Agreement

 

Signature Page 8

 

SUPPLEMENTAL SCHEDULE 2.01

REVOLVING COMMITMENTS

	 	 	 	 	 
	Lender	 	Revolving Commitment
	Royal Bank of Canada
	 	$	17,500,000.00	 
	Caterpillar Financial Services Corporation
	 	$	14,500,000.00	 
	JPMorgan Chase Bank, N.A.
	 	$	14,500,000.00	 
	Wachovia Bank, National Association
	 	$	14,500,000.00	 
	Wells Fargo Bank, N.A.
	 	$	14,500,000.00	 
	Natixis
	 	$	14,500,000.00	 
	Total:
	 	$	90,000,000.00	 

Supplemental Schedule 2.01

First Amendment to Allis-Chalmers

Energy Credit Agreement

 

 

 

SUPPLEMENTAL EXHIBIT A-1

FORM OF BORROWING NOTICE

Date: ____________, _____

Royal Bank of Canada,

as Administrative Agent

Agency Services Group

Royal Bank Plaza, 200 Bay Street

12th Floor, South Tower

Toronto ON M5J 2W7

Facsimile: (416) 842-4023

Ladies and Gentlemen:

Reference is made to that certain Second Amended and Restated Credit Agreement, dated as of
April 26, 2007 (as amended, restated, extended, supplemented or otherwise modified in writing from
time to time, the “Agreement;” the terms defined therein being used herein as therein defined),
among Allis-Chalmers Energy Inc., a Delaware corporation (the “Borrower”), Royal Bank of Canada, as
Administrative Agent, and the Lenders from time to time party thereto.

The undersigned hereby requests a revolving loan:

	I.	 	REVOLVER FACILITY

	 	1.	 	Status Information for the Revolver Facility

	 	(a)	 	Amount of Revolver Facility: $90,000,000

	 
	 	(b)	 	Revolving Loans outstanding prior to the
Borrowing requested herein: $
 _____ 

	 
	 	(c)	 	Letters of Credit outstanding prior to the
Borrowing requested herein: $
 _____ 

	 
	 	(d)	 	Principal amount of Revolving Loans available
to be borrowed (1(a) minus the sum of 1(b) and 1(c)): $
 _____ 

	 	2.	 	Amount of Borrowing: $
 _____ 

	 
	 	3.	 	Requested date of Borrowing:
 _____ 
, 200_; must be
prior to Maturity Date.

	 
	 	4.	 	Requested interest rate Type of Revolving Loan and applicable Dollar amount:

	 	(a)	 	Base Rate Revolving Loan for $
 _____ 

	 
	 	(b)	 	Eurodollar Rate Revolving Loan with Interest
Period of:

First Amendment to Allis-Chalmers

Energy Credit Agreement

 

Supplemental Exhibit A-1 Page 1

 

	 	 	 	 	 
	(i)

	 	one month for
	 	$                    
	(ii)

	 	two months for
	 	$                    
	(iii)

	 	three months for
	 	$                    
	(iv)

	 	six months for
	 	$                    

The undersigned hereby certifies that the following statements will be true on the date of the
proposed Borrowing(s) after giving effect thereto and to the application of the proceeds therefrom:

(a) the representations and warranties of the Borrower contained in Article V of the Agreement
are true and correct as though made on and as of such date (except such representations and
warranties which expressly refer to an earlier date, which are true and correct as of such earlier
date);

(b) with respect to a Borrowing of Revolving Loans, if any, the amount of the requested
Borrowing, when added to Revolving Loans outstanding prior to the Borrowing and Letters of Credit
outstanding prior to the Borrowing will not exceed the Aggregate Revolving Commitment;

(c) with respect to a Borrowing of Revolving Loans, if any, the amount of the requested
Borrowing, when added to Revolving Loans outstanding prior to the Borrowing and Letters of Credit
outstanding prior to the Borrowing the proceeds of which have been advanced, directly or
indirectly, to DLS or DLS’ Subsidiaries (whether as Investments, loans, capital contributions or
otherwise) does not exceed the $25,000,000 at any time limit set forth in Section 6.12 of the
Agreement;

(d) no Default or Event of Default has occurred and is continuing, or would result from such
proposed Borrowing(s).

The Borrowing requested herein complies with Sections 2.01, 2.02, 4.01, 4.02 and 4.04 of the
Agreement, as applicable.

	 	 	 	 	 
	 	 	ALLIS-CHALMERS ENERGY INC.,

a Delaware corporation, as Borrower
	 
	 	 	 	 
	 

	 	By:	 	 
	 

	 	 	 	 
	 

	 	Name:	 	 
	 

	 	 	 	 
	 

	 	Title:	 	 
	 

	 	 	 	 

First Amendment to Allis-Chalmers

Energy Credit Agreement

 

Supplemental Exhibit A-1 Page 2

 

SUPPLEMENTAL EXHIBIT C

FORM OF COMPLIANCE CERTIFICATE

(Pursuant to Section 6.02 of the Agreement)

Financial Statement Date: ___________, 200_

Royal Bank of Canada,

as Administrative Agent

Agency Services Group

Royal Bank Plaza, 200 Bay Street

12th Floor, South Tower

Toronto ON M5J 2W7

Facsimile: (416) 842-4023

Ladies and Gentlemen:

Reference is made to that certain Second Amended and Restated Credit Agreement, dated as of
April 26, 2007 (as amended, restated, extended, supplemented or otherwise modified in writing from
time to time, the “Agreement;” the terms defined therein being used herein as therein defined),
among Allis-Chalmers Energy Inc., a Delaware corporation (the “Borrower”), the Lenders from time to
time party thereto, and Royal Bank of Canada, as Administrative Agent. Capitalized terms used
herein but not defined herein shall have the meaning set forth in the Agreement.

The undersigned Responsible Officer hereby certifies as of the date hereof that he/she is the

 ____________________ 
of the Borrower, and that, as such, he/she is authorized to execute and
deliver this Certificate to the Administrative Agent on the behalf of the Borrower, and that:

[Use the following for Fiscal Year-end financial statements]

Attached hereto as Schedule 1 are the year-end audited consolidated financial statements of
the Borrower and its Subsidiaries required by Section 6.01(a) of the Agreement for the Fiscal Year
of the Borrower ended as of the above date, together with the report and opinion of an independent
certified public accountant required by such section; and

[Use the following for fiscal quarter-end financial statements]

Attached hereto as Schedule 1 are the unaudited consolidated financial statements of the
Borrower and its Subsidiaries required by Section 6.01(b) of the Agreement for the first three
fiscal quarters of the Borrower ended as of the above date, together with a certificate of a
Responsible Officer of the Borrower stating that such financial statements fairly present the
financial condition, results of operations and cash flows of the Borrower and its Subsidiaries for
such fiscal quarter in accordance with GAAP as at such date and for such period, subject only to
normal year-end audit adjustments and the absence of footnotes.

[Use the following for both Fiscal Year-end and quarter-end financial statements]

1. The undersigned has reviewed and is familiar with the terms of the Agreement and has made,
or has caused to be made under his/her supervision, a detailed review of the transactions and
condition (financial or otherwise) of the Borrower during the accounting period covered by the
attached financial statements.

First Amendment to Allis-Chalmers

Energy Credit Agreement

 

Supplemental Exhibit C Page 1

 

2. A review of the activities of the Borrower during such fiscal period has been made under
the supervision of the undersigned with a view to determining whether during such fiscal period the
Borrower performed and observed all its Obligations under the Loan Documents, and no Default or
Event of Default has occurred and is continuing except as follows (list of each such Default or
Event of Default and include the information required by Section 6.03 of the Agreement):

3. During such fiscal period no casualty losses have occurred, except as described below:

4. The covenant analyses and information set forth on Schedule 3 attached hereto are true and
accurate on and as of the date of this Certificate.

IN WITNESS WHEREOF, the undersigned has executed this Certificate as of
 _____ 
, 200  .

	 	 	 	 	 
	 	 	ALLIS-CHALMERS ENERGY INC.
a Delaware corporation, as Borrower

	 

	 	By:	 	 
	 

	 	 	 	 
	 

	 	Name:	 	 
	 

	 	 	 	 
	 

	 	Title:	 	 
	 

	 	 	 	 

First Amendment to Allis-Chalmers

Energy Credit Agreement

 

Supplemental Exhibit C Page 2

 

For the Quarter/Year ended ____________________(“Statement Date”)

SCHEDULE 3

to the Compliance Certificate

($ in 000’s)

	 	 	 	 	 	 	 
	I.	 	Section 7.04 — Indebtedness	 	 
	 
	 	 	 	 	 	 
	 

	 	A.
	 	Indebtedness outstanding on Second Amended and Restated
Closing Date and listed on Schedule 5.05 and any
refinancings, etc. permitted by Section 7.04(b)
	 	$                    
	 
	 	 	 	 	 	 
	 

	 	B.
	 	Indebtedness in connection with Swap Contracts permitted
by Section 7.04(d)
	 	$                    
	 
	 	 	 	 	 	 
	 

	 	C.
	 	Outstanding Principal Amount of Purchase Money
Indebtedness for fixed or capital assets permitted by Section
7.04(e) (may not exceed $2,000,000)
	 	$                    
	 
	 	 	 	 	 	 
	 

	 	D.
	 	Outstanding Principal Amount of Indebtedness associated
with Liens on acquired assets permitted by Section 7.04(f)
(may not exceed $2,000,000)
	 	$                    
	 
	 	 	 	 	 	 
	 

	 	E.
	 	Outstanding Principal Amount of Indebtedness associated
with Capital Leases and obligations to make equipment
financing lease or rental payments permitted by Section
7.04(g) (may not exceed $15,000,000)
	 	$                    
	 
	 	 	 	 	 	 
	 

	 	F.
	 	Indebtedness owing by DLS’ Argentina Branch to US Bank
National Association reflected on Schedule 5.05 (may not
exceed $5,500,000)	 	 
	 
	 	 	 	 	 	 
	 

	 	G.
	 	Indebtedness owing by DLS’ or DLS’ Subsidiaries owing in
connection with Local Argentina Financing Activities
permitted by Section 7.04(j) (may not exceed the greater of
(i) 15% of DLS’ consolidated tangible assets and (ii)
$30,000,000)	 	 
	 
	 	 	 	 	 	 
	II.	 	Section 7.19(a) — Interest Coverage Ratio	 	 
	 
	 	 	 	 	 	 
	 

	 	A.
	 	Consolidated EBITDA (subject to proforma adjustments, if
any, permitted by Section 7.19(e) of the Agreement) for four
consecutive fiscal quarters ending on the Financial Statement
Date (“Subject Period")(see Credit Agreement definition of
“Consolidated EBITDA”):
	 	$                    

First Amendment to Allis-Chalmers

Energy Credit Agreement

 

Supplemental Exhibit C Page 3

 

	 	 	 	 	 	 	 
	 

	 	B.
	 	Sum of (i) Consolidated Interest Charges (subject to
proforma adjustments, if any, permitted by Section 7.19(e) of
the Agreement) during Subject Period plus (ii) imputed
interest charges on Synthetic Leases during Subject Period:
	 	$                    
	 
	 	 	 	 	 	 
	 

	 	C.
	 	Is ratio of II.A. to II.B. at least 2.75 to 1.0?
	 	Yes/No
	 
	 	 	 	 	 	 
	III.	 	Section 7.19(b) — Fixed Asset Coverage Ratio	 	 
	 
	 	 	 	 	 	 
	 

	 	A.
	 	Orderly liquidation value of Borrower’s and its
Subsidiaries’ domestic fixed assets (determined as of most
recently delivered asset appraisal delivered pursuant to
Section 6.02(e) or (f) of the Credit Agreement) on which
Administrative Agent holds first priority perfected Lien:
	 	$                    
	 
	 	 	 	 	 	 
	 

	 	B.
	 	Outstanding Amount of Revolver Principal Debt on most
recent Financial Statement Date:
	 	$                    
	 
	 	 	 	 	 	 
	 

	 	C.
	 	Is ratio of III.A. to III.B. at least 1.33 to 1.0?
	 	Yes/No
	 
	 	 	 	 	 	 
	IV.	 	Section 7.19(c) — Leverage Ratio	 	 
	 
	 	 	 	 	 	 
	 

	 	A.
	 	Consolidated Funded Debt for Subject Period (see Credit
Agreement definition of “Consolidated Funded Debt"):
	 	$                    
	 
	 	 	 	 	 	 
	 

	 	B.
	 	Unrestricted cash of the Borrower and its Subsidiaries
deposited in an account with the Administrative Agent or
Collateral Agent (or another financial institution acceptable
to the Administrative Agent) plus (i) unrestricted cash of
the Borrower and its Subsidiaries deposited with a Person
other than a Lender subject to a control agreement in favor
of the Administrative Agent or Collateral Agent plus (ii) at
the Administrative Agent’s discretion, unrestricted cash of
the Borrower and its Subsidiaries reflected on the Borrower’s
consolidated balance sheet and otherwise subjected to a Lien
in favor of the Administrative Agent or Collateral Agent and
not otherwise pledged or subject to any claim or encumbrance
of any third party plus (iii) Cash Equivalents.	 	 
	 
	 	 	 	 	 	 
	 

	 	C.
	 	Line IV.A minus Line IV.B
	 	$                    
	 
	 	 	 	 	 	 
	 

	 	D.
	 	Consolidated EBITDA (subject to proforma adjustments, if
any, permitted by Section 7.19(e) of the Agreement) for
Subject Period:
	 	$                    
	 
	 	 	 	 	 	 
	 

	 	E.
	 	Is ratio of IV.C. to IV. D. no more than 4.00 to 1.0?
	 	Yes/No

First Amendment to Allis-Chalmers

Energy Credit Agreement

 

Supplemental Exhibit C Page 4

 

	 	 	 	 	 	 	 
	V.	 	Section 7.19(d) — Senior Leverage Ratio	 	 
	 
	 	 	 	 	 	 
	 

	 	A.
	 	Consolidated Senior Debt for Subject Period (see Credit
Agreement definition of “Consolidated Senior Debt"):
	 	$                    
	 
	 	 	 	 	 	 
	 

	 	B.
	 	Consolidated EBITDA (subject to proforma adjustments, if
any, permitted by Section 7.19(e) of the Agreement) for
Subject Period:
	 	$                    
	 
	 	 	 	 	 	 
	 

	 	C.
	 	Is ratio of V.A. to V. B. no more than 2.50 to 1.0?
	 	Yes/No

First Amendment to Allis-Chalmers

Energy Credit Agreement

 

Supplemental Exhibit C Page 5

 

SUPPLEMENTAL EXHIBIT D

FORM OF ASSIGNMENT AND ASSUMPTION

This Assignment and Assumption (the “Assignment and Assumption”) is dated as of the Effective
Date set forth below and is entered into by and between [Insert name of Assignor] (the “Assignor”)
and [Insert name of Assignee] (the “Assignee”). Capitalized terms used but not defined herein
shall have the meanings given to them in the Credit Agreement identified below (as may be amended,
the “Credit Agreement”), receipt of a copy of which is hereby acknowledged by the Assignee. The
Standard Terms and Conditions set forth in Annex I attached hereto are hereby agreed to and
incorporated herein by reference and made a part of this Assignment and Assumption as if set forth
herein in full.

For an agreed consideration, the Assignor hereby irrevocably sells and assigns to the
Assignee, and the Assignee hereby irrevocably purchases and assumes from the Assignor, subject to
and in accordance with the Standard Terms and Conditions and the Credit Agreement, as of the
Effective Date inserted by the Administrative Agent as contemplated below (i) all of the Assignor’s
rights and obligations in its capacity as a Lender under the Credit Agreement and any other
documents or instruments delivered pursuant thereto to the extent related to the amount and
percentage interest identified below of all of such outstanding rights and obligations of the
Assignor under the respective facilities identified below and (ii) to the extent permitted to be
assigned under applicable law, all claims, suits, causes of action and any other right of the
Assignor (in its capacity as a Lender) against any Person, whether known or unknown, arising under
or in connection with the Credit Agreement, any other documents or instruments delivered pursuant
thereto or the loan transactions governed thereby or in any way based on or related to any of the
foregoing, including, but not limited to, contract claims, tort claims, malpractice claims,
statutory claims and all other claims at law or in equity related to the rights and obligations
sold and assigned pursuant to clause (i) above (the rights and obligations sold and assigned
pursuant to clauses (i) and (ii) above being referred to herein collectively as, the “Assigned
Interest”). Such sale and assignment is without recourse to the Assignor and, except as expressly
provided in this Assignment and Assumption, without representation or warranty by the Assignor.

	 	 	 	 	 	 	 	 	 
	 

	 	 	1.	 	 	Assignor:	 	 
	 
	 	 	 	 	 	 	 	 
	 

	 	 	2.	 	 	Assignee:	 	 
	 

	 	 	 	 	 	 	 	[and is an Affiliate/Approved Fund of [identify Lender]
	 
	 	 	 	 	 	 	 	 
	 

	 	 	3.	 	 	Borrower(s):
	 	Allis-Chalmers Energy Inc.
	 
	 	 	 	 	 	 	 	 
	 

	 	 	4.	 	 	Administrative Agent:
	 	Royal Bank of Canada, as the administrative agent under
the Credit Agreement
	 
	 	 	 	 	 	 	 	 
	 

	 	 	5.	 	 	Credit Agreement:
	 	The $90,000,000 Second Amended and Restated Credit Agreement
dated as of April 26, 2007 among Allis-Chalmers Energy Inc., the Lenders parties
thereto, and Royal Bank of Canada, as Administrative Agent.

First Amendment to Allis-Chalmers

Energy Credit Agreement

 

Supplemental Exhibit D Page 1

 

	 	6.	 	Assigned Interest:

	 	 	 	 	 	 	 	 	 	 	 	 	 
	 	 	Aggregate Amount of	 	 	Amount of	 	 	 	 
	 	 	Commitment/Loans for	 	 	Commitment/Loans	 	 	Percentage Assigned of	 
	 	 	all Lenders*	 	 	Assigned*	 	 	Commitment/Loans	 
	Revolving Loans:
	 	$	 	 	 	$	 	 	 	 	%	 
	 
	 	 	 	 	 	 	 	 	 
	Total:
	 	$	 	 	 	$	 	 	 	 	%	 
	 
	 	 	 	 	 	 	 	 	 

[7.      Trade Date: ________________ ]

Effective Date:
 _____ 
, 20
 _____ 
[TO BE INSERTED BY ADMINISTRATIVE AGENT AND WHICH SHALL BE
THE EFFECTIVE DATE OF RECORDATION OF TRANSFER IN THE REGISTER THEREFOR.]

	 
	The terms set forth in this Assignment and Assumption are hereby agreed to:

	 	 	 	 	 
	 	 	ASSIGNOR
	 	 	[NAME OF ASSIGNOR]
	 
	 	 	 	 
	 

	 	By:	 	 
	 

	 	 	 	 
	 

	 	 	 	Title:
	 
	 	 	 	 
	 	 	ASSIGNEE

[NAME OF ASSIGNEE]
	 
	 	 	 	 
	 

	 	By:	 	 
	 

	 	 	 	 
	 

	 	 	 	Title:

*Amount to be adjusted by the counterparties to take into account any payments or prepayments made
between the Trade Date and the Effective Date.

	 	 	 	 	 
	Consented to and Accepted:

 	 	 
	[NAME OF ADMINISTRATIVE AGENT], as

Administrative Agent	 	 
	 
	 	 	 	 
	By
	 	 	 	 
	 

	 	 	 	 
	 

	 	Title:	 	 
	 
	 	 	 	 
	[Consented to:]	 	 
	 
	 	 	 	 
	ALLIS-CHALMERS ENERGY INC.

a Delaware corporation	 	 
	 
	 	 	 	 
	By
	 	 	 	 
	 

	 	 	 	 
	Name:
	 	 	 	 
	Title:
	 	 	 	 

First Amendment to Allis-Chalmers

Energy Credit Agreement

 

Supplemental Exhibit D Page 2

 

ANNEX 1

TO ASSIGNMENT AND ASSUMPTION

STANDARD TERMS AND CONDITIONS FOR

ASSIGNMENT AND ASSUMPTION

	1.	 	Representations and Warranties.

1.1 Assignor. The Assignor (a) represents and warrants that (i) it is the legal and
beneficial owner of the Assigned Interest, (ii) the Assigned Interest is free and clear of any
lien, encumbrance or other adverse claim and (iii) it has full power and authority, and has taken
all action necessary, to execute and deliver this Assignment and Assumption and to consummate the
transactions contemplated hereby; and (b) assumes no responsibility with respect to (i) any
statements, warranties or representations made in or in connection with the Credit Agreement or any
other Loan Document, (ii) the execution, legality, validity, enforceability, genuineness,
sufficiency or value of the Loan Documents or any collateral thereunder, (iii) the financial
condition of the Borrower, any of its Subsidiaries or Affiliates or any other Person obligated in
respect of any Loan Document or (iv) the performance or observance by the Borrower, any of its
Subsidiaries or Affiliates or any other Person of any of their respective obligations under any
Loan Document.

1.2. Assignee. The Assignee (a) represents and warrants that (i) it has full power and
authority, and has taken all action necessary, to execute and deliver this Assignment and
Assumption and to consummate the transactions contemplated hereby and to become a Lender under the
Credit Agreement, (ii) it meets all requirements of an Eligible Assignee under the Credit Agreement
(subject to receipt of such consents as may be required under the Credit Agreement), (iii) from and
after the Effective Date, it shall be bound by the provisions of the Credit Agreement as a Lender
thereunder and, to the extent of the Assigned Interest, shall have the obligations of a Lender
thereunder, (iv) it has received a copy of the Credit Agreement, together with copies of the most
recent financial statements delivered pursuant to Section 6.01 thereof, as applicable, and such
other documents and information as it has deemed appropriate to make its own credit analysis and
decision to enter into this Assignment and Assumption and to purchase the Assigned Interest on the
basis of which it has made such analysis and decision independently and without reliance on the
Administrative Agent or any other Lender, and (v) if it is a Foreign Lender, attached to the
Assignment and Assumption is any documentation required to be delivered by it pursuant to the terms
of the Credit Agreement, duly completed and executed by the Assignee; and (b) agrees that (i) it
will, independently and without reliance on the Administrative 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 the Loan Documents,
and (ii) it will perform in accordance with their terms all of the obligations which by the terms
of the Loan Documents are required to be performed by it as a Lender.

2. Payments. From and after the Effective Date, the Administrative Agent shall make
all payments in respect of the Assigned Interest (including payments of principal, interest, fees
and other amounts) to the Assignor for amounts which have accrued to but excluding the Effective
Date and to the Assignee for amounts which have accrued from and after the Effective Date.

3. General Provisions. This Assignment and Assumption shall be binding upon, and inure
to the benefit of, the parties hereto and their respective successors and assigns. This Assignment
and Assumption may be executed in any number of counterparts, which together shall constitute one
instrument. Delivery of an executed counterpart of a signature page of this Assignment and
Assumption by telecopy shall be effective as delivery of a manually executed counterpart of this
Assignment and
Assumption. This Assignment and Assumption shall be governed by, and construed in accordance
with, the law of the State of Texas.

First Amendment to Allis-Chalmers

Energy Credit Agreement

 

Supplemental Exhibit D Page 3

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