Purchase Agreement, dated July 12, 2012



 Exhibit 10.1 
 PURCHASE AGREEMENT 
 July 12, 2012 

MERRILL LYNCH, PIERCE, FENNER & SMITH 

INCORPORATED 
 As Representative of the Initial Purchasers 
 One Bryant Park 

New York, New York 10036 
 Ladies and Gentlemen:

 Introductory. Unit Corporation, a Delaware corporation (the “Company”), proposes
to issue and sell to Merrill Lynch, Pierce, Fenner & Smith Incorporated (“Merrill Lynch”) and the other several Initial Purchasers named in Schedule A (the “Initial Purchasers”), acting severally and not
jointly, the respective amounts set forth in such Schedule A of $400 million aggregate principal amount of the Company’s
6 5/8% Senior Subordinated Notes due 2021 (the
“Notes”). Merrill Lynch has agreed to act as the representative of the several Initial Purchasers (the “Representative”) in connection with the offering and sale of the Notes. 

The Securities (as defined below) will be issued pursuant to an indenture, to be dated as of July 24, 2012 (the
“Indenture”), among the Company, the Guarantors (as defined below) and Wilmington Trust, National Association, as trustee (the “Trustee”). Notes will be issued only in book-entry form in the name of Cede &
Co., as nominee of The Depository Trust Company (the “Depositary”) pursuant to a letter of representations, to be dated on or before the Closing Date (as defined in Section 2 hereof) (the “DTC Agreement”),
among the Company, the Trustee and the Depositary. 
 The Securities are being offered and sold as part of the financing in
connection with the consummation of the transactions contemplated by the Purchase and Sale Agreement, dated as of July 10, 2012 (the “Purchase and Sale Agreement”), by and between the Company, Unit Petroleum Company, an
Oklahoma corporation, and Noble Energy, Inc., a Delaware corporation, (the “Acquisition”). The net proceeds from the sale of the Securities (as defined below) will be used to partially finance the Acquisition. 

If the Acquisition has not been consummated on or prior to November 30, 2012 or if, prior to such date, the Purchase and Sale
Agreement is terminated, the Company will be obligated to redeem all of the Notes on the Special Mandatory Redemption Date at the Special Redemption Price. The “Special Mandatory Redemption Date” means the earlier to occur of
(1) December 7, 2012 or (2) the 5th business day following the termination of the Purchase and Sale Agreement for any reason; and the “Special Redemption Price” means (a) if the Special Mandatory Redemption Date
occurs on or prior to September 30, 2012, 98.75% of the aggregate principal amount of the notes being redeemed or (b) if the Special Mandatory Redemption Date occurs after September 30, 2012, 99.75% of the aggregate principal amount
of the notes being redeemed, in each case, plus accrued and unpaid interest from May 15, 2012 to but excluding the Special Mandatory Redemption Date. 

  
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 The holders of the Notes will be entitled to the benefits of a
registration rights agreement, to be dated as of the Closing Date (the “Registration Rights Agreement”), among the Company, the Guarantors and the Initial Purchasers, pursuant to which the Company and the Guarantors will be required
to file with the Commission (as defined below), under the circumstances set forth therein, (i) a registration statement under the Securities Act (as defined below) relating to the Company’s 6 5/8% Senior Subordinated Notes due 2021 (the “Exchange
Notes”) to be issued under an Indenture, dated as of May 18, 2011, among the Company, the guarantors named therein and Wilmington Trust, National Association (f/k/a Wilmington Trust, FSB), as trustee, (as supplemented, the
“Existing Indenture”) and offered in exchange for the Notes (the “Exchange Offer”) and (ii) if required, a shelf registration statement pursuant to Rule 415 of the Securities Act relating to the resale by
certain holders of the Notes, and in each case, to use its commercially reasonable efforts to cause such registration statements to be declared effective. All references herein to the Exchange Notes and the Exchange Offer are only applicable if the
Company and the Guarantors are in fact required to consummate the Exchange Offer pursuant to the terms of the Registration Rights Agreement. 
 The payment of principal of, premium, if any, and interest on the Notes will be fully and unconditionally guaranteed on a senior unsecured basis, jointly and severally by (i) the entities listed on
the signature pages hereof as “Guarantors” and (ii) any subsidiary of the Company formed or acquired after the Closing Date that executes an additional guarantee in accordance with the terms of the Indenture, and their respective
successors and assigns (collectively, the “Guarantors”), pursuant to their guarantees (the “Guarantees”). The Notes and the Guarantees attached thereto are herein collectively referred to as the
“Securities”; and the Exchange Notes and the Guarantees attached thereto are herein collectively referred to as the “Exchange Securities.” 
 This Agreement, the Registration Rights Agreement, the DTC Agreement, the Securities, the Exchange Securities, the Purchase and Sale Agreement, the Credit Facility Consent (as defined below), the
Indenture and the Existing Indenture are referred to herein as the “Transaction Documents.” 
 The Company
understands that the Initial Purchasers propose to make an offering of the Securities on the terms and in the manner set forth herein and in the Pricing Disclosure Package (as defined below) and agrees that the Initial Purchasers may resell, subject
to the conditions set forth herein, all or a portion of the Securities to purchasers (the “Subsequent Purchasers”) on the terms set forth in the Pricing Disclosure Package (the first time when sales of the Securities are made is
referred to as the “Time of Sale”). The Securities are to be offered and sold to or through the Initial Purchasers without being registered with the Securities and Exchange Commission (the “Commission”) under the
Securities Act of 1933 (as amended, the “Securities Act,” which term, as used herein, includes the rules and regulations of the Commission promulgated thereunder), in reliance upon exemptions therefrom. Pursuant to the terms of the
Securities and the Indenture, investors that acquire Securities shall be deemed to have agreed that Securities may only be resold or otherwise transferred if such Securities are registered for sale under the Securities Act or if an exemption from
the registration requirements of the Securities Act is available (including the exemptions afforded by Rule 144A under the Securities Act (“Rule 144A”) or Regulation S under the Securities Act (“Regulation S”)).


  
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 The Company has prepared and delivered to each Initial Purchaser copies of a Preliminary
Offering Memorandum, dated July 12, 2012 (the “Preliminary Offering Memorandum”), and has prepared and delivered to each Initial Purchaser copies of a Pricing Supplement, dated July 12, 2012 in the form attached hereto as
Exhibit A (the “Pricing Supplement”), describing the terms of the Securities, each for use by such Initial Purchaser in connection with its solicitation of offers to purchase the Securities. The Preliminary Offering
Memorandum and the Pricing Supplement are herein referred to as the “Pricing Disclosure Package.” Promptly after this Agreement is executed and delivered, the Company will prepare and deliver to each Initial Purchaser a final
offering memorandum dated the date hereof (the “Final Offering Memorandum”). 
 All references herein to the
terms “Pricing Disclosure Package” and “Final Offering Memorandum” shall be deemed to mean and include all information filed under the Securities Exchange Act of 1934 (as amended, the “Exchange Act,” which term,
as used herein, includes the rules and regulations of the Commission promulgated thereunder) prior to the Time of Sale and incorporated by reference in the Pricing Disclosure Package (including the Preliminary Offering Memorandum) or the Final
Offering Memorandum (as the case may be), and all references herein to the terms “amend,” “amendment” or “supplement” with respect to the Final Offering Memorandum shall be deemed to mean and
include all information filed under the Exchange Act after the Time of Sale and incorporated by reference in the Final Offering Memorandum. 
 The Company and the Guarantors each hereby confirms its agreement with the Initial Purchasers as follows: 
 SECTION 1. Representations and Warranties. Each of the Company and the Guarantors, jointly and severally, hereby represents, warrants and covenants to each Initial Purchaser that, as of the date
hereof and as of the Closing Date (references in this Section 1 to the “Offering Memorandum” are to (x) the Pricing Disclosure Package in the case of representations and warranties made as of the date hereof and
(y) the Final Offering Memorandum in the case of representations and warranties made as of the Closing Date): 
 (a) No Registration Required. Subject to compliance by the Initial Purchasers with the representations and warranties set forth in Section 2 hereof and with the procedures set forth in
Section 7 hereof, it is not necessary in connection with the offer, sale and delivery of the Securities to the Initial Purchasers and to each Subsequent Purchaser in the manner contemplated by this Agreement and the Offering Memorandum to
register the Securities under the Securities Act or to qualify the Indenture under the Trust Indenture Act of 1939 (the “Trust Indenture Act,” which term, as used herein, includes the rules and regulations of the Commission
promulgated thereunder). 
 (b) No Integration of Offerings or General Solicitation. None of the Company,
its affiliates (as such term is defined in Rule 501 under the Securities Act) (each, an “Affiliate”), or any person acting on its or any of their behalf (other than the Initial Purchasers, as to whom the Company makes no
representation or warranty) has, directly or indirectly, solicited any offer to buy or offered to sell, or will, directly or indirectly, solicit any offer to buy or offer to sell, in the United States or to any United States citizen or resident, any
security which is or would be integrated with the sale of the Securities in a 

  
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manner that would require the Securities to be registered under the Securities Act. None of the Company, its Affiliates, or any person acting on its or their behalf (other than the Initial
Purchasers, as to whom the Company makes no representation or warranty) has engaged or will engage, in connection with the offering of the Securities, in any form of general solicitation or general advertising within the meaning of Rule 502 under
the Securities Act. With respect to those Securities sold in reliance upon Regulation S, (i) none of the Company, its Affiliates or any person acting on its or their behalf (other than the Initial Purchasers, as to whom the Company makes no
representation or warranty) has engaged or will engage in any directed selling efforts within the meaning of Regulation S and (ii) each of the Company, its Affiliates, and any person acting on its or any of their behalf (other than the Initial
Purchasers, as to whom the Company makes no representation or warranty) has complied and will comply with the offering restrictions set forth in Regulation S. 
 (c) Eligibility for Resale under Rule 144A. When issued on the Closing Date, the Securities will be eligible for resale pursuant to Rule 144A and will not be, at the Closing Date, of the same class
as securities listed on a national securities exchange registered under Section 6 of the Exchange Act or quoted in a U.S. automated inter-dealer quotation system. 

(d) The Pricing Disclosure Package and Offering Memorandum. Neither the Pricing Disclosure Package, as of the Time
of Sale, nor the Final Offering Memorandum, as of its date or (as amended or supplemented in accordance with Section 3(a), as applicable) as of the Closing Date, contains or will contain an untrue statement of a material fact or omits to state
a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that this representation, warranty and agreement shall not apply to statements in or omissions
from the Pricing Disclosure Package, the Final Offering Memorandum or any amendment or supplement thereto made in reliance upon and in conformity with information furnished to the Company in writing by any Initial Purchaser through the
Representative expressly for use in the Pricing Disclosure Package, the Final Offering Memorandum or amendment or supplement thereto, as the case may be. The Pricing Disclosure Package contains, and the Final Offering Memorandum will contain, all
the information specified in, and meeting the requirements of, Rule 144A. The Company has not distributed and will not distribute, prior to the later of the Closing Date and the completion of the Initial Purchasers’ distribution of the
Securities, any offering material in connection with the offering and sale of the Securities other than the Pricing Disclosure Package and the Final Offering Memorandum. 

(e) Company Additional Written Communications. The Company has not prepared, made, used, authorized, approved or
distributed and will not prepare, make, use, authorize, approve or distribute any written communication that constitutes an offer to sell or solicitation of an offer to buy the Securities other than (i) the Pricing Disclosure Package,
(ii) the Final Offering Memorandum and (iii) any electronic road show or other written communications, in each case used in accordance with Section 3(a). Each such communication by the Company or its agents and representatives
pursuant to clause (iii) of the preceding sentence (each, a “Company Additional Written Communication”), 

  
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when taken together with the Pricing Disclosure Package, did not as of the Time of Sale, and at the Closing Date will not, contain any untrue statement of a material fact or omit to state a
material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that this representation, warranty and agreement shall not apply to statements in or omissions
from each such Company Additional Written Communication made in reliance upon and in conformity with information furnished to the Company in writing by any Initial Purchaser through the Representative expressly for use in any Company Additional
Written Communication. 
 (f) Incorporated Documents. The documents incorporated or deemed to be
incorporated by reference in the Offering Memorandum at the time they were or hereafter are filed with the Commission (collectively, the “Incorporated Documents”) complied and will comply in all material respects with the
requirements of the Exchange Act. Each such Incorporated Document, when taken together with the Pricing Disclosure Package, did not as of the Time of Sale, and at the Closing Date will not, contain any untrue statement of a material fact or omit to
state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. 
 (g) The Purchase Agreement. This Agreement has been duly authorized, executed and delivered by the Company and the Guarantors. 

(h) The Registration Rights Agreement and DTC Agreement. The Registration Rights Agreement has been duly authorized
and, on the Closing Date, will have been duly executed and delivered by, and, assuming the due authorization, execution and delivery thereof by the other parties thereto, will constitute a valid and binding agreement of, the Company and the
Guarantors, enforceable in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies
of creditors or by general equitable principles and except as rights to indemnification may be limited by applicable law. The DTC Agreement has been duly authorized and, on the Closing Date, will have been duly executed and delivered by, and,
assuming the due authorization, execution and delivery thereof by the other parties thereto, will constitute a valid and binding agreement of, the Company, enforceable in accordance with its terms, except as the enforcement thereof may be limited by
bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles. 

(i) Authorization of the Notes, the Guarantees and the Exchange Notes. The Notes to be purchased by the Initial
Purchasers from the Company will on the Closing Date be in the form contemplated by the Indenture, have been duly authorized by the Company for issuance and sale pursuant to this Agreement and the Indenture and, at the Closing Date, will have been
duly executed by the Company and, when authenticated in the manner provided for in the Indenture and delivered against payment of the purchase price therefor, will constitute valid and binding obligations of the Company, enforceable in accordance
with their terms, except as the enforcement thereof may be limited by 

  
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bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles and
will be entitled to the benefits of the Indenture. The Exchange Notes have been duly and validly authorized for issuance by the Company, and when issued and authenticated in accordance with the terms of the Existing Indenture, the Registration
Rights Agreement and the Exchange Offer, will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, except as the enforcement thereof may be limited by bankruptcy, insolvency,
fraudulent transfer, reorganization, moratorium, or similar laws relating to or affecting enforcement of the rights and remedies of creditors or by general principles of equity and will be entitled to the benefits of the Indenture. The Guarantees of
the Notes on the Closing Date and the Guarantees of the Exchange Notes, when issued, will be in the respective forms contemplated by the Indenture and have been duly authorized by the Guarantors for issuance pursuant to this Agreement and the
Indenture; the Guarantees of the Notes, at the Closing Date, will have been duly executed by each of the Guarantors and, when the Notes have been authenticated in the manner provided for in the Indenture and issued and delivered against payment of
the purchase price therefor, the Guarantees of the Notes will constitute valid and binding agreements of the Guarantors; and, when the Exchange Notes have been authenticated in the manner provided for in the Existing Indenture and issued and
delivered in accordance with the Registration Rights Agreement, the Guarantees of the Exchange Notes will constitute valid and binding agreements of the Guarantors, in each case enforceable in accordance with their terms, except as the enforcement
thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles and will be entitled to the
benefits of the Indenture. 
 (j) Authorization of the Indenture. The Indenture has been duly authorized
by the Company and the Guarantors and, at the Closing Date, will have been duly executed and delivered by the Company and the Guarantors and will constitute a valid and binding agreement of the Company and the Guarantors, enforceable against the
Company and the Guarantors in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other similar laws relating to or affecting the rights and
remedies of creditors or by general equitable principles. 
 (k) Description of the Transaction Documents.
The Transaction Documents will conform in all material respects to the respective statements relating thereto contained in the Offering Memorandum. 
 (l) No Material Adverse Change. Except as otherwise disclosed in the Offering Memorandum (exclusive of any amendment or supplement thereto): (i) there has been no material adverse change, or
any development that could reasonably be expected to result in a material adverse change in the condition (financial or otherwise), earnings, business, properties, operations or prospects, whether or not arising from transactions in the ordinary
course of business, of the Company and its subsidiaries, considered as one entity (any such change is called a “Material Adverse Change”); (ii) the Company and its subsidiaries, considered as one entity, have not incurred any
liability or obligation, in- 

  
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direct, direct or contingent, nor entered into any material transaction or agreement, in each case, that is material to the Company and its subsidiaries taken as a whole; and (iii) there has
been no dividend or distribution of any kind declared, paid or made by the Company or, except for dividends paid to the Company or other subsidiaries, any of its subsidiaries on any class of capital stock or repurchase or redemption by the Company
or any of its subsidiaries of any class of capital stock. 
 (m) Exchange Act Compliance. The Company is
subject to and in compliance in all material respects with the reporting requirements of Section 13 or 15(d) of the Exchange Act. 
 (n) Independent Accountants. PricewaterhouseCoopers LLP, which expressed its opinion with respect to the financial statements (which term as used in this Agreement includes the related notes
thereto) and supporting schedules filed with the Commission, if any, included or incorporated by reference in the Offering Memorandum is an independent registered public accounting firm within the meaning of the Securities Act, the Exchange Act and
the rules of the Public Company Accounting Oversight Board, and any non-audit services provided by PricewaterhouseCoopers LLP, to the Company or any of the Guarantors have been approved by the Audit Committee of the Board of Directors of the
Company. 
 (o) Preparation of Financial Statements. The financial statements together with the related
notes filed with the Commission and included or incorporated by reference in the Offering Memorandum present fairly the consolidated financial position of the Company and its subsidiaries as of and at the dates indicated and the results of their
operations and cash flows for the periods specified. The supporting schedules, if any, included or incorporated by reference in the Offering Memorandum present fairly the information required to be stated therein. Such financial statements and
supporting schedules, if any, comply as to form with the applicable accounting requirements of Regulation S-X and have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) applied on a consistent
basis throughout the periods involved, except as may be expressly stated in the related notes thereto. The financial data set forth in the Offering Memorandum under the captions “Summary–Summary Historical Consolidated Financial Data”
and “Selected Historical Consolidated Financial Data” fairly present the information set forth therein on a basis consistent with that of the audited financial statements contained in the Offering Memorandum. The interactive data in
eXtensible Business Reporting Language included or incorporated by reference in the Offering Memorandum and the Pricing Disclosure Package fairly present the information called for in all material respects and have been prepared in accordance with
the Commission’s rules and guidelines applicable thereto. 
 (p) Incorporation and Good Standing of the
Company and its Subsidiaries. Each of the Company and its subsidiaries has been duly incorporated or formed and is validly existing in good standing under the laws of the jurisdiction of its incorporation or formation and has the requisite power
and authority, corporate or other, to own or lease, as the case may be, and operate its properties and to conduct its business as described in the Offering Memorandum and, in the case of the Company and the
Guaran-

  
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tors, to enter into and perform its obligations under each of the Transaction Documents to which it is a party. Each of the Company and each Guarantor is duly qualified as a foreign corporation
or other entity to transact business and is in good standing in each jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except for such jurisdictions where the
failure to so qualify or to be in good standing would not, individually or in the aggregate, reasonably be expected to result in a Material Adverse Change. All of the issued and outstanding shares of capital stock or other ownership interests of
each subsidiary have been duly authorized and validly issued, are fully paid and nonassessable and are owned by the Company, directly or through subsidiaries, free and clear of any security interest, mortgage, pledge, lien, encumbrance or claim. The
Company does not own or control, directly or indirectly, any corporation, association or other entity other than the subsidiaries listed in Exhibit 21 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2011.

 (q) Non-Contravention of Existing Instruments; No Further Authorizations or Approvals Required. Neither
the Company nor any of its subsidiaries is (i) in violation or in default (or, with the giving of notice or lapse of time or both, would be in default) (“Default”) under its charter, bylaws or similar organizational documents,
(ii) in Default under any indenture, mortgage, loan or credit agreement, deed of trust, note, contract, franchise, lease or other agreement or instrument to which the Company or any of its subsidiaries is a party or by which it or any of them
may be bound (including, without limitation, the Existing Indenture and the Company’s Senior Credit Agreement (the “Senior Credit Agreement”), dated as of September 13, 2011, among the Company, certain of the
Company’s subsidiaries, the lenders listed therein, BOKF, NA, DBA Bank of Oklahoma, as administrative agent and with Compass Bank as joint-lead arrangers, joint bookrunners and co-syndication agents, and Bank of America, N.A. and Bank of
Montreal as co-documentation agents), or to which any of the property or assets of the Company or any of its subsidiaries is subject (each, an “Existing Instrument”), or (iii) in violation of any statute, law, rule, regulation,
judgment, order or decree of any court, regulatory body, administrative agency, governmental body, arbitrator or other authority having jurisdiction over the Company or any of its subsidiaries or any of its properties, except, with respect to clause
(ii) only, for such Defaults as would not, individually or in the aggregate, reasonably be expected to result in a Material Adverse Change. The execution, delivery and performance of the Transaction Documents by the Company and the Guarantors
party thereto, and the issuance and delivery of the Securities and the Exchange Securities, and consummation of the transactions contemplated hereby and thereby and by the Offering Memorandum (i) have been duly authorized by all necessary
corporate (or similar) action and will not result in Default under the charter or bylaws or similar organizational document of the Company or any of its subsidiaries, (ii) will not constitute a Default or a Debt Repayment Triggering Event (as
defined below) under, or result in the creation or imposition of any lien, charge or encumbrance upon any property or assets of the Company or any of its subsidiaries pursuant to, or require the consent of any other party to, any Existing
Instrument, and (iii) will not result in any violation of any statute, law, rule, regulation, judgment, order or decree applicable to the Company or any of its subsidiaries of any court, regulatory body, administrative agency, governmental
body, arbitrator or other authority having jurisdiction over the Company or any of its sub- 

  
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sidiaries or any of its or their properties. No consent, approval, authorization or other order of, or registration or filing with, any court or other governmental or regulatory authority or
agency is required for the execution, delivery and performance of the Transaction Documents by the Company or the Guarantors to the extent a party thereto, or the issuance and delivery of the Securities or the Exchange Securities, or consummation of
the transactions contemplated hereby and thereby and by the Offering Memorandum, except such as have been obtained or made by the Company or the Guarantors and are in full force and effect under the Securities Act, applicable securities laws of the
several states of the United States or provinces of Canada and except such as may be required by the securities laws of the several states of the United States or provinces of Canada with respect to the Company’s and the Guarantors’
obligations under the Registration Rights Agreement. As used herein, a “Debt Repayment Triggering Event” means any event or condition which gives, or with the giving of notice or lapse of time would give, the holder of any note,
debenture or other evidence of indebtedness (or any person acting on such holder’s behalf) the right to require the repurchase, redemption or repayment of all or a portion of such indebtedness by the Company or any of its subsidiaries.

 (r) No Material Actions or Proceedings. There are no legal or governmental actions, suits or
proceedings pending or, to the best of the Company’s and the Guarantors’ knowledge, threatened (i) against or affecting the Company or any of its subsidiaries, (ii) which have as the subject thereof any officer or director of, or
property owned or leased by, the Company or any of its subsidiaries or (iii) relating to environmental or discrimination matters, where in any such case (A) there is a reasonable possibility that such action, suit or proceeding might be
determined adversely to the Company or such subsidiary, or any officer or director of, or property owned or leased by the Company or any of its subsidiaries and (B) any such action, suit or proceeding, if so determined adversely, would
reasonably be expected to result in a Material Adverse Change or adversely affect the consummation of the transactions contemplated by this Agreement. 
 (s) Intellectual Property Rights. The Company and its subsidiaries own, possess, license or have other rights to use, on reasonable terms, all patents, patent applications, trade and service marks,
trade and service mark registrations, trade names, copyrights, licenses, inventions, trade secrets, technology, know-how and other intellectual property (collectively, the “Intellectual Property”) necessary for the conduct of the
Company’s business as now conducted or as proposed in each of the Pricing Disclosure Package and the Offering Memorandum to be conducted. Except as disclosed in the Pricing Disclosure Package and the Offering Memorandum, (a) no party has
been granted an exclusive license to use any portion of such Intellectual Property owned by the Company; (b) to the best of the knowledge of the Company and the Guarantors, there is no material infringement by third parties of any such
Intellectual Property owned by or exclusively licensed to the Company and its subsidiaries; (c) there is no pending or, to the best of the knowledge of the Company and the Guarantors, threatened action, suit, proceeding or claim by others
challenging the rights of the Company and its subsidiaries in or to any material Intellectual Property, and the Company and the Guarantors are unaware of any facts which would form a reasonable basis for any such claim; (d) there is no pending
or, to the best of the knowledge of the Company and the Guarantors, threatened action, suit, proceeding or claim by others challenging the validity or scope of any such Intellectual 

  
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Property, and the Company and the Guarantors are unaware of any facts which would form a reasonable basis for any such claim; and (e) there is no pending or, to the best of the knowledge of
the Company and the Guarantors, threatened action, suit, proceeding or claim by others that the Company’s business as now conducted infringes or otherwise violates any patent, trademark, copyright, trade secret or other proprietary rights of
others, and the Company and the Guarantors are unaware of any other fact which would form a reasonable basis for any such claim. 
 (t) All Necessary Permits, etc. The Company and each of its subsidiaries possess such valid and current licenses, certificates, authorizations or permits issued by the appropriate state, federal or
foreign regulatory agencies or bodies necessary to conduct their respective businesses, and neither the Company nor any of its subsidiaries has received any notice of proceedings relating to the revocation or modification of, or non-compliance with,
any such license, certificate, authorization or permit which, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would reasonably be expected to result in a Material Adverse Change. 

(u) Title to Properties. The Company and each of its subsidiaries has (i) generally satisfactory title to all
its interests in its oil and gas properties, title investigations having been carried out by the Company and each of its subsidiaries in accordance with the general practice in the oil and gas industry, and (ii) good and (in the case of real
property only) marketable title to all the properties and assets reflected as owned in the financial statements referred to in Section 1(o) above (or elsewhere in the Offering Memorandum), in each case free and clear of any security interests,
mortgages, liens, encumbrances, claims and other defects, except such as do not materially and adversely affect the value of such property and do not materially interfere with the use made or proposed to be made of such property by the Company or
such subsidiary. The real property, improvements, equipment and personal property held under lease by the Company or any of its subsidiaries are held under valid and enforceable leases, with such exceptions as do not materially interfere with the
use made or proposed to be made of such real property, improvements, equipment or personal property by the Company or such subsidiary. 
 (v) Tax Law Compliance. The Company and its subsidiaries have filed all necessary federal, state, local and foreign income and franchise tax returns in a timely manner and have paid all taxes
required to be paid by any of them and, if due and payable, any related or similar assessment, fine or penalty levied against any of them, except for any taxes, assessments, fines or penalties as may be being contested in good faith and by
appropriate proceedings. The Company has made appropriate provisions in the applicable financial statements referred to in Section 1(o) above in respect of all federal, state, local and foreign income and franchise taxes for all current or
prior periods as to which the tax liability of the Company or any of its subsidiaries has not been finally determined. 
 (w) Company and Guarantors Not an “Investment Company”. Neither the Company nor any Guarantor is, or after receipt of payment for the Securities and the application of the proceeds
thereof as contemplated under the caption “Use of Proceeds” in the Offering Memorandum will be, an “investment company” within the meaning of 

  
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the Investment Company Act of 1940, as amended (the “Investment Company Act,” which term, as used herein, includes the rules and regulations of the Commission promulgated
thereunder), and the Company and each Guarantor will conduct its business in a manner so that it will not become subject to the Investment Company Act. 
 (x) Insurance. Each of the Company and its subsidiaries are insured by recognized, financially sound and reputable institutions with policies in such amounts and with such deductibles and covering
such risks as are generally deemed adequate and customary for their businesses including, but not limited to, policies covering real and personal property owned or leased by the Company and its subsidiaries against theft, damage, destruction, acts
of vandalism and earthquakes. All policies of insurance insuring the Company or any of its subsidiaries or their respective businesses, assets, employees, officers and directors are in full force and effect; the Company and its subsidiaries are in
compliance with the terms of such policies and instruments in all material respects; and there are no claims by the Company or any of its subsidiaries under any such policy or instrument as to which any insurance company is denying liability or
defending under a reservation of rights clause; and neither the Company nor any such subsidiary has been refused any insurance coverage sought or applied for. The Company has no reason to believe that it or any subsidiary will not be able
(i) to renew its existing insurance coverage as and when such policies expire or (ii) to obtain comparable coverage from similar institutions as may be necessary or appropriate to conduct its business as now conducted and at a cost that
would not result in a Material Adverse Change. 
 (y) No Price Stabilization or Manipulation. None of the
Company or any of the Guarantors has taken or will take, directly or indirectly, any action designed to or that might be reasonably expected to cause or result in stabilization or manipulation of the price of any security of the Company to
facilitate the sale or resale of the Securities. 
 (z) No Restrictions on Dividends. No subsidiary
of the Company is currently prohibited, directly or indirectly, from paying any dividends to the Company, from making any other distribution on such subsidiary’s shares of capital stock or other ownership interests, from repaying to the Company
any loans or advances to such subsidiary from the Company or from transferring any of such subsidiary’s property or assets to the Company or any other subsidiary of the Company, except as described in or contemplated by the Offering Memorandum.

 (aa) Solvency. The Company and the Guarantors taken as a whole are, and immediately after (i) the
Closing Date and (ii) the consummation of the Acquisition will be, Solvent. As used herein, the term “Solvent” means, with respect to any person on a particular date, that on such date (i) the fair market value of the
assets of such person is greater than the total amount of liabilities (including contingent liabilities) of such person, (ii) the present fair salable value of the assets of such person is greater than the amount that will be required to pay
the probable liabilities of such person on its debts as they become absolute and matured, (iii) such person is able to realize upon its assets and pay its debts and other liabilities, including contingent obligations, as they mature and
(iv) such person does not have unreasonably small capital. 

  
 11 









 (bb) Compliance with Sarbanes-Oxley. The Company and its directors
and officers, in their capacities as such, are in compliance in all material respects with the applicable provisions of the Sarbanes-Oxley Act of 2002 and the rules and regulations promulgated in connection therewith (the “Sarbanes-Oxley
Act”), including Section 402 related to loans and Sections 302 and 906 related to certifications. 

(cc) Disclosure Controls. The Company and its subsidiaries maintain an effective system of “disclosure
controls and procedures” (as defined in Rule 13a-15(e) under the Exchange Act). The Company and its subsidiaries have carried out evaluations of the effectiveness of their disclosure controls and procedures as required by Rule 13a-15 of the
Exchange Act. 
 (dd) Internal Controls and Procedures. The Company maintains (i) effective internal
control over financial reporting as defined in Rule 13a-15 and Rule 15d-15 under the Exchange Act, and (ii) a system of internal accounting controls sufficient to provide reasonable assurance that (A) transactions are executed in
accordance with management’s general or specific authorizations; (B) transactions are recorded as necessary to permit preparation of financial statements in conformity with generally accepted accounting principles and to maintain asset
accountability; (C) access to assets is permitted only in accordance with management’s general or specific authorization; and (D) the recorded accountability for assets is compared with the existing assets at reasonable intervals and
appropriate action is taken with respect to any differences. 
 (ee) No Material Weakness in Internal
Controls. Except as disclosed in the Pricing Disclosure Package and the Offering Memorandum, or in any document incorporated by reference therein, since the end of the Company’s most recent fiscal year, there has been (i) no
material weakness in the Company’s internal control over financial reporting (whether or not remediated) and (ii) no change in the Company’s internal control over financial reporting that has materially affected, or is reasonably
likely to materially affect, the Company’s internal control over financial reporting. 
 (ff) Regulations
T, U, X. None of the transactions contemplated by this Agreement (including, without limitation, the use of the proceeds from the sale of the Securities) will violate or result in a violation of Section 7 of the Exchange Act, or any
regulation promulgated thereunder, including, without limitation, Regulations T, U, and X of the Board of Governors of the Federal Reserve System. 
 (gg) Compliance with and Liability Under Environmental Laws. Except as otherwise disclosed in the Pricing Disclosure Package and the Offering Memorandum, (i) neither the Company nor any of its
subsidiaries is in violation of any federal, state, local or foreign law, regulation, order, permit or other requirement relating to pollution or protection of human health or the environment (including, without limitation, ambient air, surface
water, groundwater, land surface or subsurface strata and natural resources such as wetlands, flora and fauna), including without limitation, laws and regulations relating to emissions, discharges, releases or threatened releases of chemicals,
pollutants, contaminants, pesticides, wastes, toxic substances, hazardous substances, petroleum and petroleum products (collectively, “Materials of Environmental Concern”), or otherwise
re-

  
 12 









 
lating to the manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of Materials of Environment Concern (collectively, “Environmental
Laws”), which violation includes, but is not limited to, noncompliance with any permits or other governmental authorizations required for the operation of the business of the Company or its subsidiaries under applicable Environmental Laws,
or noncompliance with the terms and conditions thereof, nor has the Company or any of its subsidiaries received any written communication, whether from a governmental authority, citizens group, employee or otherwise, that alleges that the Company or
any of its subsidiaries is in violation of any Environmental Law, except as would not reasonably be expected to, individually or in the aggregate, result in a Material Adverse Change; (ii) there is no claim, action or cause of action filed with
a court or governmental authority, no investigation with respect to which the Company has received written notice, and no written notice by any person or entity alleging actual or potential liability under any Environmental Law, including, without
limitation, liability for investigatory costs, cleanup costs, governmental response costs, natural resource damages, property damages, personal injuries, attorneys’ fees or penalties arising out of, based on or resulting from the presence, or
release into the environment, of any Material of Environmental Concern at any location (collectively, “Environmental Claims”), pending or, to the best of the Company’s and the Guarantors’ knowledge, threatened against the
Company or any of its subsidiaries or any person or entity whose liability for any Environmental Claim the Company or any of its subsidiaries has retained or assumed either contractually or by operation of law, except as would not, individually or
in the aggregate, reasonably be expected to result in a Material Adverse Change; (iii) to the best of the Company’s and the Guarantors’ knowledge, there are no past, present or anticipated future actions, activities, circumstances,
conditions, events or incidents, including, without limitation, the release, emission, discharge, presence or disposal of any Material of Environmental Concern, that could reasonably be expected to result in a violation of any Environmental Law,
require expenditures to be incurred pursuant to Environmental Law, or form the basis of a potential Environmental Claim against the Company or any of its subsidiaries or against any person or entity whose liability for any Environmental Claim the
Company or any of its subsidiaries has retained or assumed either contractually or by operation of law, except as would not, individually or in the aggregate, reasonably be expected to result in a Material Adverse Change; and (iv) neither the
Company nor any of its subsidiaries is subject to any pending or, to the best of the knowledge of the Company and the Guarantors, threatened proceeding under Environmental Law to which a governmental authority is a party and which is reasonably
likely to result in monetary sanctions of $100,000 or more. 
 (hh) Periodic Review of Costs of Environmental
Compliance. In the ordinary course of its business, the Company conducts a periodic review of the effect of Environmental Laws on the business, operations and properties of the Company and its subsidiaries, in the course of which it identifies
and evaluates associated costs and liabilities (including, without limitation, any capital or operating expenditures required for clean-up, closure of properties or compliance with Environmental Laws or any permit, license or approval, any related
constraints on operating activities and any potential liabilities to third parties). On the basis of such review and the amount of its established reserves, the Company has reasonably concluded that such associated costs and liabilities would not,
individually or in the aggregate, result in a Material Adverse Change. 

  
 13 









 (ii) ERISA Compliance. Except as would not, individually or in the
aggregate, reasonably be expected to result in a Material Adverse Change, the Company and its subsidiaries and any “employee benefit plan” (as defined under the Employee Retirement Income Security Act of 1974 (as amended,
“ERISA,” which term, as used herein, includes the regulations and published interpretations thereunder)) established or maintained by the Company, its subsidiaries or their ERISA Affiliates (as defined below) are in compliance with
ERISA and, to the knowledge of the Company, each “multiemployer plan” (as defined in Section 4001 of ERISA) to which the Company, its subsidiaries or an ERISA Affiliate contributes (a “Multiemployer Plan”) is in
compliance with ERISA. “ERISA Affiliate” means, with respect to the Company or a subsidiary, any member of any group of organizations described in Section 414 of the Internal Revenue Code of 1986 (as amended, the
“Code,” which term, as used herein, includes the regulations and published interpretations thereunder) of which the Company or such subsidiary is a member. Except as would not, individually or in the aggregate, reasonably be
expected to result in a Material Adverse Change, (i) no “reportable event” (as defined under ERISA) for which the 30-day notice has not been waived as of the date hereof has occurred or is reasonably expected to occur with respect to
any “employee benefit plan” established or maintained by the Company, its subsidiaries or any of their ERISA Affiliates, (ii) no “single employer plan” (as defined in Section 4001 of ERISA) established or maintained by
the Company, its subsidiaries or any of their ERISA Affiliates, if such “employee benefit plan” were terminated, would have any “amount of unfunded benefit liabilities” (as defined under ERISA), and (iii) neither the
Company, its subsidiaries nor any of their ERISA Affiliates has incurred or reasonably expects to incur any liability under (A) Title IV of ERISA with respect to termination of, or withdrawal from, any “employee benefit plan” or
(B) Sections 412, 4971, 4975 or 4980B of the Code. Each “employee benefit plan” established or maintained by the Company, its subsidiaries or any of their ERISA Affiliates that is intended to be qualified under Section 401 of the
Code is so qualified and, to the knowledge of the Company, nothing has occurred, whether by action or failure to act, which would cause the loss of such qualification. 

(jj) Labor Matters. No labor disturbances by the employees of the Company or any of its subsidiaries has
occurred that would, individually or in the aggregate, reasonably be expected to result in a Material Adverse Change. 
 (kk) Related Party Transactions. No relationship, direct or indirect, exists between or among any of the Company or any affiliate of the Company, on the one hand, and any director, officer, member,
stockholder, customer or supplier of the Company or any affiliate of the Company, on the other hand, which is required by the Securities Act to be disclosed in a registration statement on Form S-1 which is not so disclosed in the Offering
Memorandum. There are no outstanding loans, advances (except advances for business expenses in the ordinary course of business) or guarantees of indebtedness by the Company or any affiliate of the Company to or for the benefit of any of the officers
or directors of the Company or any affiliate of the Company or any of their respective family members. 
 (ll)
No Unlawful Contributions or Other Payments. Neither the Company nor any of its subsidiaries nor, to the knowledge of the Company or the Guarantors, any 

  
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director, officer, agent, employee or affiliate of the Company or any of its subsidiaries is aware of or has taken any action, directly or indirectly, that would result in a violation by such
persons of the FCPA, including, without limitation, making use of the mails or any means or instrumentality of interstate commerce corruptly in furtherance of an offer, payment, promise to pay or authorization of the payment of any money, or other
property, gift, promise to give, or authorization of the giving of anything of value to any “foreign official” (as such term is defined in the FCPA) or any foreign political party or official thereof or any candidate for foreign political
office, in contravention of the FCPA and the Company, its subsidiaries and, to the knowledge of the Company and the Guarantors, its affiliates have conducted their businesses in compliance with the FCPA and have instituted and maintain policies and
procedures designed to ensure, and which are reasonably expected to continue to ensure, continued compliance therewith. “FCPA” means Foreign Corrupt Practices Act of 1977, as amended, and the rules and regulations thereunder.

 (mm) Brokers. Other than the underwriting discount pursuant to Section 2 of this Agreement, there
is no broker, finder or other party that is entitled to receive from the Company any brokerage or finder’s fee or other fee or commission as a result of any transactions contemplated by this Agreement. 

(nn) No Default in Senior Indebtedness. No event of default exists under any contract, indenture, mortgage, loan
agreement, note, lease or other agreement or instrument constituting Senior Indebtedness (as defined in the Indenture). 
 (oo) No Conflict with Money Laundering Laws. The operations of the Company and its subsidiaries are and have been conducted at all times in compliance with applicable financial recordkeeping and
reporting requirements of the Currency and Foreign Transactions Reporting Act of 1970, as amended, the money laundering statutes of all applicable jurisdictions, the rules and regulations thereunder and any related or similar rules, regulations or
guidelines issued, administered or enforced by any governmental agency (collectively, the “Money Laundering Laws”) and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator
involving the Company or any of its subsidiaries with respect to the Money Laundering Laws is pending or, to the best knowledge of the Company and the Guarantors, threatened. 

(pp) No Conflict with Sanctions Laws. Neither the Company nor any of its subsidiaries nor, to the knowledge of the
Company and the Guarantors, any director, officer, agent, employee or affiliate of the Company or any of its subsidiaries is currently subject to any U.S. sanctions administered by the Office of Foreign Assets Control of the U.S. Treasury
Department, the U.S. Department of Commerce or the U.S. Department of State (collectively, “Sanctions”), nor is the Company or any of its subsidiaries located, organized or resident in a country or territory that is the subject of
Sanctions. The Company will not, directly or indirectly, use the proceeds of the offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other person, (i) to fund any activities of or
business with any person that, at the time of such funding, is the subject of Sanctions, or is in Burma/Myanmar, Cuba, Iran, Libya, North 

  
 15 









 
Korea, Sudan or in any other country or territory, that, at the time of such funding, is the subject of Sanctions, or (ii) in any other manner that will result in a violation by any person
(including any person participating in the offering, whether as underwriter, advisor, investor or otherwise) of Sanctions. 
 (qq) Ratings. Except as otherwise disclosed in the Pricing Disclosure Package, no “nationally recognized statistical rating organization” as such term is defined for purposes of Rule
436(g)(2) under the Securities Act (i) has imposed (or has informed the Company that it is considering imposing) any condition (financial or otherwise) on the Company’s retaining any rating assigned to the Company, any securities of the
Company or (ii) has indicated to the Company that it is considering (a) the downgrading, suspension, or withdrawal of, or any review for a possible change that does not indicate the direction of the possible change in, any rating so
assigned or (b) any change in the outlook for any rating of the Company or any securities of the Company. 

(rr) Lending Relationship. Except as disclosed in the Pricing Disclosure Package and the Offering Memorandum, the
Company (i) does not have any material lending or other relationship with any bank or lending affiliate of any Initial Purchaser and (ii) does not intend to use any of the proceeds from the sale of the Securities hereunder to repay
any outstanding debt owed to any affiliate of any Initial Purchaser. 
 (ss) Credit Facility Consent. The
consent with respect to the Senior Credit Facility (as described in the Offering Memorandum, the “Credit Facility Consent”), when duly executed and delivered by the Company, will be the valid and legally binding agreement of the
Company, enforceable in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of
creditors or by general equitable principles. 
 (tt) Statistical and Market Related Data. Nothing has
come to the attention of the Company that has caused the Company to believe that the statistical and market-related data included in each of the Pricing Disclosure Package and the Offering Memorandum are not based on or derived from sources that are
reliable and accurate in all material respects. 
 (uu) Reserves Information. Ryder Scott Company L.P.
(“Ryder Scott”), a petroleum engineering firm from whose reserve reports information (the “Reserve Information”) is included or incorporated by reference in the Pricing Disclosure Package and the Offering
Memorandum, are independent petroleum engineers with respect to the Company and its subsidiaries. Other than (i) the production of reserves in the ordinary course of business, (ii) intervening price fluctuations or (iii) as described
in the Pricing Disclosure Package and the Offering Memorandum, the Company is not aware of any facts or circumstances that would result in a Material Adverse Change in its proved reserves in the aggregate, or the aggregate present value of estimated
future net revenues of the Company or the standardized measure of discounted future net cash flows therefrom, as described in the Pricing Disclosure Package and the Offering Memorandum and reflected in the Reserve Information as of the respective
dates such information is given. 

  
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Estimates of the proved reserves and the present value of the estimated future net revenues and the discounted future net cash flows derived therefrom as described in the Pricing Disclosure
Package and the Offering Memorandum and reflected in the Reserve Information comply in all material respects to the applicable requirements of Regulation S-X of the Securities Act Regulations and Industry Guide 2 under the Securities Act.

 (vv) Regulation S. The Company, the Guarantors and their respective affiliates and all persons
authorized to act on their behalf (other than the Initial Purchasers, as to whom the Company and the Guarantors make no representation) have complied with and will comply with the offering restrictions requirements of Regulation S in connection
with the offering of the Securities outside the United States and, in connection therewith, the Offering Memorandum will contain the disclosure required by Rule 902. The Company is a “reporting issuer”, as defined in Rule 902
under the Securities Act. 
 Any certificate signed by an officer of the Company or any Guarantor and delivered to the Initial
Purchasers or to counsel for the Initial Purchasers shall be deemed to be a representation and warranty by the Company or such Guarantor to each Initial Purchaser as to the matters set forth therein. 

SECTION 2. Purchase, Sale and Delivery of the Securities. 

(a) The Securities. Each of the Company and the Guarantors agrees to issue and sell to the Initial Purchasers, severally and not
jointly, all of the Notes and the Guarantees, respectively, and, subject to the conditions set forth herein, the Initial Purchasers agree, severally and not jointly, to purchase from the Company and the Guarantors the aggregate principal amount of
Securities set forth opposite their names on Schedule A, at a purchase price of 96.875% of the principal amount thereof payable on the Closing Date, plus interest accrued since May 15, 2012, in each case, on the basis of the representations,
warranties and agreements herein contained, and upon the terms herein set forth. 
 (b) The Closing Date. Delivery of
certificates for the Securities in definitive form to be purchased by the Initial Purchasers and payment therefor shall be made at the offices of Davis Polk & Wardwell LLP, 450 Lexington Avenue, New York, New York 10017 (or such other place
as may be agreed to by the Company and the Representative) at 9:00 a.m. New York City time, on July 24, 2012, or such other time and date as the Representative shall designate by notice to the Company (the time and date of such closing are
called the “Closing Date”). 
 (c) Delivery of the Securities. The Company shall deliver, or cause to be
delivered, to the Representative for the accounts of the several Initial Purchasers certificates for the Notes at the Closing Date against the irrevocable release of a wire transfer of immediately available funds for the amount of the purchase price
therefor. The certificates for the Notes shall be in such denominations and registered in the name of Cede & Co., as nominee of the Depositary, pursuant to the DTC Agreement, and shall be made available for inspection on the business day
preceding the Closing Date at a location in New York City, as the Representative may designate. Time shall be of the essence, and delivery at the time and place specified in this Agreement is a further condition to the obligations of the Initial
Purchasers. 

  
 17 









 (d) Initial Purchasers as Qualified Institutional Buyers. Each Initial Purchaser
severally and not jointly represents and warrants to, and agrees with, the Company that: 
 (i) it has not
solicited offers for, or offered or sold, and it will not solicit offers for, or offer or sell, Securities as part of the initial offering except to (a) persons who it reasonably believes are “qualified institutional buyers” within
the meaning of Rule 144A (“Qualified Institutional Buyers”) in transactions meeting the requirements of Rule 144A and in connection with each such sale, it has taken or will take reasonable steps to ensure that the purchaser of the
Securities is aware that such sale is being made in reliance on Rule 144A or (b) upon the terms and conditions set forth in Annex I to this Agreement; 

(ii) it is a Qualified Institutional Buyer and an institutional “accredited investor” within the meaning of Rule
501(a)(1), (2), (3) or (7) under the Securities Act; and 
 (iii) it has not solicited offers for, or
offered or sold, and will not solicit offers for or offer or sell Securities by means of any form of general solicitation or general advertising, including but not limited to the methods described in Rule 502(c) under the Securities Act or in any
manner involving a public offering within the meaning of Section 4(2) of the Securities Act. 
 (e) ERISA. The
Initial Purchasers each represent and warrant, and each holder of the Notes will be deemed to have represented and warranted, that from and including the date of its acquisition of any such Notes through and including the date of the disposition of
any such Notes either (i) no portion of the assets used by the Initial Purchaser or such holder to acquire or hold the Notes (or by any beneficial owner with an interest in such Notes) constitutes the assets of any Plan or (ii) its
acquisition, holding and disposition of the Notes will not result in a non-exempt prohibited transaction under Section 406 of ERISA or Section 4975 of the Code or a violation of any applicable Similar Laws. For this purpose,
“Plan” means an employee benefit plan that is subject to Title I of ERISA, a plan or individual retirement account that is subject to Section 4975 of the Code or any entity whose underlying assets include the assets of any such
employee benefit plan, plan or individual retirement account by reason of such employee benefit plan’s, plan’s or individual retirement account’s investment in such entity. “Similar Laws” means the provisions under any
federal, state, local, non-U.S. laws or regulations that are similar to Title I of ERISA or Section 4975 of the Code. 

SECTION 3. Additional Covenants. Each of the Company and the Guarantors, jointly and severally, further covenants and agrees with
each Initial Purchaser as follows: 
 (a) Preparation of Final Offering Memorandum; Initial Purchasers’
Review of Proposed Amendments and Supplements and Company Additional Written Communications. As promptly as practicable following the Time of Sale and in any event not later than the second business day following the date hereof, the Company
will prepare and deliver to the Initial Purchasers the Final Offering Memorandum, which shall consist of the Preliminary Offering Memorandum as modified only by the information contained in the Pricing Supplement. The Company will not amend or
supplement the Preliminary Offering Memorandum or the Pricing Supplement. The Company will not 

  
 18 









 
amend or supplement the Final Offering Memorandum prior to the Closing Date unless the Representative shall previously have been furnished a copy of the proposed amendment or supplement at least
two business days prior to the proposed use or filing, and shall not have objected to such amendment or supplement. Before making, preparing, using, authorizing, approving or distributing any Company Additional Written Communication, the Company
will furnish to the Representative a copy of such written communication for review and will not make, prepare, use, authorize, approve or distribute any such written communication to which the Representative reasonably objects. 

(b) Amendments and Supplements to the Final Offering Memorandum and Other Securities Act Matters. If at any time
prior to the Closing Date (i) any event shall occur or condition shall exist as a result of which any of the Pricing Disclosure Package as then amended or supplemented would include any untrue statement of a material fact or omit to state any
material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading or (ii) it is necessary to amend or supplement any of the Pricing Disclosure Package to comply with
law, the Company and the Guarantors will immediately notify the Initial Purchasers thereof and forthwith prepare and (subject to Section 3(a) hereof) furnish to the Initial Purchasers such amendments or supplements to any of the Pricing
Disclosure Package as may be necessary so that the statements in any of the Pricing Disclosure Package as so amended or supplemented will not, in the light of the circumstances under which they were made, be misleading or so that any of the Pricing
Disclosure Package will comply with all applicable law. If, prior to the completion of the placement of the Securities by the Initial Purchasers with the Subsequent Purchasers, any event shall occur or condition exist as a result of which it is
necessary to amend or supplement the Final Offering Memorandum, as then amended or supplemented, in order to make the statements therein, in the light of the circumstances when the Final Offering Memorandum is delivered to a Subsequent Purchaser,
not misleading, or if in the judgment of the Representative or counsel for the Initial Purchasers it is otherwise necessary to amend or supplement the Final Offering Memorandum to comply with law, the Company and the Guarantors agree to promptly
prepare (subject to Section 3 hereof), file with the Commission and furnish at their own expense to the Initial Purchasers, amendments or supplements to the Final Offering Memorandum so that the statements in the Final Offering Memorandum as so
amended or supplemented will not, in the light of the circumstances at the Closing Date and at the time of sale of Securities, be misleading or so that the Final Offering Memorandum, as amended or supplemented, will comply with all applicable law.

 (c) Copies of the Offering Memorandum. The Company agrees to furnish the Initial Purchasers, without
charge, as many copies of the Pricing Disclosure Package and the Final Offering Memorandum and any amendments and supplements thereto as they shall reasonably request. 

(d) Blue Sky Compliance. Each of the Company and the Guarantors shall cooperate with the Representative and counsel
for the Initial Purchasers to qualify or register (or to obtain exemptions from qualifying or registering) all or any part of the Securities for offer and sale under the securities laws of the several states of the United States, the provinces of
Canada or any other jurisdictions designated by the Representative, shall 

  
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comply with such laws and shall continue such qualifications, registrations and exemptions in effect so long as required for the distribution of the Securities. None of the Company or any of the
Guarantors shall be required to qualify as a foreign corporation or to take any action that would subject it to general service of process in any such jurisdiction where it is not presently qualified or where it would be subject to taxation as a
foreign corporation. The Company will advise the Representative promptly of the suspension of the qualification or registration of (or any such exemption relating to) the Securities for offering, sale or trading in any jurisdiction or any initiation
or threat of any proceeding for any such purpose, and in the event of the issuance of any order suspending such qualification, registration or exemption, each of the Company and the Guarantors shall use its best efforts to obtain the withdrawal
thereof at the earliest possible moment. 
 (e) Use of Proceeds. The Company shall apply the net proceeds
from the sale of the Securities sold by it in the manner described under the caption “Use of Proceeds” in the Pricing Disclosure Package. 
 (f) The Depositary. The Company will cooperate with the Initial Purchasers and use its commercially reasonable efforts to permit the Securities to be eligible for clearance and settlement through
the facilities of the Depositary. 
 (g) Additional Issuer Information. Prior to the completion of the
placement of the Securities by the Initial Purchasers with the Subsequent Purchasers, the Company shall file, on a timely basis, with the Commission and the New York Stock Exchange (the “NYSE”) all reports and documents required to
be filed under Section 13 or 15 of the Exchange Act. Additionally, at any time when the Company is not subject to Section 13 or 15 of the Exchange Act, for the benefit of holders and beneficial owners from time to time of the Securities,
the Company shall furnish, at its expense, upon request, to holders and beneficial owners of Securities and prospective purchasers of Securities, to the extent not available on the Commission’s EDGAR filing system, information
(“Additional Issuer Information”) satisfying the requirements of Rule 144A(d). 
 (h)
Agreement Not To Offer or Sell Additional Securities. During the period of 120 days following the date hereof, the Company will not, without the prior written consent of Merrill Lynch (which consent may be withheld at the sole discretion of
Merrill Lynch), directly or indirectly, sell, offer, contract or grant any option to sell, pledge, transfer or establish an open “put equivalent position” within the meaning of Rule 16a-1 under the Exchange Act, or otherwise dispose of or
transfer, or announce the offering of, or file any registration statement under the Securities Act in respect of, any debt securities of the Company or securities exchangeable for or convertible into debt securities of the Company (other than as
contemplated by this Agreement and to register the Exchange Securities). 
 (i) Future Reports to the Initial
Purchasers. At any time when the Company is not subject to Section 13 or 15 of the Exchange Act and any Securities or Exchange Securities remain outstanding, the Company will furnish to the Representative and, upon request, to each of the
other Initial Purchasers, in each case, to the extent not available on the Commission’s EDGAR filing system or any replacement therefor within 

  
 20 









 
the time periods specified by the Commission’s rules and regulations under Section 13 or 15 of the Exchange Act: (i) as soon as practicable after the end of each fiscal year,
copies of the Annual Report of the Company containing the balance sheet of the Company as of the close of such fiscal year and statements of income, stockholders’ equity and cash flows for the year then ended and the opinion thereon of the
Company’s independent public or certified public accountants; (ii) as soon as practicable after the filing thereof, copies of each proxy statement, Annual Report on Form 10-K, Quarterly Report on Form 10-Q, Current Report on Form 8-K or
other report filed by the Company with the Commission, the Financial Industry Regulatory Authority (“FINRA”) or any securities exchange; and (iii) as soon as available, copies of any report or communication of the Company
mailed generally to holders of its capital stock or debt securities (including the holders of the Securities). 

(j) No Integration. The Company agrees that it will not and will cause its Affiliates not to make any offer or sale
of securities of the Company of any class if, as a result of the doctrine of “integration” referred to in Rule 502 under the Securities Act, such offer or sale would render invalid (for the purpose of (i) the sale of the Securities by
the Company to the Initial Purchasers, (ii) the resale of the Securities by the Initial Purchasers to Subsequent Purchasers or (iii) the resale of the Securities by such Subsequent Purchasers to others) the exemption from the registration
requirements of the Securities Act provided by Section 4(2) thereof or by Rule 144A or by Regulation S thereunder or otherwise. 
 (k) No General Solicitation or Directed Selling Efforts. The Company agrees that it will not and will not permit any of its Affiliates or any other person acting on its or their behalf (other than
the Initial Purchasers, as to which no covenant is given) to (i) solicit offers for, or offer or sell, the Securities by means of any form of general solicitation or general advertising within the meaning of Rule 502(c) of Regulation D or in
any manner involving a public offering within the meaning of Section 4(2) of the Securities Act or (ii) engage in any directed selling efforts with respect to the Securities within the meaning of Regulation S, and the Company will and will
cause all such persons to comply with the offering restrictions requirement of Regulation S with respect to the Securities. 
 (l) No Restricted Resales. During the period of one year after the Closing Date, the Company will not, and will not permit any of its affiliates (as defined in Rule 144 under the Securities Act) to
resell any of the Notes that constitute “restricted securities” under Rule 144 under the Securities Act that have been reacquired by any of them. 
 (m) Legended Securities. Each certificate for a Note will bear the legend contained in “Transfer Restrictions” in the Preliminary Offering Memorandum for the time period and upon the
other terms stated in the Preliminary Offering Memorandum. 
 The Representative, on behalf of the several Initial Purchasers,
may, in its sole discretion, waive in writing the performance by the Company or any Guarantor of any one or more of the foregoing covenants or extend the time for their performance. 

  
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 SECTION 4. Payment of Expenses. Each of the Company and the Guarantors, jointly and
severally, agrees to pay all costs, fees and expenses incurred in connection with the performance of its obligations under this Agreement, the Indenture and the Registration Rights Agreement, and in connection with the transactions contemplated
hereby and thereby, including, without limitation, (i) all expenses incident to the issuance and delivery of the Securities (including all printing and engraving costs), (ii) all necessary issue, transfer and other stamp taxes in
connection with the issuance and sale of the Securities to the Initial Purchasers, (iii) all fees and expenses of the Company’s and the Guarantors’ counsel, independent public or certified public accountants and other advisors,
(iv) all costs and expenses incurred in connection with the preparation, printing, filing, shipping and distribution of the Pricing Disclosure Package and the Final Offering Memorandum (including financial statements and exhibits), and all
amendments and supplements thereto, and the Transaction Documents, (v) all filing fees, attorneys’ fees and expenses incurred by the Company, the Guarantors or the Initial Purchasers in connection with qualifying or registering (or
obtaining exemptions from the qualification or registration of) all or any part of the Securities for offer and sale under the securities laws of the several states of the United States, the provinces of Canada or other jurisdictions designated by
the Initial Purchasers (including, without limitation, the cost of preparing, printing and mailing preliminary and final blue sky or legal investment memoranda and any related supplements to the Pricing Disclosure Package or the Final Offering
Memorandum, (vi) the fees and expenses of the Trustee, including the fees and disbursements of counsel for the Trustee in connection with the Indenture, the Securities and the Exchange Securities, (vii) any fees payable in connection with
the rating of the Securities or the Exchange Securities with the ratings agencies, (viii) any filing fees incident to, and any reasonable fees and disbursements of counsel to the Initial Purchasers in connection with the review by FINRA, if
any, of the terms of the sale of the Securities or the Exchange Securities, (ix) all fees and expenses (including reasonable fees and expenses of counsel) of the Company and the Guarantors in connection with approval of the Securities by the
Depositary for “book-entry” transfer, and the performance by the Company and the Guarantors of their respective other obligations under this Agreement and (x) all expenses incident to the “road show” for the offering of the
Securities, including the cost of any chartered airplane or other transportation. Except as provided in this Section 4 and Sections 6, 8 and 9 hereof, the Initial Purchasers shall pay their own expenses, including the fees and
disbursements of their counsel. 
 SECTION 5. Conditions of the Obligations of the Initial Purchasers. The obligations of
the several Initial Purchasers to purchase and pay for the Securities as provided herein on the Closing Date shall be subject to the accuracy of the representations and warranties on the part of the Company and the Guarantors set forth in
Section 1 hereof as of the date hereof and as of the Closing Date as though then made and to the timely performance by the Company and the Guarantors of their covenants and other obligations hereunder, and to each of the following additional
conditions: 
 (a) Accountants’ Comfort Letter. On the date hereof, the Initial Purchasers shall have
received from PricewaterhouseCoopers, the independent registered public accounting firm for the Company, a “comfort letter” dated the date hereof addressed to the Initial Purchasers, in form and substance satisfactory to the
Representative, covering the financial information in the Pricing Disclosure Package and other customary matters. In addition, on the Closing Date, the Initial Purchasers shall have received from such accountants a “bring-down comfort
letter” dated the Closing Date addressed to the Initial 

  
 22 









 
Purchasers, in form and substance satisfactory to the Representative, in the form of the “comfort letter” delivered on the date hereof, except that (i) it shall cover the financial
information in the Final Offering Memorandum and any amendment or supplement thereto and (ii) procedures shall be brought down to a date no more than 3 days prior to the Closing Date. 

(b) Independent Petroleum Consultants’ Letter. On the date hereof, the Representative shall have received from
Ryder Scott Company L.P., independent petroleum consultants with respect to the Company and its subsidiaries, a letter dated the date hereof addressed to the Initial Purchasers covering the reserve information included in or incorporated by
reference in the Pricing Disclosure Package and other customary information, the form of which is attached as Exhibit B. In addition, on the Closing Date, the Initial Purchasers shall have received from such independent petroleum
consultants a “bring-down letter” dated the Closing Date addressed to the Initial Purchasers, in form and substance satisfactory to the Representative, to the effect that they reaffirm the statements made in the letter furnished by them
pursuant to the immediately preceding sentence, except that it shall cover the reserve information included or incorporated by reference in the Final Offering Memorandum and any amendment or supplement thereto. 

(c) No Material Adverse Change or Ratings Agency Change. For the period from and after the date of this Agreement
and prior to the Closing Date: 
 (i) in the judgment of the Representative there shall not have occurred any
Material Adverse Change; and 
 (ii) there shall not have occurred any downgrading, nor shall any notice have
been given of any intended or potential downgrading or of any review for a possible change that does not indicate the direction of the possible change, in the rating accorded the Company or any of its subsidiaries or any of their securities or
indebtedness by any “nationally recognized statistical rating organization” as such term is defined for purposes of Rule 436 under the Securities Act. 
 (d) Opinion of Counsel for the Company. On the Closing Date the Initial Purchasers shall have received the favorable opinion of Conner & Winters, LLP, outside counsel for the Company,
dated as of such Closing Date, the form of which is attached as Exhibit C. 
 (e) Opinion of
General Counsel for the Company. On the Closing Date, the Initial Purchasers shall have received the favorable opinion of Mark E. Schell, General Counsel for the Company, dated as of such Closing Date, the form of which is attached as
Exhibit D. 
 (f) Opinion of Counsel for the Initial Purchasers. On the Closing Date the
Initial Purchasers shall have received the favorable opinion of Davis Polk & Wardwell LLP, counsel for the Initial Purchasers, dated as of such Closing Date, with respect to such matters as may be reasonably requested by the Initial
Purchasers. 

  
 23 









 (g) Officers’ Certificate. On the Closing Date the Initial
Purchasers shall have received a written certificate executed by the Chairman of the Board, Chief Executive Officer or President of the Company and each Guarantor and the Chief Financial Officer or Chief Accounting Officer of the Company and each
Guarantor, dated as of the Closing Date, to the effect set forth in Section 5(c)(ii) hereof, and further to the effect that: 
 (i) for the period from and after the date of this Agreement and prior to the Closing Date there has not occurred any Material Adverse Change; 

(ii) the representations, warranties and covenants of the Company and the Guarantors, set forth in Section 1 hereof
were true and correct as of the date hereof and are true and correct as of the Closing Date with the same force and effect as though expressly made on and as of the Closing Date; and 

(iii) each of the Company and the Guarantors has complied with all the agreements hereunder and satisfied all the
conditions on its part to be performed or satisfied hereunder at or prior to the Closing Date. 
 (h)
Indenture; Registration Rights Agreement. The Company and the Guarantors shall have executed and delivered the Indenture, in form and substance reasonably satisfactory to the Initial Purchasers, and the Initial Purchasers shall have
received executed copies thereof. The Company and the Guarantors shall have executed and delivered the Registration Rights Agreement, in form and substance reasonably satisfactory to the Initial Purchasers, and the Initial Purchasers shall have
received such executed counterparts. 
 (i) Credit Facility Consent. On the Closing Date, the Credit
Facility Consent shall be in full force and effect. 
 (j) Additional Documents. On or before the Closing
Date, the Initial Purchasers and counsel for the Initial Purchasers shall have received such information, documents and opinions as they may reasonably require for the purposes of enabling them to pass upon the issuance and sale of the Securities as
contemplated herein, or in order to evidence the accuracy of any of the representations and warranties, or the satisfaction of any of the conditions or agreements, herein contained. 

If any condition specified in this Section 5 is not satisfied when and as required to be satisfied, this Agreement may be terminated
by the Representative by notice to the Company at any time on or prior to the Closing Date, which termination shall be without liability on the part of 

  
 24 









 
any party to any other party, except that Sections 4, 6, 8 and 9 hereof shall at all times be effective and shall survive such termination. 

SECTION 6. Reimbursement of Initial Purchasers’ Expenses. If this Agreement is terminated by the Representative pursuant to
Section 5 or 10 hereof, including if the sale to the Initial Purchasers of the Securities on the Closing Date is not consummated because of any refusal, inability or failure on the part of either of the Company or any Guarantor to perform any
agreement herein or to comply with any provision hereof, the Company agrees to reimburse the Initial Purchasers but not any defaulting Initial Purchasers under Section 17 in the case that this Agreement is terminated pursuant to
Section 17, severally, upon demand for all out-of-pocket expenses that shall have been reasonably incurred by the Initial Purchasers in connection with the proposed purchase and the offering and sale of the Securities, including, without
limitation, fees and disbursements of counsel, printing expenses, travel expenses, postage, facsimile and telephone charges. 

SECTION 7. Offer, Sale and Resale Procedures. Each of the Initial Purchasers, on the one hand, and Each of the Company and the
Guarantors, on the other hand, hereby agree to observe the following procedures in connection with the offer and sale of the Securities: 
 (a) Offers and sales of the Securities will be made only by the Initial Purchasers or Affiliates thereof qualified to do so in the jurisdictions in which such offers or sales are made. Each such offer or
sale shall only be made to persons whom the offeror or seller reasonably believes to be Qualified Institutional Buyers or non-U.S. persons outside the United States to whom the offeror or seller reasonably believes offers and sales of the Securities
may be made in reliance upon Regulation S upon the terms and conditions set forth in Annex I hereto, which Annex I is hereby expressly made a part hereof. 
 (b) The Securities will be offered by approaching prospective Subsequent Purchasers on an individual basis. No general solicitation or general advertising (within the meaning of Rule 502 under the
Securities Act) will be used in the United States in connection with the offering of the Securities. 
 (c) Upon
original issuance by the Company, and until such time as the same is no longer required under the applicable requirements of the Securities Act, the Notes (and all securities issued in exchange therefor or in substitution thereof, other than the
Exchange Notes) shall bear the following legend: 
 THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE “SECURITIES ACT”), OR THE SECURITIES LAWS OF ANY STATE OR OTHER JURISDICTION. NEITHER THIS SECURITY NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR OTHERWISE
DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, SUCH REGISTRATION. THE HOLDER OF THIS SECURITY, BY ITS ACCEPTANCE HEREOF, 

  
 25 









 
AGREES ON ITS OWN BEHALF AND ON BEHALF OF ANY INVESTOR ACCOUNT FOR WHICH IT HAS PURCHASED SECURITIES, TO OFFER, SELL OR OTHERWISE TRANSFER SUCH SECURITY, BEFORE THE DATE (THE “RESALE
RESTRICTION TERMINATION DATE”) THAT IS [IN THE CASE OF RULE 144A NOTES: ONE YEAR] [IN THE CASE OF REGULATION S NOTES: 40 DAYS] AFTER THE LATER OF THE ORIGINAL ISSUE DATE HEREOF AND THE LAST DATE ON WHICH THE COMPANY OR ANY AFFILIATE OF
THE COMPANY WAS THE OWNER OF THIS SECURITY (OR ANY PREDECESSOR OF SUCH SECURITY), ONLY (A) TO THE COMPANY OR ITS SUBSIDIARIES, (B) UNDER A REGISTRATION STATEMENT THAT HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT, (C) FOR SO
LONG AS THE SECURITIES ARE ELIGIBLE FOR RESALE UNDER RULE 144A UNDER THE SECURITIES ACT, TO A PERSON IT REASONABLY BELIEVES IS A “QUALIFIED INSTITUTIONAL BUYER” AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT THAT PURCHASES FOR ITS OWN
ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO WHOM NOTICE IS GIVEN THAT THE TRANSFER IS BEING MADE IN RELIANCE ON RULE 144A, (D) UNDER OFFERS AND SALES THAT OCCUR OUTSIDE THE UNITED STATES WITHIN THE MEANING OF REGULATION S
UNDER THE SECURITIES ACT, (E) TO AN INSTITUTIONAL “ACCREDITED INVESTOR” WITHIN THE MEANING OF RULE 501(a)(1), (2), (3) OR (7) UNDER THE SECURITIES ACT THAT IS AN INSTITUTIONAL ACCREDITED INVESTOR ACQUIRING THE SECURITY FOR
ITS OWN ACCOUNT OR FOR THE ACCOUNT OF SUCH AN INSTITUTIONAL ACCREDITED INVESTOR, IN EACH CASE IN A MINIMUM PRINCIPAL AMOUNT OF THE SECURITIES OF $250,000, FOR INVESTMENT PURPOSES AND NOT WITH A VIEW TO OR FOR OFFER OR SALE IN CONNECTION WITH ANY
DISTRIBUTION IN VIOLATION OF THE SECURITIES ACT, OR (F) UNDER ANOTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT, SUBJECT TO THE COMPANY’S AND THE TRUSTEE’S RIGHT BEFORE ANY SUCH OFFER, SALE OR
TRANSFER UNDER CLAUSES (C), (D), (E) OR (F) TO REQUIRE THE DELIVERY OF AN OPINION OF COUNSEL, CERTIFICATION AND/OR OTHER INFORMATION SATISFACTORY TO EACH OF THEM. THIS LEGEND WILL BE REMOVED ON THE REQUEST OF THE HOLDER AFTER THE RESALE
RESTRICTION TERMINATION DATE. 
 Following the sale of the Securities by the Initial Purchasers to Subsequent Purchasers
pursuant to the terms hereof, the Initial Purchasers shall not be liable or responsible to the Company or the Guarantors for any losses, damages or liabilities suffered or incurred by the
Compa-

  
 26 









 
ny or the Guarantors including any losses, damages or liabilities under the Securities Act, arising from or relating to any resale or transfer of any Security. 

SECTION 8. Indemnification. 
 (a) Indemnification of the Initial Purchasers. Each of the Company and the Guarantors, jointly and severally, agrees to indemnify and hold harmless each Initial Purchaser, its affiliates,
directors, officers and employees, and each person, if any, who controls any Initial Purchaser within the meaning of the Securities Act and the Exchange Act against any loss, claim, damage, liability or expense, as incurred, to which such Initial
Purchaser, affiliate, director, officer, employee or controlling person may become subject, under the Securities Act, the Exchange Act or other federal or state statutory law or regulation, or at common law or otherwise (including in settlement of
any litigation, if such settlement is effected with the written consent of the Company), insofar as such loss, claim, damage, liability or expense (or actions in respect thereof as contemplated below) arises out of or is based: (i) upon any
untrue statement or alleged untrue statement of a material fact contained in the Preliminary Offering Memorandum, the Pricing Supplement, any Company Additional Written Communication or the Final Offering Memorandum (or any amendment or supplement
thereto), or the omission or alleged omission therefrom of a material fact, in each case, necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; or (ii) in whole or in
part upon any inaccuracy in the representations and warranties of the Company or the Guarantors contained herein; or (iii) in whole or in part upon any failure of the Company or the Guarantors to perform their respective obligations hereunder
or under law; or (iv) any act or failure to act or any alleged act or failure to act by any Initial Purchaser in connection with, or relating in any manner to, the offering contemplated hereby, and which is included as part of or referred to in
any loss, claim, damage, liability or action arising out of or based upon any matter covered by clause (i) above, provided that the Company and the Guarantors shall not be liable under this clause (iv) to the extent that a court of
competent jurisdiction shall have determined by a final judgment that such loss, claim, damage, liability or action resulted directly from any such acts or failures to act undertaken or omitted to be taken by such Initial Purchaser through its gross
negligence or willful misconduct; and to reimburse each Initial Purchaser and each such affiliate, director, officer, employee or controlling person for any and all expenses (including the fees and disbursements of counsel chosen by Merrill Lynch)
as such expenses are reasonably incurred by such Initial Purchaser or such affiliate, director, officer, employee or controlling person in connection with investigating, defending, settling, compromising or paying any such loss, claim, damage,
liability, expense or action; provided, however, that the foregoing indemnity agreement shall not apply, with respect to an Initial Purchaser, to any loss, claim, damage, liability or expense to the extent, but only to the extent, arising out of or
based upon any untrue statement or alleged untrue statement or omission or alleged omission made in reliance upon and in conformity with written information furnished to the Company by the Representative expressly for use in the Preliminary Offering
Memorandum, the Pricing Supplement, any Company Additional Written Communication or the Final Offering Memorandum (or any amendment or supplement thereto). The indemnity agreement set forth in this Section 8(a) shall be in addition to any
liabilities that the Company or the Guarantors may otherwise have. 
 (b) Indemnification of the Company and the
Guarantors. Each Initial Purchaser agrees, severally and not jointly, to indemnify and hold harmless each of the Company and the 

  
 27 









 
Guarantors and their respective directors and officers and each person, if any, who controls the Company or any Guarantor within the meaning of the Securities Act or the Exchange Act, against any
loss, claim, damage, liability or expense, as incurred, to which the Company, any Guarantor or any such director, officer or controlling person may become subject, under the Securities Act, the Exchange Act, or other federal or state statutory law
or regulation, or at common law or otherwise (including in settlement of any litigation, if such settlement is effected with the written consent of such Initial Purchaser), insofar as such loss, claim, damage, liability or expense (or actions in
respect thereof as contemplated below) arises out of or is based upon any untrue statement or alleged untrue statement of a material fact contained in the Preliminary Offering Memorandum, the Pricing Supplement, any Company Additional Written
Communication or the Final Offering Memorandum (or any amendment or supplement thereto), or the omission or alleged omission therefrom of a material fact necessary in order to make the statements therein, in the light of the circumstances under
which they were made, not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in the Preliminary Offering Memorandum, the Pricing Supplement,
any Company Additional Written Communication or the Final Offering Memorandum (or any amendment or supplement thereto), in reliance upon and in conformity with written information furnished to the Company by any Initial Purchaser through the
Representative expressly for use therein; and to reimburse the Company, the Guarantors and each such director, officer or controlling person for any and all expenses (including the fees and disbursements of counsel) as such expenses are reasonably
incurred by the Company, any Guarantor or such director, officer or controlling person in connection with investigating, defending, settling, compromising or paying any such loss, claim, damage, liability, expense or action. Each of the Company and
the Guarantors hereby acknowledges that the only information that the Initial Purchasers through the Representative have furnished to the Company expressly for use in the Preliminary Offering Memorandum, the Pricing Supplement, any Company
Additional Written Communication or the Final Offering Memorandum (or any amendment or supplement thereto) are the statements set forth in the second and third sentences of the seventh paragraph and the tenth and eleventh paragraphs under the
caption “Plan of Distribution” in the Preliminary Offering Memorandum and the Final Offering Memorandum. The indemnity agreement set forth in this Section 8(b) shall be in addition to any liabilities that each Initial Purchaser may
otherwise have. 
 (c) Notifications and Other Indemnification Procedures. Promptly after receipt by an indemnified party
under this Section 8 of notice of the commencement of any action, such indemnified party will, if a claim in respect thereof is to be made against an indemnifying party under this Section 8, notify the indemnifying party in writing of the
commencement thereof; provided that the failure to so notify the indemnifying party will not relieve it from any liability which it may have to any indemnified party under this Section 8 except to the extent that it has been materially
prejudiced by such failure (through the forfeiture of substantive rights and defenses) and shall not relieve the indemnifying party from any liability that the indemnifying party may have to an indemnified party other than under this Section 8.
In case any such action is brought against any indemnified party and such indemnified party seeks or intends to seek indemnity from an indemnifying party, the indemnifying party will be entitled to participate in and, to the extent that it shall
elect, jointly with all other indemnifying parties similarly notified, by written notice delivered to the indemnified party promptly after receiving the aforesaid notice from such indemnified party, to assume the defense thereof with counsel
reasonably satisfactory to such indemnified party; provided, however, if the defendants in any such action include both 

  
 28 









 
the indemnified party and the indemnifying party and the indemnified party shall have reasonably concluded that a conflict may arise between the positions of the indemnifying party and the
indemnified party in conducting the defense of any such action or that there may be legal defenses available to it and/or other indemnified parties which are different from or additional to those available to the indemnifying party, the indemnified
party or parties shall have the right to select separate counsel to assume such legal defenses and to otherwise participate in the defense of such action on behalf of such indemnified party or parties. Upon receipt of notice from the indemnifying
party to such indemnified party of such indemnifying party’s election so to assume the defense of such action and approval by the indemnified party of counsel, the indemnifying party will not be liable to such indemnified party under this
Section 8 for any legal or other expenses subsequently incurred by such indemnified party in connection with the defense thereof unless (i) the indemnified party shall have employed separate counsel in accordance with the proviso to the
immediately preceding sentence (it being understood, however, that the indemnifying party shall not be liable for the expenses of more than one separate counsel (other than local counsel), reasonably approved by the indemnifying party or by Merrill
Lynch (in the case of counsel representing the Initial Purchasers or their related persons), representing the indemnified parties who are parties to such action) or (ii) the indemnifying party shall not have employed counsel satisfactory to the
indemnified party to represent the indemnified party within a reasonable time after notice of commencement of the action, in each of which cases the fees and expenses of counsel shall be at the expense of the indemnifying party. 

(d) Settlements. The indemnifying party under this Section 8 shall not be liable for any settlement of any proceeding
effected without its written consent, which will not be unreasonably withheld, but if settled with such consent or if there be a final judgment for the plaintiff, the indemnifying party agrees to indemnify the indemnified party against any loss,
claim, damage, liability or expense by reason of such settlement or judgment. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement, compromise or consent to the entry of judgment in any
pending or threatened action, suit or proceeding in respect of which any indemnified party is or could have been a party and indemnity was or could have been sought hereunder by such indemnified party, unless such settlement, compromise or consent
(i) includes an unconditional release of such indemnified party from all liability on claims that are the subject matter of such action, suit or proceeding and (ii) does not include any statements as to or any findings of fault,
culpability or failure to act by or on behalf of any indemnified party. 
 SECTION 9. Contribution. If the
indemnification provided for in Section 8 hereof is for any reason held to be unavailable to or otherwise insufficient to hold harmless an indemnified party in respect of any losses, claims, damages, liabilities or expenses referred to therein,
then each indemnifying party shall contribute to the aggregate amount paid or payable by such indemnified party, as incurred, as a result of any losses, claims, damages, liabilities or expenses referred to therein (i) in such proportion as is
appropriate to reflect the relative benefits received by the Company and the Guarantors, on the one hand, and the Initial Purchasers, on the other hand, from the offering of the Securities pursuant to this Agreement or (ii) if the allocation
provided by clause (i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company and the Guarantors,
on the one hand, and the Initial Purchasers, on the other hand, in connection with the statements or omissions or inaccuracies in the representations and warran-

  
 29 









 
ties herein which resulted in such losses, claims, damages, liabilities or expenses, as well as any other relevant equitable considerations. The relative benefits received by the Company and the
Guarantors, on the one hand, and the Initial Purchasers, on the other hand, in connection with the offering of the Securities pursuant to this Agreement shall be deemed to be in the same respective proportions as the total net proceeds from the
offering of the Securities pursuant to this Agreement (before deducting expenses) received by the Company, and the total discount received by the Initial Purchasers bear to the aggregate initial offering price of the Securities. The relative fault
of the Company and the Guarantors, on the one hand, and the Initial Purchasers, on the other hand, shall be determined by reference to, among other things, whether any such untrue or alleged untrue statement of a material fact or omission or alleged
omission to state a material fact or any such inaccurate or alleged inaccurate representation or warranty relates to information supplied by the Company and the Guarantors,, on the one hand, or the Initial Purchasers, on the other hand, and the
parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission or inaccuracy. 
 The amount paid or payable by a party as a result of the losses, claims, damages, liabilities and expenses referred to above shall be deemed to include, subject to the limitations set forth in
Section 8 hereof, any legal or other fees or expenses reasonably incurred by such party in connection with investigating or defending any action or claim. The provisions set forth in Section 8 hereof with respect to notice of commencement
of any action shall apply if a claim for contribution is to be made under this Section 9; provided, however, that no additional notice shall be required with respect to any action for which notice has been given under Section 8 hereof for
purposes of indemnification. 
 The Company, the Guarantors and the Initial Purchasers agree that it would not be just and
equitable if contribution pursuant to this Section 9 were determined by pro rata allocation (even if the Initial Purchasers were treated as one entity for such purpose) or by any other method of allocation which does not take account of the
equitable considerations referred to in this Section 9. 
 Notwithstanding the provisions of this Section 9, no
Initial Purchaser shall be required to contribute any amount in excess of the discount received by such Initial Purchaser in connection with the Securities distributed by it. No person guilty of fraudulent misrepresentation (within the meaning of
Section 11 of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Initial Purchasers’ obligations to contribute pursuant to this Section 9 are several, and
not joint, in proportion to their respective commitments as set forth opposite their names in Schedule A. For purposes of this Section 9, each director, officer and employee of an Initial Purchaser and each person, if any, who controls an
Initial Purchaser within the meaning of the Securities Act and the Exchange Act shall have the same rights to contribution as such Initial Purchaser, and each director of the Company or any Guarantor, each officer of the Company and each person, if
any, who controls the Company or any Guarantor within the meaning of the Securities Act and the Exchange Act shall have the same rights to contribution as the Company and the Guarantors. 

SECTION 10. Termination of this Agreement. Prior to the Closing Date, this Agreement may be terminated by the Representative by
notice given to the Company if at any time: (i) trading or quotation in any of the Company’s securities shall have been suspended or limited by 

  
 30 









 
the Commission or trading in securities generally on the NYSE shall have been suspended or limited, or minimum or maximum prices shall have been generally established on such stock exchange by
the Commission or FINRA; (ii) a general banking moratorium shall have been declared by any of federal or New York authorities; (iii) there shall have occurred any outbreak or escalation of national or international hostilities or any
crisis or calamity, or any change in the United States or international financial markets, or any substantial change or development involving a prospective substantial change in United States’ or international political, financial or economic
conditions, as in the judgment of the Representative is material and adverse and makes it impracticable or inadvisable to proceed with the offering sale or delivery of the Securities in the manner and on the terms described in the Pricing Disclosure
Package or to enforce contracts for the sale of securities; or (iv) in the judgment of the Representative there shall have occurred any Material Adverse Change. Any termination pursuant to this Section 10 shall be without liability on the
part of (i) the Company or any Guarantor to any Initial Purchaser, except that the Company and the Guarantors shall be obligated to reimburse the expenses of the Initial Purchasers pursuant to Sections 4 and 6 hereof, (ii) any Initial
Purchaser to the Company or the Guarantors or (iii) any party hereto to any other party except that the provisions of Sections 8 and 9 hereof shall at all times be effective and shall survive such termination. 

SECTION 11. Representations and Indemnities to Survive Delivery. The respective indemnities, agreements, representations,
warranties and other statements of the Company, the Guarantors, their respective officers and the several Initial Purchasers set forth in or made pursuant to this Agreement will remain in full force and effect, regardless of any investigation made
by or on behalf of any Initial Purchaser, the Company, any Guarantor or any of their partners, officers or directors or any controlling person, as the case may be, and will survive delivery of and payment for the Securities sold hereunder and any
termination of this Agreement. 
 SECTION 12. Notices. All communications hereunder shall be in writing and shall be
mailed, hand delivered, couriered or facsimiled and confirmed to the parties hereto as follows: 
 If to the Initial Purchasers:

 Merrill Lynch, Pierce, Fenner & Smith Incorporated 

One Bryant Park 

New York, New York 10036 
 Facsimile: (212) 901-7897 
 Attention: Legal Department 

with a copy to: 

Davis Polk & Wardwell LLP 
 450 Lexington Avenue 
 New York, New York 10017 

Facsimile: (212) 701-5800 
 Attention: Richard D. Truesdell, Jr. 
 If to the Company or the Guarantors:


  
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 Unit Corporation 
 7130 South Lewis 
 Suite 1000 

Tulsa, OK 74136 

Facsimile: (918) 493-7711 
 Attention: David Merrill, Chief Financial Officer and Treasurer, with a copy to Mark Schell, Senior Vice President, General Counsel and Secretary 

Any party hereto may change the address or facsimile number for receipt of communications by giving written notice to the others.

 SECTION 13. Successors. This Agreement will inure to the benefit of and be binding upon the parties hereto, and to the
benefit of the indemnified parties referred to in Sections 8 and 9 hereof, and in each case their respective successors, and no other person will have any right or obligation hereunder. The term “successors” shall not include any
Subsequent Purchaser or other purchaser of the Securities as such from any of the Initial Purchasers merely by reason of such purchase. 
 SECTION 14. Authority of the Representatives. Any action by the Initial Purchasers hereunder may be taken by Merrill Lynch on behalf of the Initial Purchasers, and any such action taken by Merrill
Lynch shall be binding upon the Initial Purchasers. 
 SECTION 15. Partial Unenforceability. The invalidity or
unenforceability of any section, paragraph or provision of this Agreement shall not affect the validity or enforceability of any other section, paragraph or provision hereof. If any section, paragraph or provision of this Agreement is for any reason
determined to be invalid or unenforceable, there shall be deemed to be made such minor changes (and only such minor changes) as are necessary to make it valid and enforceable. 
 SECTION 16. Governing Law Provisions. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF NEW YORK APPLICABLE TO AGREEMENTS MADE AND TO BE
PERFORMED IN SUCH STATE WITHOUT REGARD TO CONFLICTS OF LAW PRINCIPLES THEREOF. 
 (a) Consent to Jurisdiction. Any legal
suit, action or proceeding arising out of or based upon this Agreement or the transactions contemplated hereby (“Related Proceedings”) may be instituted in the federal courts of the United States of America located in the City and
County of New York or the courts of the State of New York in each case located in the City and County of New York (collectively, the “Specified Courts”), and each party irrevocably submits to the exclusive jurisdiction (except for
suits, actions, or proceedings instituted in regard to the enforcement of a judgment of any Specified Court in a Related Proceeding, as to which such jurisdiction is non-exclusive) of the Specified Courts in any Related Proceeding. Service of any
process, summons, notice or document by mail to such party’s address set forth above shall be effective service of process for any Related Proceeding brought in any Specified Court. The parties irrevocably and unconditionally waive any
objection to the laying of venue of any Specified Proceeding in the Specified Courts and irrevocably and unconditionally waive and agree not to 

  
 32 









 
plead or claim in any Specified Court that any Related Proceeding brought in any Specified Court has been brought in an inconvenient forum. 

SECTION 17. Default of One or More of the Several Initial Purchasers. If any one or more of the several Initial Purchasers shall
fail or refuse to purchase Securities that it or they have agreed to purchase hereunder on the Closing Date, and the aggregate number of Securities which such defaulting Initial Purchaser or Initial Purchasers agreed but failed or refused to
purchase does not exceed 10% of the aggregate number of the Securities to be purchased on such date, the other Initial Purchasers shall be obligated, severally, in the proportions that the number of Securities set forth opposite their respective
names on Schedule A bears to the aggregate number of Securities set forth opposite the names of all such non-defaulting Initial Purchasers, or in such other proportions as may be specified by the Initial Purchasers with the consent of the
non-defaulting Initial Purchasers, to purchase the Securities which such defaulting Initial Purchaser or Initial Purchasers agreed but failed or refused to purchase on the Closing Date. If any one or more of the Initial Purchasers shall fail or
refuse to purchase Securities and the aggregate number of Securities with respect to which such default occurs exceeds 10% of the aggregate number of Securities to be purchased on the Closing Date, and arrangements satisfactory to the Initial
Purchasers and the Company for the purchase of such Securities are not made within 48 hours after such default, this Agreement shall terminate without liability of any party to any other party except that the provisions of Sections 4, 6, 8 and
9 hereof shall at all times be effective and shall survive such termination. In any such case either the Initial Purchasers or the Company shall have the right to postpone the Closing Date, as the case may be, but in no event for longer than seven
days in order that the required changes, if any, to the Final Offering Memorandum or any other documents or arrangements may be effected. 
 As used in this Agreement, the term “Initial Purchaser” shall be deemed to include any person substituted for a defaulting Initial Purchaser under this Section 17. Any action taken
under this Section 17 shall not relieve any defaulting Initial Purchaser from liability in respect of any default of such Initial Purchaser under this Agreement. 
 SECTION 18. No Advisory or Fiduciary Responsibility. Each of the Company and the Guarantors acknowledges and agrees that: (i) the purchase and sale of the Securities pursuant to this
Agreement, including the determination of the offering price of the Securities and any related discounts and commissions, is an arm’s-length commercial transaction between the Company and the Guarantors, on the one hand, and the several Initial
Purchasers, on the other hand, and the Company and the Guarantors are capable of evaluating and understanding and understand and accept the terms, risks and conditions of the transactions contemplated by this Agreement; (ii) in connection with
each transaction contemplated hereby and the process leading to such transaction each Initial Purchaser is and has been acting solely as a principal and is not the agent or fiduciary of the Company and the Guarantors or their respective affiliates,
stockholders, creditors or employees or any other party; (iii) no Initial Purchaser has assumed or will assume an advisory or fiduciary responsibility in favor of the Company and the Guarantors with respect to any of the transactions
contemplated hereby or the process leading thereto (irrespective of whether such Initial Purchaser has advised or is currently advising the Company and the Guarantors on other matters) or any other obligation to the Company and the Guarantors except
the obligations expressly set forth in this Agreement; (iv) the several Initial Purchasers and their respective affiliates may be engaged in a broad range of transactions that involve interests that
dif-

  
 33 









 
fer from those of the Company and the Guarantors, and the several Initial Purchasers have no obligation to disclose any of such interests by virtue of any fiduciary or advisory relationship; and
(v) the Initial Purchasers have not provided any legal, accounting, regulatory or tax advice with respect to the offering contemplated hereby, and the Company and the Guarantors have consulted their own legal, accounting, regulatory and tax
advisors to the extent they deemed appropriate. 
 This Agreement supersedes all prior agreements and understandings (whether
written or oral) between the Company, the Guarantors and the several Initial Purchasers, or any of them, with respect to the subject matter hereof. The Company and the Guarantors hereby waive and release, to the fullest extent permitted by law, any
claims that the Company and the Guarantors may have against the several Initial Purchasers with respect to any breach or alleged breach of fiduciary duty. 
 SECTION 19. General Provisions. This Agreement constitutes the entire agreement of the parties to this Agreement and supersedes all prior written or oral and all contemporaneous oral agreements,
understandings and negotiations with respect to the subject matter hereof. This Agreement may be executed in two or more counterparts, each one of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the
same instrument. Delivery of an executed counterpart of a signature page to this Agreement by telecopier, facsimile or other electronic transmission (i.e., a “pdf” or “tif”) shall be effective as delivery of a manually executed
counterpart thereof. This Agreement may not be amended or modified unless in writing by all of the parties hereto, and no condition herein (express or implied) may be waived unless waived in writing by each party whom the condition is meant to
benefit. The section headings herein are for the convenience of the parties only and shall not affect the construction or interpretation of this Agreement. 

  
 34 









 If the foregoing is in accordance with your understanding of our agreement, kindly sign and
return to the Company the enclosed copies hereof, whereupon this instrument, along with all counterparts hereof, shall become a binding agreement in accordance with its terms. 
 Very truly yours, 
  

			
	UNIT CORPORATION
		
	By:	 	    /s/ Mark E. Schell
		 	Name:   Mark E. Schell
		 	Title:     Senior Vice President


  

			
	 THE “GUARANTORS”:
  

UNIT DRILLING COMPANY
 UNIT PETROLEUM
COMPANY
 UNIT TEXAS COMPANY
 UNIT
DRILLING AND EXPLORATION
     COMPANY
 PETROLEUM SUPPLY COMPANY

		
	By:	 	    /s/ Mark E. Schell
		 	Name:   Mark E. Schell
		 	Title:     Senior Vice President


  

			
	 UNIT DRILLING USA COLOMBIA, L.L.C.
 UNIT DRILLING COLOMBIA, L.L.C.
 UNIT TEXAS DRILLING, L.L.C.

PRESTON COUNTY GAS GATHERING, L.L.C.
 SUPERIOR
PIPELINE COMPANY, L.L.C.
 SUPERIOR PIPELINE TEXAS, L.L.C.
 SUPERIOR APPALACHIAN PIPELINE, L.L.C.

		
	By:	 	    /s/ Mark E. Schell
		 	Name:   Mark E. Schell
		 	Title:     Manager


 [Signature page to the Purchase Agreement] 







 The foregoing Purchase Agreement is hereby confirmed and accepted by the Initial Purchasers
as of the date first above written. 
  

					
	 MERRILL LYNCH, PIERCE, FENNER &
SMITH
 INCORPORATED

		
		 	 Acting on behalf of itself
 and as the Representative of
 the several Initial Purchasers

			
	By:	 		 	 Merrill Lynch, Pierce, Fenner & Smith
 Incorporated

			
		 	By:	 	 /s/ Adam Cady

		 		 	Adam Cady, Managing Director

 [Signature page to the Purchase Agreement] 







 SCHEDULE A 

 

					
	 Initial Purchasers
	  	Aggregate Principal
Amount 
of
Securities to be
Purchased	 
	 Merrill Lynch, Pierce, Fenner & Smith Incorporated
	  	$	160,000,000	  
	 BMO Capital Markets Corp.
	  	 	100,000,000	  
	 Banco Bilbao Vizcaya Arentaria, S.A.
	  	 	27,000,000	  
	 Bosc, Inc.
	  	 	27,000,000	  
	 Comerica Securities, Inc.
	  	 	24,000,000	  
	 Credit Agricole Securities (USA) Inc.
	  	 	24,000,000	  
	 Wells Fargo Securities, LLC
	  	 	24,000,000	  
	 CIBC World Markets Corp.
	  	 	14,000,000	  
	 Total
	  	$	400,000,000	  








 EXHIBIT A 

 

			
	PRICING SUPPLEMENT	 	CONFIDENTIAL

 US$400,000,000 
 UNIT CORPORATION 
 6 5/8% Senior Subordinated Notes due 2021 

July 12, 2012 
  

 
 This Pricing Supplement is qualified in its
entirety by reference to the Preliminary Offering Memorandum dated July 12, 2012. The information in this Pricing Supplement supplements the Preliminary Offering Memorandum and supersedes the information in the Preliminary Offering Memorandum
to the extent inconsistent with the information in the Preliminary Offering Memorandum. Capitalized terms used but not defined in this Pricing Supplement have the respective meanings ascribed to them in the Preliminary Offering Memorandum.

 Terms Applicable to the 6 5/8% Senior Subordinated Notes due 2021 

 

	 Issuer: 
	Unit Corporation (the “Company”) 

  

	 Guarantees: 
	Each of the Company’s existing and future domestic restricted subsidiaries will jointly and severally, fully and unconditionally, guarantee, on a senior subordinated basis, the
Company’s obligations under the Notes and all obligations under the Indenture. 

  

	 Principal Amount: 
	$400,000,000 

  

	 Gross Proceeds: 
	$395,000,000 

  

	 Use of Proceeds 
	To partially fund the acquisition of certain oil and gas assets in western Oklahoma and the Texas Panhandle and to pay related costs and expenses. Any remaining proceeds will be used for general
corporate purposes. 

  

	 Title of Securities: 
	6 5/8% Senior Subordinated Notes due 2021 (the “Notes”) 

  

	 Final Maturity Date: 
	May 15, 2021 

  

	 Benchmark: 
	3.625% UST due 2/15/21 

  

	 Price to Public: 
	98.750%, plus accrued interest from May 15, 2012 

  

	 Coupon: 
	6.625% 

  

	 Yield to Maturity: 
	6.814% 

  

	 Interest Payment Dates: 
	Semi-annually in arrears on each May 15 and November 15, beginning on November 15, 2012 


 

	 Record Dates: 
	Each May 1 and November 1 immediately preceding the related interest payment dates 


  
 A-1









 This Pricing Supplement is qualified in its entirety by reference to the Preliminary
Offering Memorandum dated July 12, 2012 
  
  

	 Optional Redemption: 
	On and after May 15, 2016, the Company may redeem all or, from time to time, a part of the Notes, at the following redemption prices (expressed as a percentage of principal amount) plus
accrued and unpaid interest on the Notes, if any, to the redemption date, if redeemed during the twelve-month period beginning on May 15 of the years indicated below: 


 

									
	 	 	 Year
	  	 Percentage
	 	 	 
	 	 2016
	  	 	103.313	% 	 
	 	 2017
	  	 	102.208	% 	 
	 	 2018
	  	 	101.104	% 	 
	 	 2019 and thereafter
	  	 	100.000	% 	 

  

	 	In addition, at any time before May 15, 2016, the Company may redeem the Notes, in whole or in part, at a redemption price equal to 100% of the principal amount
thereof plus the Applicable Premium plus accrued and unpaid interest, if any, to the redemption date. 

  

	 Optional Redemption with Equity Proceeds: 
	Up to 35% at 106.625% prior to May 15, 2014 

  

	 Correction to the Special Mandatory Redemption: 
	The terms of the special mandatory redemption have been corrected from those set forth in the Preliminary Offering Memorandum dated July 12, 2012. The corrected terms will be:


  

	 	If the Acquisition is not consummated on or before November 30, 2012 or if, before that date, the Acquisition Agreement is terminated, the Company must redeem all
of the Notes on the Special Mandatory Redemption Date at a redemption price equal to (x) if the Special Mandatory Redemption Date occurs on or before September 30, 2012, 98.750% of the aggregate principal amount of the Notes being redeemed
or (y) if the Special Mandatory Redemption Date occurs after September 30, 2012, 99.750% of the aggregate principal amount of the Notes being redeemed, in each case, plus accrued and unpaid interest to, but excluding, the Special Mandatory
Redemption Date. The “Special Mandatory Redemption Date” means the earlier to occur of (1) December 7, 2012 or (2) the 5th business day following the termination of the Acquisition Agreement for any reason.


  

	 Change of Control: 
	Put at 101% of the principal amount of the Notes plus accrued and unpaid interest 

  

	 Joint Book-Running Managers: 
	Merrill Lynch, Pierce, Fenner & Smith 


	 	                      Incorporated 


	 	BMO Capital Markets Corp. 

  

	 Co-Managers: 
	Banco Bilbao Vizcaya Argentaria, S.A. 


	 	Bosc, Inc. 


	 	Comerica Securities, Inc. 


	 	Credit Agricole Securities (USA) Inc. 


	 	Wells Fargo Securities, LLC 


	 	CIBC World Markets Corp. 

  

	 Trade Date: 
	July 12, 2012 

  

	 Settlement Date: 
	July 24, 2012 (T+8 business days) 

  

	 Denominations: 
	$2,000 and integral multiples of $1,000 in excess of $2,000 


  
 A-2









 This Pricing Supplement is qualified in its entirety by reference to the Preliminary
Offering Memorandum dated July 12, 2012 
  
  

	 CUSIP/ISIN for Rule 144A Note: 
	909218 AC3 / US909218AC30 

  

	 CUSIP/ISIN for Regulation S Note: 
	U90931 AA1 / USU90931AA14 

  

	 Distribution: 
	144A and Regulation S with registration rights as set forth in the Preliminary Offering Memorandum 

 Other information (including financial information) presented in the Preliminary Offering Memorandum is deemed to have changed to the extent affected by the changes described herein. 

The securities have not been registered under the Securities Act of 1933, as amended (the “Securities Act”) and are being offered only to
(1) “qualified institutional buyers” as defined in Rule 144A under the Securities Act and (2) outside the United States to non-U.S. persons in compliance with Regulation S under the Securities Act. 

This material is confidential and is for your information only and is not intended to be used by anyone other than you. This information does not
purport to be a complete description of these Notes or the offering. Please refer to the Preliminary Offering Memorandum for a complete description. 

  
 A-3









 EXHIBIT B 
 Form of Reserve Letter 
 This letter, which is written at the request of
Unit Corporation (“the Company”), is being delivered to the Initial Purchasers pursuant to the terms of a purchase agreement between Unit Corporation (the “Company”) and the Initial Purchasers relating to the offering of $400
million aggregate principal amount of the Company’s senior subordinated notes due 2021, which are being offered by the Company pursuant to the Offering Memorandum dated July 12, 2012 (the “Offering Memorandum”). Our report letter
dated as of December 31, 2011 to the Company presented the Company’s estimates of Proved Reserves, attributable to interests of the Company as of December 31, 2011 (the “2011 Report”). In addition, we also delivered previous
reports to the Company for the years ended December 31, 2010, 2009 and 2008 (the “Previous Reports”). The 2011 Report and the Previous Reports are collectively referred to in this letter as the “Reports.” 

In connection with the foregoing, we hereby inform you as follows: 

 

	 	1.	As of the date of this letter and as of the date of the Reports, we are and were independent reserve engineers with respect to the Company as provided in the standards
pertaining to the estimating and auditing of oil and gas reserve information promulgated by the Society of Petroleum Engineers (the “SPE”). Neither we, nor to our knowledge, any of our employees, officers or directors, own interests in the
oil and gas properties included in the Reports. We have not been employed by the Company on a contingent basis. 

  

	 	2.	All terms used in this letter, where applicable, conform to the definitions set forth in Rule 4–10 of Regulation S–X promulgated by the SEC, relative to the
2008 Report and to the definitions and disclosure guidelines of the United States Securities and Exchange Commission (SEC) contained in Title 17, Code of Federal Regulations, Modernization of Oil and Gas Reporting, Final Rule released
January 14, 2009, in the Federal Register (SEC regulations) for the 2009, 2010 and 2011 Reports. 

  

	 	3.	Based on our review, including the data, technical processes and interpretations presented by Unit, it is our opinion that the overall procedures and methodologies
utilized by Unit in preparing their estimates of the proved reserves presented in the Reports comply with the SEC regulations in effect at the time of the estimate and that the overall proved reserves for the reviewed properties (Ryder Scott
reviewed approximately 70 percent of the total proved BOE) as estimated by Unit are, in the aggregate, reasonable within the established audit tolerance guidelines of 10 percent as set forth in the SPE auditing standards. 


 

	 	4.	Nothing has come to our attention that would lead us to believe that any disclosures, statements or references in the Offering Memorandum to the Company’s Proved
Reserves included in the Reports are inaccurate or inconsistent with the Reports in any material respect. 

  

	 	5.	The engineering projections included in the 2011 Report were based on the latest available production data, the majority through September, 2011. Although we were not
requested to review subsequent data concerning either the performance of the wells or field operations, no additional information has been brought to our attention that would lead us to believe that there would be a material change in the estimated
Proved Reserves attributable to the Company’s interests reflected in the 2011 Report. 


  
 B-1










	 	6.	You may rely upon our Reports in the same manner as if such reports were addressed to you providing that the reports are considered in their entirety including the
discussion on reserves definitions and guidelines. 

 We hereby consent to the references to our firm and the use
of the Reports as set forth in the Offering Memorandum. This letter is solely for the information of the addressees and to assist the addressees in documenting their investigations in connection with the offering of the securities covered by the
Offering Memorandum. 
  

	
	Very truly yours,
	
	 RYDER SCOTT COMPANY, L.P.

	TBPE Firm Registration No. F-1580



  
 B-2









 EXHIBIT C 
 Form of opinion of counsel for the Company to be delivered pursuant to 

Section 5(d) of the Purchase Agreement 
 (i) The Company has been duly incorporated and is validly existing as a corporation in good standing under the laws of the State of Delaware. 

(ii) The Company has the corporate power and authority to own, lease and operate its properties and to conduct its business as described
in the Pricing Disclosure Package and the Final Offering Memorandum; and the Company has the corporate power and authority to enter into and perform its obligations under the Transaction Documents to which it is a party. 

(iii) The Company is duly qualified as a foreign corporation to transact business and is in good standing in those jurisdictions on a
schedule or exhibit to such opinion. 
 (iv) Each Guarantor has been duly incorporated or formed, as applicable, and is validly
existing as a corporation or limited liability company, as applicable, in good standing under the laws of the jurisdiction of its incorporation or formation, has the corporate or limited liability company, as applicable, power and authority to own,
lease and operate its properties and to conduct its business as described in the Pricing Disclosure Package and the Final Offering Memorandum and to enter into and perform its obligations under the Transaction Documents to which it is a party. To
the best knowledge of such counsel, each Guarantor is duly qualified as a foreign corporation to transact business and is in good standing in each jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of
property or the conduct of business, except for such jurisdictions where the failure to so qualify or to be in good standing would not, individually or in the aggregate, result in a Material Adverse Change. 

(v) All of the issued and outstanding capital stock of each corporate Guarantor has been duly authorized and validly issued, is fully
paid and non-assessable and is owned by the Company, directly or through subsidiaries, free and clear of any security interest, mortgage, pledge, lien, encumbrance or, to the best knowledge of such counsel, any pending or threatened claim.

 (vi) All of the issued and outstanding limited liability company interest of each limited liability company Guarantor has
been duly authorized and validly issued and is owned by the Company, directly or through subsidiaries, free and clear of any security interest, mortgage, pledge, lien, encumbrance or, to the best knowledge of such counsel, any pending or threatened
claim. 
 (vii) No stockholder of the Company or any other person has any preemptive right, right of first refusal or other
similar right to subscribe for or purchase securities of the Company arising (i) by operation of the charter or by-laws of the Company or the General Corporation Law of the State of Delaware or (ii) to the best knowledge of such counsel,
otherwise. 
 (viii) The Purchase Agreement has been duly authorized, executed and delivered by the Company and each Guarantor.


  
 C-1









 (ix) The Registration Rights Agreement has been duly authorized, executed and delivered by,
and is a valid and binding agreement of, the Company and the Guarantors, enforceable in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other
similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles and except as rights to indemnification or contribution may be limited by applicable law. The DTC Agreement has been duly authorized,
executed and delivered by, and is a valid and binding agreement of, the Company, enforceable in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or
other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles. 
 (x) The
Indenture has been duly authorized, executed and delivered by the Company and each Guarantor and (assuming the due authorization, execution and delivery thereof by the Trustee) is a valid and binding agreement of the Company and each Guarantor,
enforceable against the Company and each Guarantor in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other similar laws relating to or
affecting the rights and remedies of creditors or by general equitable principles. 
 (xi) The Notes are in the form
contemplated by the Indenture, have been duly authorized by the Company for issuance and sale pursuant to the Purchase Agreement and the Indenture and, when executed by the Company and authenticated by the Trustee in the manner provided in the
Indenture (assuming the due authorization, execution and delivery of the Indenture by the Trustee) and delivered against payment of the purchase price therefor, will constitute valid and binding obligations of the Company, enforceable against the
Company in accordance with their terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other similar laws relating to or affecting enforcement of the rights and remedies
of creditors or by general equitable principles and will be entitled to the benefits of the Indenture. 
 (xii) The Exchange
Notes have been duly and validly authorized for issuance by the Company, and when issued and authenticated in accordance with the terms of the Existing Indenture, the Registration Rights Agreement and the Exchange Offer, will constitute valid and
binding obligations of the Company, enforceable against the Company in accordance with their terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium, or similar laws relating
to or affecting enforcement of the rights and remedies of creditors or by general principles of equity and will be entitled to the benefits of the Indenture. 
 (xiii) The Guarantees of the Notes are, and the Guarantees of the Exchange Notes, when issued will be, in the respective forms contemplated by the Indenture and the Existing Indenture, as applicable, and
the Guarantees of the Notes have been duly authorized for issuance pursuant to the Purchase Agreement and the Indenture. The Guarantees of the Notes have been duly executed by each of the Guarantors and, when the Notes have been authenticated in the
manner provided for in the Indenture (assuming the due authorization, execution and delivery of the Indenture by the Trustee) and delivered against payment of the purchase price therefor, will


  
 C-2









 
constitute valid and binding agreements of the Guarantors, enforceable in accordance with their terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, fraudulent
transfer, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles and will be entitled to the benefits of the Indenture. The Guarantees of the Exchange Notes
have been duly authorized for issuance pursuant to the Purchase Agreement and the Existing Indenture and, upon issuance of the Exchange Notes (assuming due execution and delivery), will constitute valid and binding agreements of the Guarantors,
enforceable in accordance with their terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of
creditors or by general equitable principles and will be entitled to the benefits of the Existing Indenture. 
 (xiv) The
Transaction Documents conform in all material respects to the descriptions thereof contained in the Pricing Disclosure Package and the Final Offering Memorandum. 
 (xv) The documents filed pursuant the Exchange Act incorporated by reference in the Pricing Disclosure Package and the Final Offering Memorandum (other than the financial statements or other financial
data derived therefrom, estimated oil and natural gas reserve estimations and related calculations, and assessments of or reports on the effectiveness of internal control over financial reporting included therein, as to which no opinion need be
rendered), when they were filed with the Commission, complied as to form in all material respects with the requirements of the Exchange Act. 
 (xvi) The statements in the Pricing Disclosure Package and the Final Offering Memorandum under the captions “Description of Other Indebtedness,” “Description of the Notes,”
“Material United States Federal Income Tax Consequences” and “Transfer Restrictions,” insofar as such statements constitute matters of law, summaries of legal matters, the Company’s charter or by-law provisions, documents or
legal proceedings, or legal conclusions, have been reviewed by such counsel and fairly present and summarize, in all material respects, the matters referred to therein. 
 (xvii) No consent, approval, authorization or other order of, or registration or filing with, any court or other governmental or regulatory authority or agency, other than those that have been obtained is
required for the execution, delivery and performance of the Transaction Documents, other than the Purchase and Sale Agreement, by the Company and the Guarantors to the extent a party thereto, or the issuance and delivery of the Securities or the
Exchange Securities, or consummation of the transactions contemplated hereby and thereby and by the Pricing Disclosure Package and the Final Offering Memorandum, except as required under the Exchange Act and such as have been obtained or made by the
Company and are in full force and effect under the Securities Act, applicable state securities or blue sky laws and except such as may be re- 

  
 C-3









 
quired by federal and state securities laws with respect to the obligations of the Company and the Guarantors under the Registration Rights Agreement. 

(xviii) The execution and delivery of the Transaction Documents, other than the Purchase and Sale Agreement, by the Company and the
Guarantors and the performance by the Company and the Guarantors to the extent a party thereto of their obligations thereunder (other than performance under the indemnification sections of the Purchase Agreement and Registration Rights Agreement, as
to which no opinion need be rendered): (i) have been duly authorized by all necessary corporate or limited liability company action on the part of the Company and the Guarantors, as applicable; (ii) will not result in any violation of the
provisions of the charter, by-laws or similar organizational document of the Company or any Guarantor; (iii) will not constitute a material Default or a Debt Repayment Triggering Event under, or result in the creation or imposition of any
material lien, charge or encumbrance upon any property or assets of the Company or any of its subsidiaries pursuant to, the Existing Indenture, the Senior Credit Agreement or any other material Existing Instrument listed on Schedule B
attached hereto; or (iv) will not result in any violation of any law or administrative regulation applicable to the Company or any of its subsidiaries which in such counsel’s experience would normally apply to transactions of the type
contemplated by the Transaction Documents or any administrative or court decree known to such counsel applicable to the Company or any of its subsidiaries. 
 (xix) Neither the Company nor any Guarantor is, and after receipt of payment for the Securities will be, an “investment company” within the meaning of Investment Company Act. 

(xx) To the best knowledge of such counsel, neither the Company nor any Guarantor is in violation of its charter, by-laws or similar
organizational document or any law or administrative regulation applicable to the Company or any Guarantor which in such counsel’s experience would normally apply to transactions of the type contemplated by the Transaction Documents or any
administrative or court decree known to such counsel applicable to the Company or any Guarantor or is in Default in the performance or observance of any obligation, agreement, covenant or condition contained in any material Existing Instrument
listed on Schedule B attached hereto, except in each such case for such violations or Defaults as would not, individually or in the aggregate, result in a Material Adverse Change. 

(xxi) To the best knowledge of such counsel and except as disclosed in the Pricing Disclosure Package and the Final Offering Memorandum,
there are no pending actions, suits or proceedings against or affecting the Company, the Guarantors or any of their respective subsidiaries, if determined adversely to the Company, the Guarantors or any of their respective subsidiaries, would
individually or in the aggregate result in a Material Adverse Change, or would materially and adversely affect the ability of the Company or the Guarantors to perform their obligations under the Indenture, this Agreement, the Registration Rights
Agreement or the Existing Indenture, or which are otherwise material in the context of the sale of the Securities; and, to such counsel’s knowledge, no such actions, suits or proceedings are threatened or contemplated. 

(xxii) Assuming the accuracy of the representations and warranties of the Company, the Guarantors and the Initial Purchasers, and
compliance with the covenants, contained herein, no registration of the Notes or the Guarantees under the Securities Act, and no qualification of an indenture under the Trust Indenture Act with respect thereto, is required in connection with the


  
 C-4









 
purchase of the Securities by the Initial Purchasers or the initial resale of the Securities by the Initial Purchasers to Qualified Institutional Buyers in the manner contemplated by this
Agreement and the Pricing Disclosure Package and the Final Offering Memorandum other than any registration or qualification that may be required in connection with the Exchange Offer contemplated by the Pricing Disclosure Package and the Final
Offering Memorandum or in connection with the Registration Rights Agreement. Such counsel need express no opinion, however, as to when or under what circumstances any Initial Notes initially sold by the Initial Purchasers may be reoffered or resold.

 In rendering such opinion, such counsel may rely as to matters involving the application of laws of any jurisdiction other
than the General Corporation Law of the State of Delaware, the laws of the State of New York or the federal law of the United States, to the extent they deem proper and specified in such opinion, upon the opinion (which shall be dated the Closing
Date shall be satisfactory in form and substance to the Initial Purchasers, shall expressly state that the Initial Purchasers may rely on such opinion as if it were addressed to them and shall be furnished to the Initial Purchasers) of other counsel
of good standing whom they believe to be reliable and who are satisfactory to counsel for the Initial Purchasers; provided, however, that such counsel shall further state that they believe that they and the Initial Purchasers are justified in
relying upon such opinion of other counsel, and as to matters of fact, to the extent they deem proper, on certificates of responsible officers of the Company and public officials. 

In addition, such counsel shall state that they have participated in conferences with officers and other representatives of the Company,
representatives of the independent registered public accountants for the Company and with representatives of the Initial Purchasers at which the contents of the Pricing Disclosure Package and the Final Offering Memorandum and related matters were
discussed and, although such counsel is not passing upon and does not assume any responsibility for the accuracy, completeness or fairness of the statements contained in the Pricing Disclosure Package or the Final Offering Memorandum (other than as
specified above in paragraph (xvi) of such counsel’s opinion), on the basis of the foregoing, nothing has come to their attention which would lead them to believe that the Pricing Disclosure Package, as of the Time of Sale, or that the
Final Offering Memorandum, as of its date or at the Closing Date, contained or contains an untrue statement of a material fact or omitted or omits to state a material fact necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading (it being understood that such counsel need express no belief as to the content of the financial statements or other financial data derived therefrom, estimated oil and natural gas reserve
estimations and related calculations, and assessments of or reports on the effectiveness of internal control over financial reporting included or incorporated by reference in the Pricing Disclosure Package or the Final Offering Memorandum or any
amendments or supplements thereto). 

  
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 EXHIBIT D 
 Form of Opinion of General Counsel for the Company 
 Opinion of General
Counsel for the Company to be delivered pursuant to Section 5(e) of the Purchase Agreement. 
 [UNIT
CORPORATION LETTERHEAD] 
 July     , 2012 

MERRILL LYNCH, PIERCE, FENNER & SMITH 

                    INCORPORATED

     As Representative of the Initial Purchasers 
 One Bryant Park 
 New York, New York 10036 

Ladies and Gentlemen: 
 I am General Counsel of Unit Corporation, a Delaware corporation (the “Company”), and of Unit Drilling Company, an Oklahoma corporation, Unit Petroleum Company, an Oklahoma corporation,
Superior Pipeline Company, L.L.C., an Oklahoma limited liability company, Unit Texas Drilling, L.L.C., an Oklahoma limited liability company, Unit Drilling USA Colombia, L.L.C., a Delaware limited liability company, Unit Drilling Colombia, L.L.C., a
Delaware limited liability company, Unit Texas Company, an Oklahoma corporation, Superior Pipeline Texas, L.L.C., an Oklahoma limited liability company, Superior Appalachian Pipeline, L.L.C., an Oklahoma limited liability company, Unit Drilling and
Exploration Company, a Delaware corporation, Petroleum Supply Company, an Oklahoma corporation, and Preston County Gas Gathering, L.L.C., a Delaware limited liability company (together, the “Guarantors”), and have acted as counsel
to the Company and the Guarantors in connection with the sale on the date hereof of $400,000,000 aggregate principal amount of
6 5/8% Senior Subordinated Notes due 2021 of the Company to the Initial Purchasers named in Schedule A to that certain Purchase Agreement, dated as of July 12, 2012 (the “Purchase
Agreement”), among the Company, the Guarantors and you as the Representative of the Initial Purchasers. Capitalized terms used but not defined herein have the definitions ascribed to such terms in the Purchase Agreement. 

This opinion is furnished to the Initial Purchasers pursuant to Section 6(e) of the Purchase Agreement. Except as otherwise provided
herein, capitalized terms used but not otherwise defined herein shall have the meanings set forth in the Purchase Agreement. 

In connection with this opinion, I or other attorneys acting under my supervision have (i) investigated such questions of law,
(ii) examined such corporate documents and records of the Company and the Guarantors and certificates of public officials, and (iii) received such informa-

  
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tion from officers and representatives of the Company and the Guarantors and made such investigations as I or other attorneys under my supervision have deemed necessary or appropriate for the
purposes of this opinion. I have not, nor have other attorneys under my supervision, made any independent investigation or review of the records of any court, arbitrator, or governmental authority affecting any person, and no inference as to my
knowledge thereof shall be drawn from the fact of my representation of any party or otherwise. 
 Based upon and subject to the
foregoing and the other qualifications, limitations, and assumptions set forth below and upon such other matters as I have deemed appropriate, I am of the opinion that the Company and each Guarantor possess such valid and current licenses,
certificates, authorizations or permits issued by the appropriate state, federal or foreign regulatory agencies or bodies necessary to conduct their respective businesses, and none of the Company nor any Guarantor has received any notice of
proceedings relating to the revocation or modification of, or non-compliance with, any such license, certificate, authorization or permit which, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would result
in a Material Adverse Change. 
 I am a member of the bar of the State of Oklahoma. My opinion expressed above is limited to the
laws of the State of Oklahoma, and I do not express any opinion herein concerning the laws of any other jurisdiction. 
 This
opinion speaks as of its date, and I undertake no, and hereby expressly disclaim any, duty to advise you as to changes of fact or law coming to my attention after the date hereof. 

This opinion is rendered to you pursuant to the Purchase Agreement, is for the sole benefit of, and may only be relied upon by, you and
the other Initial Purchasers and your counsel, and is not to be quoted in whole or in part or otherwise referred to, nor is it to be filed with or delivered or communicated to any government agency or any other person, without my prior written
consent. 
  

	
	Very truly yours,
	
	 Mark E. Schell

	 General Counsel of the Company and
 each of the Guarantors




  
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 ANNEX I 
 Resale Pursuant to Regulation S or Rule 144A. Each Initial Purchaser understands that: 
 Such Initial Purchaser agrees that it has not offered or sold and will not offer or sell the Securities in the United States or to, or for the benefit or account of, a U.S. person (other than a
distributor), in each case, as defined in Rule 902 of Regulation S (i) as part of its distribution at any time and (ii) otherwise until 40 days after the later of the commencement of the offering of the Securities pursuant hereto
and the Closing Date, other than in accordance with Regulation S or another exemption from the registration requirements of the Securities Act. Such Initial Purchaser agrees that, during such 40-day restricted period, it will not cause any
advertisement with respect to the Securities (including any “tombstone” advertisement) to be published in any newspaper or periodical or posted in any public place and will not issue any circular relating to the Securities, except such
advertisements as are permitted by and include the statements required by Regulation S. 
 Such Initial Purchaser agrees
that, at or prior to confirmation of a sale of Securities by it to any distributor, dealer or person receiving a selling concession, fee or other remuneration during the 40-day restricted period referred to in Rule 903 of Regulation S, it
will send to such distributor, dealer or person receiving a selling concession, fee or other remuneration a confirmation or notice to substantially the following effect: 
 “The Securities covered hereby have not been registered under the U.S. Securities Act of 1933, as amended (the “Securities Act”), and may not be offered and sold within the United States or
to, or for the account or benefit of, U.S. persons (i) as part of your distribution at any time or (ii) otherwise until 40 days after the later of the date the Securities were first offered to persons other than distributors in reliance
upon Regulation S and the Closing Date, except in either case in accordance with Regulation S under the Securities Act (or in accordance with Rule 144A under the Securities Act or to accredited investors in transactions that are exempt
from the registration requirements of the Securities Act), and in connection with any subsequent sale by you of the Securities covered hereby in reliance on Regulation S under the Securities Act during the period referred to above to any
distributor, dealer or person receiving a selling concession, fee or other remuneration, you must deliver a notice to substantially the foregoing effect. Terms used above have the meanings assigned to them in Regulation S under the Securities
Act.” 
 Terms used above have the meanings assigned to them in Regulation S under the Securities Act. 

  
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