Exhibit 10.31
 SECOND AMENDMENT TO COMBINED CREDIT AGREEMENTS
 Amendment QUICKSILVER RESOURCES INC. U.S. Borrower QUICKSILVER RESOURCES CANADA INC. Canadian Borrower U.S. Lenders Canadian
Lenders Combined Lenders JPMORGAN CHASE
BANK, N.A. Global Administrative
Agent JPMORGAN CHASE BANK, N.A., TORONTO BRANCH Canadian Administrative Agent
 W I T N E S S E T H:
 U.S.
Credit Agreement
 Canadian Credit Agreement Combined Credit Agreements
   I. Amendments to U.S. Credit Agreement
 Applicable Margin
 Applicable Margin
 1




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Global Borrowing
Base Utilization:
    
    
    Eurodollar
    
    
    ABR
Loans(in basis points)
    
    
    Specified Rate
    
    
    Commitment Fees(in basis points)Loans
    
    
    
    
    Swingline Loans(in basis points)
    
    
    
    
    (in basis points)Less than 50%
    
    
    
    112.5
    
    
    
    
    0
    
    
    
    
    112.5
    
    
    
    
    25.050% or greater and
less than 75%
    
    
    

137.5
    
    
    
    

0
    
    
    
    
    137.5
    
    
    
    
    30.075% or greater and
less than 90%
    
    
    
    162.5
    
    
    
    
    0
    
    
    
    
    162.5
    
    
    
    
    35.090% or greater
    
    
    
    187.5
    
    
    
    
    0
    
    
    
    
    187.5
    
    
    
    
    37.5
  Redetermination Date
 Redetermination Date Section 2.8(e) Section 2.8(e)
  Designation of Material Subsidiaries Section 5.15 clauses (b)(ii) (iii) provided
 2




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Section 4.1(g) Section 5.15 Section 5.17
  Hedge Transactions Initial Measurement Period Second Measurement Period Third Measurement
Period
 3




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plus provided Section 2.8 provided
  II. Amendments to Canadian Credit Agreement
 Applicable Margin
 Applicable Margin
 4




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Global BorrowingBase Utilization:
    
    
    EurodollarLoans(in basis points)
    
    
    U.S. PrimeLoans(in basis points)
    
    
    CanadianPrime Loans(in basis points)
    
    
    Bankers
    
    
    CommitmentFees(in basis points)AcceptancesStamping Fee(in basis points)Less than 50%
    
    
    112.5
    
    
    0
    
    
    0
    
    
    112.5
    
    
    25.050%
or greater and less than 75%
    
    

137.5
    
    

0
    
    

0
    
    

137.5
    
    

30.075%
or greater and less than 90%
    
    

162.5
    
    

0
    
    

0
    
    

162.5
    
    

35.090% or greater
    
    
    187.5
    
    
    0
    
    
    0
    
    
    187.5
    
    
    37.5
   III. Global Borrowing Base
 Interim Redetermination Date
 Interim Redetermination provided
 5




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provided
   IV. Rearrangement of Existing Loans
  6




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Existing Lenders
 V. Effectiveness Effective Date
    VI. Reaffirmation of Representations and Warranties
 Combined
Loan Parties
 7




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8




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VII. Defined Terms
 VIII. Reaffirmation of Combined Credit Agreements
 IX. Governing Law THIS AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE WITH THE LAWS OF
THE STATE OF TEXAS.
 NOTWITHSTANDING THE FOREGOING SENTENCE AND AFTER GIVING EFFECT TO THE TEXTUAL AMENDMENTS
CONTAINED IN SECTIONS I AND II OF THIS AMENDMENT, (i) THE U.S. CREDIT AGREEMENT (AS
AMENDED HEREBY) SHALL CONTINUE TO BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW
SPECIFIED IN SECTION 10. 9(a) OF THE U.S. CREDIT AGREEMENT, AND (ii) THE CANADIAN CREDIT AGREEMENT
(AS AMENDED HEREBY) SHALL CONTINUE TO BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW
SPECIFIED IN SECTION 10. 9(a) OF THE CANADIAN CREDIT AGREEMENT.
 X. Severability of Provisions
 XI. Counterparts
 XII. Headings
 9




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XIII. Successors and Assigns
 XIV. No Oral Agreements THIS AMENDMENT, THE COMBINED CREDIT AGREEMENTS, AS AMENDED
HEREBY, AND THE OTHER COMBINED LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN AND AMONG THE
PARTIES WITH RESPECT TO THE SUBJECT MATTER HEREOF AND THEREOF AND MAY NOT BE CONTRADICTED BY
EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO
UNWRITTEN ORAL AGREEMENTS AMONG THE PARTIES.
 XV. Loan Document . This Amendment constitutes a Loan Document, a Canadian Loan
Document and a Combined Loan Document under and as defined in the U.S. Credit Agreement, and a
Loan Document, a U.S. Loan Document and a Combined Loan Document under and as defined in the
Canadian Credit Agreement.
 [Signature Pages to Follow]
 10




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U.S. BORROWERQUICKSILVER RESOURCES INC.,
a Delaware corporation, as U.S. BorrowerBy:
    /s/ MarLu HillerMarLu Hiller, Vice President  TreasurerCANADIAN BORROWERQUICKSILVER RESOURCES CANADA INC.,
an Alberta, Canada corporation, as Canadian BorrowerBy:
    /s/ MarLu HillerMarLu Hiller,  Vice President  Treasurer Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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AGENTS AND COMBINED LENDERSJPMORGAN CHASE BANK, N.A., as Global Administrative
Agent and as a U.S. LenderBy:
    /s/ J. Scott FowlerJ. Scott FowlerSenior Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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JPMORGAN CHASE BANK, N.A., TORONTO BRANCH, as a
Canadian Administrative Agent and as a Canadian
LenderBy:
    /s/ Michael N. TamName:
    Michael N. TamTitle:
    Senior Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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BANK OF AMERICA, N.A., as a U.S. LenderBy:
    /s/ Ronald E. McKaigName:
    
    Ronald E. McKaigTitle:
    
    Senior Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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BNP PARIBAS, as a U.S. LenderBy:
    /s/ Russell OttsName:
    
    Russell OttsTitle:
    
    DirectorBy:
    /s/ Robert LongName:
    
    Robert LongTitle:
    
    Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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FORTIS CAPITAL CORP., as a U.S. LenderBy:
    /s/ David MontgomeryName:
    
    David MontgomeryTitle:
    
    DirectorBy:
    /s/ Darrell HolleyName:
    
    Darrell HolleyTitle:
    
    Managing Director Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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THE BANK OF NOVA SCOTIA, as a U.S. LenderBy:
    /s/ David MillsName:
    
    David MillsTitle:
    
    Director Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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DEUTSCHE BANK TRUST COMPANY AMERICAS, as a U.S.
LenderBy:
    /s/ Dusan LazarovName:
    
    Dusan LazarovTitle:
    
    Vice PresidentBy:
    /s/ Erin MorrisseyName:
    
    Erin MorrisseyTitle:
    
    Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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THE ROYAL BANK OF SCOTLAND plc, as a U.S. LenderBy:
    /s/ Lucy WalkerName:
    
    Lucy WalkerTitle:
    
    Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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CALYON NEW YORK BRANCH, as a U.S. LenderBy:
    /s/ Sharada ManneName:
    
    Sharada ManneTitle:
    
    DirectorBy:
    /s/ Michael D. WillisName:
    
    Michael D. WillisTitle:
    
    Director Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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CITIBANK, N.A., as a U.S. LenderBy:
    /s/ David E. HuntName:
    
    David E. HuntTitle:
    
    Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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UNION BANK OF CALIFORNIA, N.A., as a U.S. LenderBy:
    /s/ Alison FuquaName:
    
    Alison FuquaTitle:
    
    Assistant Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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WELLS FARGO BANK, N.A., as a U.S. LenderBy:
    /s/ Charles D. KirkhamName:
    
    Charles D. KirkhamTitle:
    
    Senior Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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TORONTO DOMINION (TEXAS) LLC, as a U.S. LenderBy:
    /s/ Debbi L. BritoName:
    
    Debbi L. BritoTitle:
    
    Authorized Signatory Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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U.S. BANK NATIONAL ASSOCIATION, as a U.S. LenderBy:
    /s/ Daria MahoneyName:
    
    Daria MahoneyTitle:
    
    Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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COMPASS BANK, as a U.S. LenderBy:
    /s/ Murray E. BrasseuxName:
    
    Murray E. BrasseuxTitle:
    
    Executive Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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SOCIÉTÉ GÉNÉRALE, as a U.S. LenderBy:
    /s/ Stephen W. WarfelName:
    
    Stephen W. WarfelTitle:
    
    Managing Director Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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COMERICA BANK, as a U.S. LenderBy:
    /s/ Rebecca L. WilsonName:
    
    Rebecca L. WilsonTitle:
    
    Assistant Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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STERLING BANK, as a U.S. LenderBy:
    /s/ Melissa A. BaumanName:
    
    Melissa A. BaumanTitle:
    
    Senior Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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CIBC INC., as a U.S. LenderBy:
    /s/ Dominic J. SorressoName:
    
    Dominic J. SorressoTitle:
    
    Executive DirectorCIBC World Market Corp.
Authorized Signatory Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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KEYBANK, N.A., as a U.S. LenderBy:
    /s/ Thomas RajanName:
    
    Thomas RajanTitle:
    
    Managing Director Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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EXPORT DEVELOPMENT CANADA, as a U.S. LenderBy:
    /s/ François MorelName:
    
    François MorelTitle:
    
    Sr. Financing ManagerBy:
    /s/ Margaret MichalskiName:
    
    Margaret MichalskiTitle:
    
    Senior Associate Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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BARCLAYS BANK PLC, as a U.S. LenderBy:
    /s/ Joseph GyurindakName:
    
    Joseph GyurindakTitle:
    
    Director Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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CREDIT SUISSE, CAYMAN ISLANDS BRANCH, as a U.S.
LenderBy:
    /s/ Doreen BarrName:
    
    Doreen BarrTitle:
    
    Vice PresidentBy:
    /s/ Morenikeji AjayiName:
    
    Morenikeji AjayiTitle:
    
    Associate Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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BANK OF AMERICA, N.A.(by its Canada branch), as
a Canadian LenderBy:
    /s/ Medina Sales de AndradeName:
    
    Medina Sales de AndradeTitle:
    
    Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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BNP PARIBAS (CANADA), as a Canadian LenderBy:
    /s/ Christopher RiceName:
    
    Christopher RiceTitle:
    
    Vice PresidentBy:
    /s/ Michael GosselinName:
    
    Michael GosselinTitle:
    
    Managing Director Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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FORTIS CAPITAL (CANADA) LTD., as a Canadian
LenderBy:
    /s/ Doug ClarkName:
    
    Doug ClarkTitle:
    
    DirectorBy:
    /s/ Cory WallinName:
    
    Cory WallinTitle:
    
    Assistant Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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THE BANK OF NOVA SCOTIA, as a Canadian LenderBy:
    /s/ Andrew KellockName:
    
    Andrew KellockTitle:
    
    DirectorBy:
    /s/ Todd KennedyName:
    
    Todd KennedyTitle:
    
    Associate Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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DEUTSCHE BANK AG CANADA BRANCH, as a Canadian
LenderBy:
    /s/ Robert A. JohnstonName:
    
    Robert A. JohnstonTitle:
    
    DirectorBy:
    /s/ Marcellus LeungName:
    
    Marcellus LeungTitle:
    
    Assistant Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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CITIBANK, N.A., CANADIAN BRANCH, as a Canadian
LenderBy:
    /s/ Niyousha ZarinpourName:
    
    Niyousha ZarinpourTitle:
    
    Authorized Signer Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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UNION BANK OF CALIFORNIA, N.A., CANADA BRANCH,
as a Canadian LenderBy:
    /s/ Phil TaylorName:
    
    Phil TaylorTitle:
    
    Senior Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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WELLS FARGO FINANCIAL CORPORATION CANADA, as a
Canadian LenderBy:
    /s/ Nick ScarfoName:
    
    Nick ScarfoTitle:
    
    Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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THE TORONTO-DOMINION BANK, as a Canadian LenderBy:
    /s/ Debbi L. BritoName:
    
    Debbi L. BritoTitle:
    
    Authorized Signatory Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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U.S. BANK NATIONAL ASSOCIATION, as a Canadian
LenderBy:
    /s/  Kevin JephcottName:
    
    Kevin JephcottTitle:
    
    Principal Officer Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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SUMITOMO MITSUI BANKING CORPORATION OF CANADA,
as a Canadian LenderBy:
    /s/ Alfred LeeName:
    
    Alfred LeeTitle:
    
    Senior Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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SOCIÉTÉ GÉNÉRALE (CANADA BRANCH), as a Canadian
LenderBy:
    /s/ David BALDONIName:
    
    David BALDONITitle:
    
    Managing DirectorBy:
    /s/ Paul PRIMAVESIName:
    
    Paul PRIMAVESITitle:
    
    Vice President Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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COMERICA BANK, CANADA BRANCH, as a Canadian
LenderBy:
    /s/ Omer AhmedName:
    
    Omer AhmedTitle:
    
    Portfolio Manager Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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CANADIAN IMPERIAL BANK OF COMMERCE, as a
Canadian LenderBy:
    /s/ Randy GeislingerName:
    
    Randy GeislingerTitle:
    
    Executive DirectorBy:
    /s/ Chris PerksName:
    
    Chris PerksTitle:
    
    Executive Director Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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KEYBANK, N.A., as a Canadian LenderBy:
    /s/ Kevin HaysName:
    
    Kevin HaysTitle:
    
    Director Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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BARCLAYS BANK PLC, as a Canadian LenderBy:
    /s/ Joseph GyurindakName:
    
    Joseph GyurindakTitle:
    
    Director Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.




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CREDIT SUISSE, TORONTO BRANCH, as a Canadian
LenderBy:
    /s/ Alain DaoustName:
    
    Alain DaoustTitle:
    
    DirectorBy:
    /s/ Bruce F. WetherlyName:
    
    Bruce F. WetherlyTitle:
    
    Director,CREDIT SUISSE, TORONTO BRANCH Second Amendment to Combined Credit Agreements  Quicksilver Resources Inc.