Southwest Royalties S-4 Registration of securities issued in business combination transactions

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Exhibit 21.1

SUBSIDIARIES OF THE REGISTRANT

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Warrior Gas Co., a Texas corporation, which has a wholly owned subsidiary, Clajon Industrial Gas, Inc., a Texas corporation

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Clayton Williams Trading Company, a Texas corporation

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CWEI Aviation, Inc., a Texas corporation

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CWEI Acquisitions, Inc., a Delaware corporation

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Clayton Williams Pipeline Corporation (formerly Clayton Williams Midland, Inc.), a Delaware corporation

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CWEI Romere Pass Acquisition Corp., a Delaware corporation, which is the sole member of Romere Pass Acquisition, L.L.C. (formerly Romere Pass Acquisition Corp.)

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Warrior Mississippi Corporation, a Delaware corporation

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Southwest Royalties, Inc., a Delaware corporation, which has three wholly owned subsidiaries, Blue Heel Company, a Delaware corporation, Tex-Hal Partners, Inc., a Delaware corporation and SWR VPP, LLC, a Texas limited liability company

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West Coast Energy Properties GP, LLC, a Texas limited liability company

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Desta Drilling GP, LLC, a Texas limited liability company

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CWEI Partners GP, LLC, a Delaware corporation, which has a wholly owned subsidiary, CWEI Partners Operating, LLC

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CWEI Andrews Properties GP, LLC, a Delaware corporation

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Exhibit 21.1

SUBSIDIARIES OF THE REGISTRANT