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|   | Exhibit 21                                                                                                                                                                                             |
|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|   |                                                                                                                                                                                                        |
|   | SUBSIDIARIES OF THE REGISTRANT                                                                                                                                                                              |
|   |                                                                                                                                                                                                        |
|   | ·   Warrior Gas Co., a Texas corporation, which has a wholly owned subsidiary, Clajon Industrial Gas, Inc., a Texas corporation                                                              |
|   | ·   Clayton Williams Trading Company, a Texas corporation                                                                                                                                    |
|   | ·   Clayton Williams Venezuela, Inc., a Delaware corporation                                                                                                                                 |
|   | ·   CWEI Acquisitions, Inc., a Delaware corporation                                                                                                                                          |
|   | ·   Clayton Williams Pipeline Corporation (formerly Clayton Williams Midland, Inc.), a Delaware corporation                                                                                  |
|   | ·   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.)                         |
|   | ·   Warrior Mississippi Corporation, a Delaware corporation                                                                                                                                  |
|   | ·   Southwest Royalties, Inc., a Delaware corporation, which has two wholly owned subsidiaries, Blue Heel Company, a Delaware corporation and Tex-Hal Partners, Inc., a Delaware corporation |
|   | ·   West Coast Energy Properties GP, LLC, a Texas limited liability company                                                                                                                  |
|   | ·   Desta Drilling GP, LLC, a Texas limited liability company                                                                                                                                |
|   |                                                                                                                                                                                                        |