| 610715 | Dec 12, 2005 | Dec 12, 2005 | Occidental Permian Ltd. | Preston #2 | 7,500 | 18930474 |
| 603273 | Jul 19, 2005 | Jul 19, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #561 | 6,500 | 18930470 |
| 603275 | Jul 13, 2005 | Jul 13, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #563 | 6,500 | 18930472 |
| 603274 | Jul 13, 2005 | Jul 13, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #562 | 6,500 | 18930471 |
| 603272 | Jul 13, 2005 | Jul 13, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #560 | 6,500 | 18930469 |
| 603272Amendment | Jul 13, 2005 | Jul 13, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #560 | 6,500 | 18930469 |
| 603271 | Jul 13, 2005 | Jul 13, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #559 | 6,500 | 18930468 |
| 603271Amendment | Jul 13, 2005 | Jul 13, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #559 | 6,500 | 18930468 |
| 603270 | Jul 13, 2005 | Jul 13, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #558 | 6,500 | 18930467 |
| 603269 | Jul 13, 2005 | Jul 13, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #557 | 6,500 | 18930466 |
| 603268 | Jul 13, 2005 | Jul 13, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #556 | 6,500 | 18930465 |
| 603267 | Jul 13, 2005 | Jul 13, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #555 | 6,500 | 18930464 |
| 603266 | Jul 13, 2005 | Jul 13, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #554 | 6,500 | 18930473 |
| 603265 | Jul 13, 2005 | Jul 13, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #553 | 6,500 | 18930463 |
| 603264 | Jul 13, 2005 | Jul 13, 2005 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #552 | 6,500 | 18930462 |
| 552950 | Nov 2, 2004 | Nov 2, 2004 | Occidental Permian Ltd. | J. A. Lee #1 | 7,500 | 18930369 |
| 551198 | Sep 20, 2004 | Sep 20, 2004 | Occidental Permian Ltd. | Preston #1 | 7,500 | 18930461 |
| 544391 | Apr 14, 2004 | Apr 14, 2004 | Devon Energy Production Co, L.P. | Hufstedler #1 | 7,500 | 18930438 |
| 544028 | Apr 8, 2004 | Apr 8, 2004 | Cambrian Management Ltd | Alm #1 | 6,200 | 18930460 |
| 539157 | Dec 5, 2003 | Dec 5, 2003 | Devon Energy Production Co, L.P. | Hufstedler #2H | 6,551 | 18930447 |
| 528750 | Mar 4, 2003 | Mar 4, 2003 | Atmos Energy Corporation | City of Painview Row #C024PL | 520 | 18930459 |
| 522783 | Aug 14, 2002 | Aug 14, 2002 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #551 | 6,500 | 18930458 |
| 522778 | Aug 14, 2002 | Aug 14, 2002 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #550 | 6,500 | 18930457 |
| 522776 | Aug 14, 2002 | Aug 14, 2002 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #549 | 6,500 | 18930456 |
| 519205 | Apr 18, 2002 | Apr 18, 2002 | Devon SFS Operating, Inc. | Myatt #2 | 7,000 | 18930455 |
| 518193 | Mar 11, 2002 | Mar 11, 2002 | Occidental Permian Ltd. | Irish #1 | 7,500 | 18930443 |
| 518107 | Mar 11, 2002 | Mar 11, 2002 | Occidental Permian Ltd. | Irish B #1 | 7,500 | 18930453 |
| 518109 | Mar 7, 2002 | Mar 7, 2002 | Occidental Permian Ltd. | Preston #1 | 7,500 | 18930454 |
| 518108 | Mar 7, 2002 | Mar 7, 2002 | Occidental Permian Ltd. | Eason #3 | 7,500 | 18930452 |
| 516949 | Jan 23, 2002 | Jan 23, 2002 | Occidental Permian Ltd. | Rollinsford #1 | 7,500 | 18930445 |
| 516669 | Jan 9, 2002 | Jan 9, 2002 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #546 | 6,500 | 18930451 |
| 516668 | Jan 9, 2002 | Jan 9, 2002 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #547 | 6,500 | 18930450 |
| 516667 | Jan 9, 2002 | Jan 9, 2002 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #548 | 6,500 | 18930449 |
| 516321 | Dec 20, 2001 | Dec 20, 2001 | Devon SFS Operating, Inc. | Hufstedler #1H | 6,665 | 18930438 |
| 516321Amendment | Dec 20, 2001 | Dec 20, 2001 | Devon SFS Operating, Inc. | Hufstedler #1H | 6,665 | 18930438 |
| 515694 | Dec 3, 2001 | Dec 3, 2001 | Occidental Permian Ltd. | Eason #2 | 7,500 | 18930448 |
| 514549 | Oct 17, 2001 | Oct 17, 2001 | Devon SFS Operating, Inc. | Hufstedler #2 | 750 | 18930447 |
| 514549Amendment | Oct 17, 2001 | Oct 17, 2001 | Devon SFS Operating, Inc. | Hufstedler #2 | 7,500 | 18930447 |
| 514549Amendment | Oct 17, 2001 | Oct 17, 2001 | Devon SFS Operating, Inc. | Hufstedler #2H | 7,444 | 18930447 |
| 513909 | Sep 27, 2001 | Sep 27, 2001 | Occidental Permian Ltd. | Eason #1 | 7,500 | 18930446 |
| 513909Amendment | Sep 27, 2001 | Sep 27, 2001 | Occidental Permian Ltd. | Eason #1 | 7,500 | 18930446 |
| 513808 | Sep 25, 2001 | Sep 25, 2001 | Occidental Permian Ltd. | Rollinsford #1 | 7,500 | 18930445 |
| 513029 | Aug 31, 2001 | Aug 31, 2001 | Occidental Permian Ltd. | Snead "B" #2 | 7,500 | 18930444 |
| 512657 | Aug 16, 2001 | Aug 16, 2001 | Occidental Permian Ltd. | Irish #1 | 7,500 | 18930443 |
| 511144 | Jul 9, 2001 | Jul 9, 2001 | Occidental Permian Ltd. | Snead "B" #1 | 7,500 | 18930442 |
| 511144Amendment | Jul 9, 2001 | Jul 9, 2001 | Occidental Permian Ltd. | Snead "B" #1H | 7,500 | 18930442 |
| 511143 | Jul 9, 2001 | Jul 9, 2001 | Occidental Permian Ltd. | Myatt #1 | 7,500 | 18930439 |
| 511142 | Jul 9, 2001 | Jul 9, 2001 | Occidental Permian Ltd. | Myatt #2 | 7,500 | 18930440 |
| 511141 | Jul 9, 2001 | Jul 9, 2001 | Occidental Permian Ltd. | Snead #2 | 7,500 | 18930441 |
| 511141Amendment | Jul 9, 2001 | Jul 9, 2001 | Occidental Permian Ltd. | Snead #2 | 7,500 | 18930441 |
| 511082 | Jul 5, 2001 | Jul 5, 2001 | Devon Energy Production Co, L.P. | Hufstedler #1 | 7,500 | 18930438 |
| 511082Amendment | Jul 5, 2001 | Jul 5, 2001 | Devon SFS Operating, Inc. | Hufstedler #1 | 7,500 | 18930438 |
| 511081 | Jul 5, 2001 | Jul 5, 2001 | Devon Energy Production Co, L.P. | Myatt #1 | 7,500 | 18930437 |
| 511081Amendment | Jul 5, 2001 | Jul 5, 2001 | Devon SFS Operating, Inc. | Myatt #1 | 7,500 | 18930437 |
| 510263 | Jun 19, 2001 | Jun 19, 2001 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #228 | 6,500 | 18930015 |
| 510262 | Jun 15, 2001 | Jun 15, 2001 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #274 | 6,500 | 18930052 |
| 510261 | Jun 15, 2001 | Jun 15, 2001 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #220 | 6,500 | 18930022 |
| 507298 | Apr 4, 2001 | Apr 4, 2001 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #545 | 6,500 | 18930436 |
| 505946 | Mar 2, 2001 | Mar 2, 2001 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #544 | 6,500 | 18930435 |
| 505945 | Mar 2, 2001 | Mar 2, 2001 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #543 | 6,500 | 18930434 |
| 505944 | Mar 2, 2001 | Mar 2, 2001 | Occidental Permian Ltd. | Snead #1 | 7,500 | 18930432 |
| 505943 | Mar 2, 2001 | Mar 2, 2001 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #542 | 6,500 | 18930433 |
| 498355 | Sep 18, 2000 | Sep 18, 2000 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #540 | 6,500 | 18930429 |
| 499022 | Sep 7, 2000 | Sep 7, 2000 | Energas Company | City of Plainview R.O.W. #C024PL | 520 | 18930431 |
| 498357 | Aug 16, 2000 | Aug 16, 2000 | Occidental Permian Ltd. | Anton-Irish Clearfork Unit #539 | 6,500 | 18930430 |
| 494626 | May 4, 2000 | May 4, 2000 | Altura Energy Ltd. | Anton-Irish Clearfork Unit #182 | 6,200 | 18900160 |
| 470823 | Jan 27, 1998 | Jan 27, 1998 | Altura Energy Ltd. | Anton-Irish Clearfork Unit #537 | 6,200 | 18930428 |
| 470821 | Dec 16, 1997 | Dec 16, 1997 | Altura Energy Ltd. | Anton-Irish Clearfork Unit #535 | 6,200 | 18930427 |
| 452825 | Sep 26, 1996 | Sep 26, 1996 | Energas Company | City of Plainview R.O.W. #C021PL | 550 | 18930426 |
| 448839 | Jun 6, 1996 | Jun 6, 1996 | Amoco Production Company | Anton-Irish Clearfork Unit #508 | 8,000 | 18930399 |
| 448838 | Jun 6, 1996 | Jun 6, 1996 | Amoco Production Company | Anton-Irish Clearfork Unit #317 | 8,000 | 18930114 |
| 445810 | Mar 18, 1996 | Mar 18, 1996 | Amoco Production Company | Rice, C.A. #10 | 11,000 | 18930413 |
| 440227 | Sep 28, 1995 | Sep 28, 1995 | Energas Company | City of Abernathy R.O.W. #C006AB | 450 | 18930425 |
| 440226 | Sep 28, 1995 | Sep 28, 1995 | Energas Company | City of Abernathy R.O.W. #C005AB | 450 | 18930424 |
| 440225 | Sep 28, 1995 | Sep 28, 1995 | Energas Company | City of Abernathy R.O.W. #C004AB | 450 | 18930423 |
| 428498 | Nov 21, 1994 | Nov 21, 1994 | Energas Company | City of Plainview R.O.W. #C020PL | 530 | 18930419 |
| 428497 | Oct 13, 1994 | Oct 13, 1994 | Energas Company | City of Hale Center R.O.W. #C002HC | 560 | 18930422 |
| 428495 | Oct 13, 1994 | Oct 13, 1994 | Energas Company | City of Hale Center R.O.W. #C004HC | 560 | 18930420 |
| 428500 | Sep 29, 1994 | Sep 29, 1994 | Energas Company | City of Hale Center R.O.W. #C001HC | 560 | 18930418 |
| 428496 | Sep 29, 1994 | Sep 29, 1994 | Energas Company | City of Hale Center R.O.W. #C003HC | 560 | 18930421 |
| 418818 | Jan 19, 1994 | Jan 19, 1994 | Energas Company | City of Plainview R.O.W. #C020PL | 550 | 18930417 |
| 418816 | Jan 19, 1994 | Jan 19, 1994 | Energas Company | City of Plainview R.O.W. #C018PL | 540 | 18930415 |
| 418815 | Jan 19, 1994 | Jan 19, 1994 | Energas Company | Energas Company #C017PL | 550 | 18930414 |
| 418817 | Dec 21, 1993 | Dec 21, 1993 | Energas Company | City of Plainview R.O.W. #C019PL | 560 | 18930416 |
| 418398 | Nov 19, 1993 | Nov 19, 1993 | Amoco Production Company | Rice, C. A. #10 | 11,000 | 18930413 |
| 409776 | Mar 17, 1993 | Mar 17, 1993 | Chuza Operating | Terrell #1 | 6,000 | 18930412 |
| 406120 | Jan 14, 1993 | Jan 14, 1993 | Energas Company | City of Plainview R.O.W. #C016PL | 520 | 18930411 |
| 395371 | Jan 7, 1992 | Jan 7, 1992 | Amoco Production Company | Anton-Irish Clearfork Unit #74R | 6,100 | 18930410 |
| 373028 | May 18, 1990 | May 18, 1990 | Energas Company | City of Plainview Utility R.O.W. #C013PL | 530 | 18930409 |
| 360663 | Jun 29, 1989 | Jun 29, 1989 | Energas Company | City of Abernathy Utility R.O.W. #C001AB | 400 | 18930408 |
| 352691 | Oct 26, 1988 | Oct 26, 1988 | Siete Petroleum Corporation | Abernathy #1 | 11,000 | 18930407 |
| 345866 | May 2, 1988 | May 2, 1988 | Amoco Production Company | Anton Irish Clearfork Unit #531 | 6,100 | 18930406 |
| 344387 | Mar 24, 1988 | Mar 24, 1988 | Staley Operating Co. | Carmickle 'B' #4 | 4,950 | 18930405 |
| 329245 | May 14, 1987 | May 14, 1987 | Amoco Production Company | Anton Irish Clearfork Unit #529 | 6,200 | 18930404 |
| 329243 | May 14, 1987 | May 14, 1987 | Amoco Production Company | Anton Irish Clearfork Unit #528 | 6,200 | 18930403 |
| 329238 | May 14, 1987 | May 14, 1987 | Amoco Production Company | Anton Irish Clearfork Unit #530 | 6,200 | 18930402 |
| 324400 | Dec 15, 1986 | Dec 15, 1986 | Staley Operating Co. | Carmickle, E. M. B #3 | 4,803 | 18900032 |
| 322091 | Oct 22, 1986 | Oct 22, 1986 | Amoco Production Company | Williams, D. O. #8 | 8,850 | 18930323 |
| 295018 | Jan 3, 1986 | Jan 3, 1986 | Dawson Operating Co., Inc. | Autry #1 | 3,500 | 18930401 |
| 286965 | Oct 8, 1985 | Oct 8, 1985 | Bettis, Boyle & Stovall | Fisher #1 | 7,400 | 18930400 |