| 492919 | Mar 14, 2000 | Mar 14, 2000 | Union Oil Company of California | Winkler | Keystone Gsu #3D | 5,100 | 49532780 |
| 492918 | Mar 14, 2000 | Mar 14, 2000 | Union Oil Company of California | Winkler | Keystone Gsu #2 | 2,900 | 49532779 |
| 492917 | Mar 14, 2000 | Mar 14, 2000 | Union Oil Company of California | Winkler | Keystone Gsu #1 | 2,900 | 49532778 |
| 492640 | Mar 6, 2000 | Mar 6, 2000 | Union Oil Company of California | Gaines | North Riley Unit #1305 | 7,400 | 16535500 |
| 492495 | Feb 29, 2000 | Feb 29, 2000 | Union Oil Company of California | Van Zandt | Smith, L. A. 103 #7 | 2,500 | 46730147 |
| 492159 | Feb 23, 2000 | Feb 23, 2000 | Union Oil Company of California | Andrews | Cowden, E. P. "B" #3BR | 2,200 | 00384717 |
| 491704 | Feb 18, 2000 | Feb 18, 2000 | Union Oil Company of California | Reeves | Anthony, H. F. #12 | 6,900 | 38932182 |
| 492175 | Feb 17, 2000 | Feb 17, 2000 | Union Oil Company of California | Gaines | North Riley Unit #1289 | 7,400 | 16535497 |
| 492174 | Feb 17, 2000 | Feb 17, 2000 | Union Oil Company of California | Gaines | North Riley Unit #1313 | 7,400 | 16535498 |
| 492173 | Feb 17, 2000 | Feb 17, 2000 | Union Oil Company of California | Gaines | North Riley Unit #1293 | 7,400 | 16535496 |
| 491489 | Feb 9, 2000 | Feb 9, 2000 | Union Oil Company of California | Pecos | Price, Aubrey #3H | 17,500 | 37136979 |
| 491705 | Feb 4, 2000 | Feb 4, 2000 | Union Oil Company of California | Andrews | Parker Unit #2211A | 9,700 | 00338571 |
| 491703 | Feb 4, 2000 | Feb 4, 2000 | Union Oil Company of California | Reeves | Evans, N. T. #11 | 6,900 | 38932181 |
| 491702 | Feb 4, 2000 | Feb 4, 2000 | Union Oil Company of California | Andrews | Cowden, E. P. "A-25" #102 | 2,970 | 00304919 |
| 491660 | Feb 2, 2000 | Feb 2, 2000 | Union Oil Company of California | Van Zandt | Thompson, I. W. 401 #6 | 2,600 | 46700618 |
| 491435 | Jan 26, 2000 | Jan 26, 2000 | Union Oil Company of California | Gaines | North Riley Unit #1251 | 7,400 | 16535492 |
| 491434 | Jan 26, 2000 | Jan 26, 2000 | Union Oil Company of California | Gaines | North Riley Unit #1296 | 7,400 | 16535491 |
| 491433 | Jan 26, 2000 | Jan 26, 2000 | Union Oil Company of California | Gaines | North Riley Unit #1298 | 7,400 | 16535490 |
| 490583 | Jan 26, 2000 | Jan 26, 2000 | Union Oil Company of California | Pecos | W. C. Tyrrell Unit #1 #5 | 11,600 | 37136974 |
| 491329 | Jan 21, 2000 | Jan 21, 2000 | Union Oil Company of California | Van Zandt | Svrucu #2911 | 5,280 | 46731036 |
| 491329Amendment | Jan 21, 2000 | Jan 21, 2000 | Union Oil Company of California | Van Zandt | Svrucu #2911 | 5,280 | 46731036 |
| 491246 | Jan 21, 2000 | Jan 21, 2000 | Union Oil Company of California | Andrews | Brangus University #3 | 9,500 | 00338565 |
| 491245 | Jan 21, 2000 | Jan 21, 2000 | Union Oil Company of California | Andrews | Parker Unit #6212A | 9,600 | 00338564 |
| 490520 | Jan 21, 2000 | Jan 21, 2000 | Union Oil Company of California | Van Zandt | Brawner, L. M. 10 #25 | 5,255 | 46731034 |
| 491175 | Jan 18, 2000 | Jan 18, 2000 | Union Oil Company of California | Van Zandt | Swain, O. L. #11 #24 | 5,370 | 46731035 |
| 490760 | Dec 30, 1999 | Dec 30, 1999 | Union Oil Company of California | Ector | Conger #1701 | 13,900 | 13537788 |
| 490584 | Dec 23, 1999 | Dec 23, 1999 | Union Oil Company of California | Pecos | W. C. Tyrrell Unit #2 #3 | 11,600 | 37136973 |
| 490317 | Dec 13, 1999 | Dec 13, 1999 | Union Oil Company of California | Van Zandt | Smith, L. A. 103 #7 | 2,530 | 46730147 |
| 490316 | Dec 13, 1999 | Dec 13, 1999 | Union Oil Company of California | Van Zandt | Bracken, J. A. 503 #5 | 2,350 | 46700604 |
| 489154 | Nov 12, 1999 | Nov 12, 1999 | Union Oil Company of California | Van Zandt | Svrucu #3729 | 5,200 | 46731032 |
| 489390 | Nov 10, 1999 | Nov 10, 1999 | Union Oil Company of California | Van Zandt | Brawner, L. M. 10 #24 | 3,180 | 46731033 |
| 486744 | Oct 18, 1999 | Oct 18, 1999 | Union Oil Company of California | Van Zandt | Brawner, L. M. 10 #16 | 5,650 | 46730981 |
| 488249 | Oct 6, 1999 | Oct 6, 1999 | Union Oil Company of California | Van Zandt | Crim, R. 28 #7L | 5,350 | 46731025 |
| 488248 | Oct 6, 1999 | Oct 6, 1999 | Union Oil Company of California | Van Zandt | Crim, R. "28" #6L | 5,560 | 46731021 |
| 488040 | Sep 30, 1999 | Sep 30, 1999 | Union Oil Company of California | Gaines | North Riley Unit #1270 | 7,400 | 16535466 |
| 488039 | Sep 30, 1999 | Sep 30, 1999 | Union Oil Company of California | Gaines | North Riley Unit #1279 | 7,400 | 16535465 |
| 488039Amendment | Sep 30, 1999 | Sep 30, 1999 | Union Oil Company of California | Gaines | North Riley Unit #1279 | 7,400 | 16535465 |
| 487862 | Sep 30, 1999 | Sep 30, 1999 | Union Oil Company of California | Winkler | Keystone Gsu #1D | 5,100 | 49532770 |
| 487824 | Sep 24, 1999 | Sep 24, 1999 | Union Oil Company of California | Gaines | North Riley Unit #1294 | 7,400 | 16535463 |
| 487837 | Sep 22, 1999 | Sep 22, 1999 | Union Oil Company of California | Van Zandt | Bracken, J. A. 503 #10 | 2,465 | 46730752 |
| 487750 | Sep 21, 1999 | Sep 21, 1999 | Union Oil Company of California | Gaines | North Riley Unit #1299 | 7,400 | 16535461 |
| 487591 | Sep 20, 1999 | Sep 20, 1999 | Union Oil Company of California | Pecos | Trees Estate "12" #4 | 5,200 | 37136940 |
| 487590 | Sep 20, 1999 | Sep 20, 1999 | Union Oil Company of California | Pecos | Trees Estate "12" #3 | 5,200 | 37136941 |
| 487714 | Sep 17, 1999 | Sep 17, 1999 | Union Oil Company of California | Van Zandt | Jarman, W. T. 37 #27 | 4,980 | 46731016 |
| 487571 | Sep 15, 1999 | Sep 15, 1999 | Union Oil Company of California | Gaines | North Riley Unit #1301 | 7,400 | 16535459 |
| 487162 | Sep 8, 1999 | Sep 8, 1999 | Union Oil Company of California | Pecos | Trees Estate "18" #1 | 5,200 | 37136939 |
| 487162Amendment | Sep 8, 1999 | Sep 8, 1999 | Union Oil Company of California | Pecos | State-Trees "18" #1 | 5,339 | 37136939 |
| 486887 | Aug 26, 1999 | Aug 26, 1999 | Union Oil Company of California | Borden | Reinecke Unit #277 | 7,036 | 03331250 |
| 486886 | Aug 26, 1999 | Aug 26, 1999 | Union Oil Company of California | Borden | Reinecke Unit #276 | 7,041 | 03331241 |
| 486885 | Aug 26, 1999 | Aug 26, 1999 | Union Oil Company of California | Borden | Reinecke Unit #268 | 7,035 | 03331274 |
| 486878 | Aug 26, 1999 | Aug 26, 1999 | Union Oil Company of California | Borden | Reinecke Unit #255 | 7,041 | 03331382 |
| 486902 | Aug 25, 1999 | Aug 25, 1999 | Union Oil Company of California | Gaines | North Riley Unit #4 | 7,400 | 16535456 |
| 486488 | Aug 9, 1999 | Aug 9, 1999 | Union Oil Company of California | Gaines | Doss-Yates #1 | 3,200 | 16535440 |
| 486437 | Aug 5, 1999 | Aug 5, 1999 | Union Oil Company of California | Van Zandt | Jarman, W. T. 37 #24L | 5,760 | 46730987 |
| 486436 | Aug 5, 1999 | Aug 5, 1999 | Union Oil Company of California | Van Zandt | Ray, S. R. #1 | 7,263 | 46730914 |
| 486276 | Aug 2, 1999 | Aug 2, 1999 | Union Oil Company of California | Van Zandt | Maxfield, A. G. 38 #16 | 4,912 | 46731018 |
| 485712 | Jul 12, 1999 | Jul 12, 1999 | Union Oil Company of California | Pecos | W. C. Tyrrell Unit #1 #4 | 12,500 | 37136923 |
| 485383 | Jun 22, 1999 | Jun 22, 1999 | Union Oil Company of California | Van Zandt | Ray, S. R. #1 | 7,263 | 46730914 |
| 485383Amendment | Jun 22, 1999 | Jun 22, 1999 | Union Oil Company of California | Van Zandt | Ray, S. R. #1 | 7,263 | 46730914 |
| 484938 | Jun 7, 1999 | Jun 7, 1999 | Union Oil Company of California | Gaines | North Riley Unit #372 | 7,350 | 16535426 |
| 484938Amendment | Jun 7, 1999 | Jun 7, 1999 | Union Oil Company of California | Gaines | North Riley Unit #372 | 7,350 | 16535426 |
| 484937 | Jun 7, 1999 | Jun 7, 1999 | Union Oil Company of California | Gaines | North Riley Unit #1295 | 7,350 | 16535425 |
| 484530 | May 17, 1999 | May 17, 1999 | Union Oil Company of California | Andrews | Perkins #2 | 10,174 | 00337742 |
| 484471 | May 17, 1999 | May 17, 1999 | Union Oil Company of California | Gaines | North Riley Unit #365 | 7,350 | 16535423 |
| 484470 | May 17, 1999 | May 17, 1999 | Union Oil Company of California | Gaines | North Riley Unit #356 | 7,350 | 16535422 |
| 484469 | May 17, 1999 | May 17, 1999 | Union Oil Company of California | Gaines | North Riley Unit #364 | 7,350 | 16535421 |
| 484468 | May 17, 1999 | May 17, 1999 | Union Oil Company of California | Gaines | North Riley Unit #156 | 7,350 | 16535420 |
| 484467 | May 17, 1999 | May 17, 1999 | Union Oil Company of California | Gaines | North Riley Unit #163 | 7,350 | 16535419 |
| 484466 | May 17, 1999 | May 17, 1999 | Union Oil Company of California | Gaines | North Riley Unit #363 | 7,350 | 16535418 |
| 483733 | Apr 9, 1999 | Apr 9, 1999 | Union Oil Company of California | Pecos | Trees Estate "12" #2 | 6,400 | 37136908 |
| 483733Amendment | Apr 9, 1999 | Apr 9, 1999 | Union Oil Company of California | Pecos | Trees Estate "12" #2 | 6,400 | 37136908 |
| 483378 | Mar 19, 1999 | Mar 19, 1999 | Union Oil Company of California | Van Zandt | Murphree J. J. 31 #15 | 5,400 | 46731028 |
| 483378Amendment | Mar 19, 1999 | Mar 19, 1999 | Union Oil Company of California | Van Zandt | Murphree, J. J. 31 #15 | 5,400 | 46731028 |
| 483377 | Mar 19, 1999 | Mar 19, 1999 | Union Oil Company of California | Van Zandt | Central Van Woodbine Unit #5011D | 3,000 | 46731029 |
| 483279 | Mar 17, 1999 | Mar 17, 1999 | Union Oil Company of California | Pecos | W. C. Tyrrell Unit No. 2 #2 | 17,200 | 37136902 |
| 482941 | Feb 25, 1999 | Feb 25, 1999 | Union Oil Company of California | Van Zandt | Peters, R. 29 #10 | 5,350 | 46731027 |
| 482897 | Feb 25, 1999 | Feb 25, 1999 | Union Oil Company of California | Crockett | Marley, Jess #4 | 11,350 | 10538244 |
| 482896 | Feb 25, 1999 | Feb 25, 1999 | Union Oil Company of California | Crockett | Marley, Jess #3 | 11,350 | 10538243 |
| 482752 | Feb 18, 1999 | Feb 18, 1999 | Union Oil Company of California | Crockett | Wayne West Ranch "AB" #1 | 11,400 | 10538242 |
| 482666 | Feb 15, 1999 | Feb 15, 1999 | Union Oil Company of California | Brazos-LB | S/L 098725 #1 | 14,200 | 70430324 |
| 482637 | Feb 10, 1999 | Feb 10, 1999 | Union Oil Company of California | Van Zandt | White 501 #12 | 5,700 | 46731026 |
| 482637Amendment | Feb 10, 1999 | Feb 10, 1999 | Union Oil Company of California | Van Zandt | White, W. H. 501 #12 | 5,785 | 46731026 |
| 482047 | Feb 8, 1999 | Feb 8, 1999 | Union Oil Company of California | Pecos | P.B.M. Unit #2 | 17,200 | 37136898 |
| 482024 | Jan 14, 1999 | Jan 14, 1999 | Union Oil Company of California | Andrews | Cowden, E. P. "A-26" #23 | 2,950 | 00304956 |
| 481888 | Jan 6, 1999 | Jan 6, 1999 | Union Oil Company of California | Pecos | P. B. M. Unit #2 | 17,200 | 37136898 |
| 481676 | Dec 28, 1998 | Dec 28, 1998 | Union Oil Company of California | Borden | Reinecke Unit #86 | 7,030 | 03300439 |
| 481422 | Dec 11, 1998 | Dec 11, 1998 | Union Oil Company of California | Van Zandt | Crim, R. 28 #7 | 5,350 | 46731025 |
| 480844 | Nov 18, 1998 | Nov 18, 1998 | Union Oil Company of California | Reeves | Anthony, H. F. #9 | 5,650 | 38932097 |
| 480844Amendment | Nov 18, 1998 | Nov 18, 1998 | Union Oil Company of California | Reeves | Anthony, H. F. #9 | 5,300 | 38932097 |
| 480844Amendment | Nov 18, 1998 | Nov 18, 1998 | Union Oil Company of California | Reeves | Anthony, H. F. #9 | 5,300 | 38932097 |
| 480820 | Nov 17, 1998 | Nov 17, 1998 | Union Oil Company of California | Winkler | E. W. Cowden Unit #1 | 7,500 | 49503499 |
| 480899 | Nov 16, 1998 | Nov 16, 1998 | Union Oil Company of California | Van Zandt | Swain, W. 9 #14 | 5,500 | 46731024 |
| 480899Amendment | Nov 16, 1998 | Nov 16, 1998 | Union Oil Company of California | Van Zandt | Swain, W. "9" #14 | 5,500 | 46731024 |
| 480386 | Oct 22, 1998 | Oct 22, 1998 | Union Oil Company of California | Van Zandt | Swain, W. 14 #8 | 5,300 | 46731023 |
| 480277 | Oct 22, 1998 | Oct 22, 1998 | Union Oil Company of California | Andrews | Cowden, E. P. "AA" #6 | 2,800 | 00304827 |
| 479797 | Sep 30, 1998 | Sep 30, 1998 | Union Oil Company of California | Van Zandt | Murphree, J. 31 #14 | 5,750 | 46731022 |
| 479797Amendment | Sep 30, 1998 | Sep 30, 1998 | Union Oil Company of California | Van Zandt | Murphree, J. 31 #14 | 5,750 | 46731022 |
| 479797Amendment | Sep 30, 1998 | Sep 30, 1998 | Union Oil Company of California | Van Zandt | Murphree, J. J. 31 #14 | 5,750 | 46731022 |
| 479471 | Sep 17, 1998 | Sep 17, 1998 | Union Oil Company of California | Howard | Chalk, Otis #34WS | 5,200 | 22730474 |
| 479479 | Sep 16, 1998 | Sep 16, 1998 | Union Oil Company of California | Van Zandt | Crim, R. 28 #6 | 5,550 | 46731021 |