| 479479Amendment | Sep 16, 1998 | Sep 16, 1998 | Union Oil Company of California | Van Zandt | Crim, R. 28 #6 | 5,560 | 46731021 |
| 478176 | Jul 27, 1998 | Jul 27, 1998 | Union Oil Company of California | Reeves | Evans, N. T. #2 | 6,700 | 38900891 |
| 477049 | Jun 25, 1998 | Jun 25, 1998 | Union Oil Company of California | Andrews | Dollarhide Unit #1424CHH | 7,700 | 00333584 |
| 476982 | Jun 10, 1998 | Jun 10, 1998 | Union Oil Company of California | Andrews | Dollarhide Unit #1334CHH | 7,660 | 00336339 |
| 476956 | Jun 10, 1998 | Jun 10, 1998 | Union Oil Company of California | Andrews | Dollarhide Unit #135CHH | 7,700 | 00332277 |
| 476921 | Jun 9, 1998 | Jun 9, 1998 | Union Oil Company of California | Andrews | Dollarhide Unit #358E | 10,088 | 00304860 |
| 476294 | May 14, 1998 | May 14, 1998 | Union Oil Company of California | Jackson | Niebuhr, A. L. #11 | 6,420 | 23932497 |
| 476094 | May 7, 1998 | May 7, 1998 | Union Oil Company of California | Van Zandt | Maxfield, A. G. 38 #16 | 5,700 | 46731018 |
| 476056 | May 6, 1998 | May 6, 1998 | Union Oil Company of California | Van Zandt | York, Ella 102 #18 | 2,500 | 46731010 |
| 476055 | May 6, 1998 | May 6, 1998 | Union Oil Company of California | Van Zandt | Swain, W. F. 36 #13 | 2,500 | 46731011 |
| 476054 | May 6, 1998 | May 6, 1998 | Union Oil Company of California | Van Zandt | Taylor, J. T. 33 #11 | 2,500 | 46731012 |
| 476053 | May 6, 1998 | May 6, 1998 | Union Oil Company of California | Van Zandt | Smith, L. A. 103 #14 | 2,500 | 46731013 |
| 476052 | May 6, 1998 | May 6, 1998 | Union Oil Company of California | Van Zandt | Cumbie, J. 32 #8 | 2,500 | 46731014 |
| 476051 | May 6, 1998 | May 6, 1998 | Union Oil Company of California | Van Zandt | Jarman, W. T. 37 #28 | 5,750 | 46731015 |
| 476050 | May 6, 1998 | May 6, 1998 | Union Oil Company of California | Van Zandt | Jarman, W. T. 37 #27 | 5,750 | 46731016 |
| 476050Amendment | May 6, 1998 | May 6, 1998 | Union Oil Company of California | Van Zandt | Jarman, W. T. 37 #27 | 5,750 | 46731016 |
| 476049 | May 6, 1998 | May 6, 1998 | Union Oil Company of California | Van Zandt | Maxfield, A. G. 38 #17 | 5,700 | 46731017 |
| 476049Amendment | May 6, 1998 | May 6, 1998 | Union Oil Company of California | Van Zandt | Maxfield, A. G. 38 #17 | 5,750 | 46731017 |
| 475999 | May 6, 1998 | May 6, 1998 | Union Oil Company of California | Winkler | E. W. Cowden Unit #2 | 9,060 | 49530453 |
| 475589 | Apr 29, 1998 | Apr 29, 1998 | Union Oil Company of California | Gaines | North Riley Unit #164 | 7,350 | 16535356 |
| 475588 | Apr 29, 1998 | Apr 29, 1998 | Union Oil Company of California | Gaines | North Riley Unit #169 | 7,350 | 16535353 |
| 475587 | Apr 29, 1998 | Apr 29, 1998 | Union Oil Company of California | Gaines | North Riley Unit #170 | 7,350 | 16535354 |
| 475586 | Apr 29, 1998 | Apr 29, 1998 | Union Oil Company of California | Gaines | North Riley Unit #171 | 7,350 | 16535355 |
| 475408 | Apr 20, 1998 | Apr 20, 1998 | Union Oil Company of California | Andrews | Cowden, E. P. "A" #83 | 2,850 | 00304902 |
| 474689 | Apr 20, 1998 | Apr 20, 1998 | Union Oil Company of California | Van Zandt | Brawner, L. M. 10 #22 | 5,200 | 46731006 |
| 474688 | Apr 20, 1998 | Apr 20, 1998 | Union Oil Company of California | Van Zandt | Brawner, L. M. 10 #23 | 5,200 | 46731005 |
| 475435Amendment | Apr 17, 1998 | Apr 17, 1998 | Union Oil Company of California | Pecos | Trees Estate "12" #1 | 4,900 | 37136829 |
| 475193 | Apr 9, 1998 | Apr 9, 1998 | Union Oil Company of California | Van Zandt | Murphree J. J. 31 #13 | 5,300 | 46731008 |
| 475099 | Apr 7, 1998 | Apr 7, 1998 | Union Oil Company of California | Matagorda | E. O. Hansen et al Unit #1 | 13,450 | 32130910 |
| 475099Amendment | Apr 7, 1998 | Apr 7, 1998 | Union Oil Company of California | Matagorda | E. O. Hansen et al Unit #1 | 13,450 | 32130910 |
| 474778 | Mar 26, 1998 | Mar 26, 1998 | Union Oil Company of California | Crockett | Mitchell "107" #1 | 14,750 | 10538111 |
| 474690 | Mar 24, 1998 | Mar 24, 1998 | Union Oil Company of California | Van Zandt | Peters, R. H. 29 #9 | 5,700 | 46731007 |
| 474690Amendment | Mar 24, 1998 | Mar 24, 1998 | Union Oil Company of California | Van Zandt | Peters, R. H. 29 #9 | 5,718 | 46731007 |
| 474607 | Mar 20, 1998 | Mar 20, 1998 | Union Oil Company of California | Van Zandt | Crim, J. F. 16 #10 | 5,100 | 46731004 |
| 474606 | Mar 20, 1998 | Mar 20, 1998 | Union Oil Company of California | Van Zandt | Jarman, W. T. 37 #26 | 5,700 | 46731003 |
| 474606Amendment | Mar 20, 1998 | Mar 20, 1998 | Union Oil Company of California | Van Zandt | Jarman, W. T. 37 #26 | 5,700 | 46731003 |
| 473777 | Mar 10, 1998 | Mar 10, 1998 | Union Oil Company of California | Andrews | Dollarhide Unit #4708DH | 8,960 | 00334311 |
| 473776 | Mar 10, 1998 | Mar 10, 1998 | Union Oil Company of California | Andrews | Dollarhide Unit #706DH | 8,700 | 00336335 |
| 474034 | Mar 4, 1998 | Mar 4, 1998 | Union Oil Company of California | Van Zandt | Maxfield, A. G. 38 #15 | 5,750 | 46731002 |
| 473958 | Mar 3, 1998 | Mar 3, 1998 | Union Oil Company of California | Van Zandt | Crim, B. E. 15 #7 | 4,970 | 46731001 |
| 473419 | Mar 2, 1998 | Mar 2, 1998 | Union Oil Company of California | Van Zandt | Brawner, L. M. 10 #21 | 5,150 | 46731000 |
| 473768 | Feb 26, 1998 | Feb 26, 1998 | Union Oil Company of California | Andrews | Dollarhide Unit #4606DH | 9,085 | 00334574 |
| 473344 | Feb 17, 1998 | Feb 17, 1998 | Union Oil Company of California | Andrews | Dollarhide Unit #802DH | 8,700 | 00336386 |
| 472593 | Feb 17, 1998 | Feb 17, 1998 | Union Oil Company of California | Reeves | Evans, N. T. #10 | 16,800 | 38932145 |
| 472593Amendment | Feb 17, 1998 | Feb 17, 1998 | Union Oil Company of California | Reeves | Evans, N. T. #10 | 14,500 | 38932145 |
| 473046 | Feb 13, 1998 | Feb 13, 1998 | Union Oil Company of California | Gaines | North Riley Unit #1090 | 7,300 | 16535329 |
| 473045 | Feb 13, 1998 | Feb 13, 1998 | Union Oil Company of California | Gaines | North Riley Unit #1091 | 7,300 | 16535328 |
| 473044 | Feb 13, 1998 | Feb 13, 1998 | Union Oil Company of California | Gaines | North Riley Unit #1291 | 7,300 | 16535327 |
| 473044Amendment | Feb 13, 1998 | Feb 13, 1998 | Union Oil Company of California | Gaines | North Riley Unit #1291 | 7,820 | 16535327 |
| 472939 | Feb 6, 1998 | Feb 6, 1998 | Union Oil Company of California | Ector | Holt, O. B. "C" #1801 | 12,900 | 13537601 |
| 472830 | Jan 30, 1998 | Jan 30, 1998 | Union Oil Company of California | Van Zandt | Jarman, W. T. 37 #25 | 5,700 | 46730999 |
| 472830Amendment | Jan 30, 1998 | Jan 30, 1998 | Union Oil Company of California | Van Zandt | Jarmen, W. T. 37 #25 | 5,700 | 46730999 |
| 472782 | Jan 29, 1998 | Jan 29, 1998 | Union Oil Company of California | Van Zandt | Maxfield, A. G. 38 #14 | 5,700 | 46730998 |
| 472781 | Jan 29, 1998 | Jan 29, 1998 | Union Oil Company of California | Matagorda | E. O. Hansen et al Unit #1 | 13,450 | 32130910 |
| 472655 | Jan 26, 1998 | Jan 26, 1998 | Union Oil Company of California | Andrews | Parker Unit #8418ER | 9,300 | 00338363 |
| 472652 | Jan 26, 1998 | Jan 26, 1998 | Union Oil Company of California | Andrews | Dollarhide Unit #1301DH | 8,764 | 00336399 |
| 472303 | Jan 16, 1998 | Jan 16, 1998 | Union Oil Company of California | Van Zandt | Crim, B. E. 15 #6 | 5,300 | 46730996 |
| 472303Amendment | Jan 16, 1998 | Jan 16, 1998 | Union Oil Company of California | Van Zandt | Crim, B. E. 15 #6 | 5,300 | 46730996 |
| 472302 | Jan 16, 1998 | Jan 16, 1998 | Union Oil Company of California | Van Zandt | Crim, J. F. 16 #9 | 5,200 | 46730997 |
| 472278 | Jan 15, 1998 | Jan 15, 1998 | Union Oil Company of California | Orange | Johnson, Sid #1 | 9,215 | 36130733 |
| 471970 | Jan 13, 1998 | Jan 13, 1998 | Union Oil Company of California | Andrews | Southwest Andrews Unit #5101A | 9,300 | 00338354 |
| 471969 | Jan 13, 1998 | Jan 13, 1998 | Union Oil Company of California | Andrews | Southwest Andrews Unit #5301A | 9,300 | 00338353 |
| 471968 | Jan 13, 1998 | Jan 13, 1998 | Union Oil Company of California | Andrews | Southwest Andrews Unit #7301A | 9,300 | 00338352 |
| 471967 | Jan 13, 1998 | Jan 13, 1998 | Union Oil Company of California | Andrews | Southwest Andrews Unit #3101A | 9,300 | 00338349 |
| 471965 | Jan 13, 1998 | Jan 13, 1998 | Union Oil Company of California | Andrews | Southwest Andrews Unit #7718N | 9,300 | 00338351 |
| 471964 | Jan 13, 1998 | Jan 13, 1998 | Union Oil Company of California | Andrews | Southwest Andrews Unit #7101A | 9,300 | 00338350 |
| 471902 | Jan 12, 1998 | Jan 12, 1998 | Union Oil Company of California | Andrews | Dollarhide Unit #3601D | 8,500 | 00303543 |
| 471339 | Dec 30, 1997 | Dec 30, 1997 | Union Oil Company of California | Andrews | Southwest Andrews Unit #5718N | 9,300 | 00338340 |
| 471338 | Dec 30, 1997 | Dec 30, 1997 | Union Oil Company of California | Andrews | Southwest Andrews Unit #5518N | 9,300 | 00338339 |
| 471336 | Dec 30, 1997 | Dec 30, 1997 | Union Oil Company of California | Andrews | Southwest Andrews Unit #3718N | 9,300 | 00338338 |
| 471335 | Dec 30, 1997 | Dec 30, 1997 | Union Oil Company of California | Andrews | Southwest Andrews Unit #7518N | 9,300 | 00338337 |
| 470399 | Dec 2, 1997 | Dec 2, 1997 | Union Oil Company of California | Ector | Toad "A" #23 | 4,100 | 13536642 |
| 470133 | Nov 18, 1997 | Nov 18, 1997 | Union Oil Company of California | Andrews | Southwest Andrews Unit #3318N | 9,300 | 00338326 |
| 470132 | Nov 18, 1997 | Nov 18, 1997 | Union Oil Company of California | Andrews | Southwest Andrews Unit #5318N | 9,300 | 00338327 |
| 470171 | Nov 17, 1997 | Nov 17, 1997 | Union Oil Company of California | Jackson | Mauritz, T. N. #9 | 6,416 | 23932293 |
| 469928 | Nov 10, 1997 | Nov 10, 1997 | Union Oil Company of California | Van Zandt | Brawner, L.M. 10 #20 | 5,600 | 46730994 |
| 469928Amendment | Nov 10, 1997 | Nov 10, 1997 | Union Oil Company of California | Van Zandt | Brawner, L. M. 10 #20 | 5,600 | 46730994 |
| 469927 | Nov 10, 1997 | Nov 10, 1997 | Union Oil Company of California | Van Zandt | Leonard, J. H. 30 #6 | 5,700 | 46730993 |
| 469927Amendment | Nov 10, 1997 | Nov 10, 1997 | Union Oil Company of California | Van Zandt | Leonard, J. H. 30 #6 | 5,700 | 46730993 |
| 469926 | Nov 10, 1997 | Nov 10, 1997 | Union Oil Company of California | Van Zandt | Swain, W.F. 14 #6 | 5,300 | 46730992 |
| 469925 | Nov 10, 1997 | Nov 10, 1997 | Union Oil Company of California | Van Zandt | Peters, R.H. 29 #8 | 9,000 | 46730991 |
| 469925Amendment | Nov 10, 1997 | Nov 10, 1997 | Union Oil Company of California | Van Zandt | Peters, R. H. 29 #8 | 9,000 | 46730991 |
| 469925Amendment | Nov 10, 1997 | Nov 10, 1997 | Union Oil Company of California | Van Zandt | Peters, R. H. 29 #8 | 9,000 | 46730991 |
| 469661 | Nov 4, 1997 | Nov 4, 1997 | Union Oil Company of California | Orange | Manuel Heirs #1 | 8,752 | 36130747 |
| 469661Amendment | Nov 4, 1997 | Nov 4, 1997 | Union Oil Company of California | Orange | Manuel Heirs #1 | 8,752 | 36130747 |
| 469661Amendment | Nov 4, 1997 | Nov 4, 1997 | Union Oil Company of California | Orange | Manuel Heirs #1 | 8,752 | 36130747 |
| 469661Amendment | Nov 4, 1997 | Nov 4, 1997 | Union Oil Company of California | Orange | Manuel Heirs #1 | 8,752 | 36130747 |
| 469311 | Oct 28, 1997 | Oct 28, 1997 | Union Oil Company of California | Reeves | Anthony, H. F. #6 | 16,000 | 38930410 |
| 469212 | Oct 24, 1997 | Oct 24, 1997 | Union Oil Company of California | Borden | Reinecke Unit #254 | 7,000 | 03331466 |
| 469110 | Oct 22, 1997 | Oct 22, 1997 | Union Oil Company of California | Van Zandt | Brawner, L. M. 10 #19 | 5,200 | 46730990 |
| 468110 | Oct 13, 1997 | Oct 13, 1997 | Union Oil Company of California | Gaines | Blackwatch San Andres Unit #202 | 4,750 | 16535277 |
| 468356 | Oct 8, 1997 | Oct 8, 1997 | Union Oil Company of California | Gaines | Blackwatch (San Andres) Unit #214 | 4,750 | 16535285 |
| 468355 | Oct 8, 1997 | Oct 8, 1997 | Union Oil Company of California | Gaines | Blackwatch (San Andres) Unit #213 | 4,750 | 16535288 |
| 468354 | Oct 8, 1997 | Oct 8, 1997 | Union Oil Company of California | Gaines | Blackwatch (San Andres) Unit #211 | 4,750 | 16535287 |
| 468353 | Oct 8, 1997 | Oct 8, 1997 | Union Oil Company of California | Gaines | Blackwatch (San Andres) Unit #203 | 4,750 | 16535286 |
| 468109 | Oct 8, 1997 | Oct 8, 1997 | Union Oil Company of California | Gaines | Blackwatch San Andres Unit #201 | 4,750 | 16535278 |
| 468111 | Oct 3, 1997 | Oct 3, 1997 | Union Oil Company of California | Gaines | Blackwatch San Andres Unit #212 | 4,750 | 16535276 |
| 468285 | Oct 1, 1997 | Oct 1, 1997 | Union Oil Company of California | Van Zandt | Jarman, W. T. 37 #24 | 5,800 | 46730987 |
| 468285Amendment | Oct 1, 1997 | Oct 1, 1997 | Union Oil Company of California | Van Zandt | Jarman, W. T. 37 #24 | 5,800 | 46730987 |
| 468161 | Sep 29, 1997 | Sep 29, 1997 | Union Oil Company of California | Orange | Bilbo Heirs #1 | 8,600 | 36130747 |