| Headlee E. V. TG #442-135-06592 | Four Star Oil and Gas Company only | EctorHeadlee (Ellenburger) | PluggedOil | 13,299 | Mar 12, 1987 | 1 | May 1998 |
| Cowden Ranch-18. #342-135-35504 | Rust Oil Corp. only | EctorWildcat | PluggedOil | 9,000 | Mar 11, 1987 | 1 | — |
| South Foster Unit #181W42-135-35496 | Occidental Permian Ltd. only | EctorFoster | PluggedOil | 4,800 | Mar 10, 1987 | 1 | Aug 2026 |
| South Foster Unit #182W42-135-35497 | Occidental Permian Ltd. only | EctorFoster | ActiveInjection | 4,570 | Mar 10, 1987 | 1 | Aug 2026 |
| South Cowden Canyon Unit #2242-135-35442 | OXY USA Inc. only | EctorCowden South (Canyon 8900) | Shut inOil | 9,150 | Mar 4, 1987 | 1 | Aug 2026 |
| Texaco-Moore 11 #1__42-135-35393 | Rust Oil Corp.permitted by · no operator of record | Ector | Plugged | 8,500 | Mar 3, 1987 | 1 | — |
| Cowden -31- #142-135-35484 | Bustamante Resources LLC only | EctorCowden (Cisco) | PluggedOil | 9,300 | Mar 3, 1987 | 1 | Aug 2026 |
| Jennifer (Queen) Unit #1942-135-35499 | Richland Resources Corporation only | EctorConcho Bluff North (Queen) | ActiveOil | 4,601 | Mar 3, 1987 | 1 | Jul 2026 |
| Jennifer (Queen) Unit #31WI42-135-35500 | Richland Resources Corporation only | EctorConcho Bluff North (Queen) | Shut inOil | 4,620 | Mar 3, 1987 | 1 | Jul 2026 |
| North Cowden Unit #122742-135-35460 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,550 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #122842-135-35461 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,600 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #121242-135-35470 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,559 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #121342-135-35471 | Occidental Permian Ltd. only | EctorCowden North | PluggedOil | 5,000 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #121442-135-35472 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,600 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #121742-135-35473 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,550 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #121842-135-35474 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,600 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #121942-135-35475 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,605 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #122242-135-35476 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,550 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #125342-135-35485 | Occidental Permian Ltd. only | EctorCowden North | PluggedOil | 4,900 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #126042-135-35486 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,550 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #127042-135-35487 | Occidental Permian Ltd. only | EctorCowden North | Shut inOil | 4,465 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #125242-135-35488 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,432 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #124742-135-35489 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,600 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #124542-135-35490 | Occidental Permian Ltd. only | EctorCowden North | Shut inOil | 4,550 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #123842-135-35491 | Occidental Permian Ltd. only | EctorCowden North | Shut inOil | 4,550 | Mar 2, 1987 | 1 | Aug 2026 |
| North Cowden Unit #1206W42-135-35458 | Occidental Permian Ltd. only | EctorCowden North | ActiveInjection | 4,445 | Feb 25, 1987 | 1 | Aug 2026 |
| Amoco-Cowden -9- #242-135-35483 | Jay Management Company LLC only | EctorGoldsmith N. (San Andres Con.) | ActiveOil | 5,870 | Feb 25, 1987 | 1 | Aug 2026 |
| North Cowden Unit #1207W42-135-35462 | Occidental Permian Ltd. only | EctorCowden North | ActiveInjection | 4,518 | Feb 24, 1987 | 1 | Aug 2026 |
| North Cowden Unit #1210W42-135-35463 | Occidental Permian Ltd. only | EctorCowden North | PluggedOil | 4,855 | Feb 24, 1987 | 1 | Aug 2026 |
| North Cowden Unit #1211W42-135-35464 | Occidental Permian Ltd. only | EctorCowden North | ActiveInjection | 4,510 | Feb 24, 1987 | 1 | Aug 2026 |
| North Cowden Unit #1216W42-135-35465 | Occidental Permian Ltd. only | EctorCowden North | ActiveInjection | 4,515 | Feb 24, 1987 | 1 | Aug 2026 |
| North Cowden Unit #1220W42-135-35466 | Occidental Permian Ltd. only | EctorCowden North | ActiveInjection | 4,467 | Feb 24, 1987 | 1 | Aug 2026 |
| North Cowden Unit #1221W42-135-35467 | Occidental Permian Ltd. only | EctorCowden North | ActiveInjection | 4,517 | Feb 24, 1987 | 1 | Aug 2026 |
| Penwell Unit #137542-135-01382 | Ctoc Energy LLC only | EctorPenwell | Shut inOil | 9,065 | Feb 23, 1987 | 2 | Aug 2026 |
| North Cowden Unit #128542-135-35433 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,508 | Feb 23, 1987 | 1 | Aug 2026 |
| North Cowden Unit #127942-135-35434 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,410 | Feb 23, 1987 | 1 | Aug 2026 |
| North Cowden Unit #123942-135-35478 | Occidental Permian Ltd. only | EctorCowden North | PluggedOil | 5,000 | Feb 23, 1987 | 1 | Aug 2026 |
| North Cowden Unit #127242-135-35479 | Occidental Permian Ltd. only | EctorCowden North | Shut inOil | 4,538 | Feb 23, 1987 | 1 | Aug 2026 |
| North Cowden Unit #125842-135-35480 | Occidental Permian Ltd. only | EctorCowden North | Shut inOil | 4,407 | Feb 23, 1987 | 1 | Aug 2026 |
| North Cowden Unit #128042-135-35481 | Occidental Permian Ltd. only | EctorCowden North | PluggedOil | 4,810 | Feb 23, 1987 | 1 | Aug 2026 |
| North Cowden Unit #127342-135-35482 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,560 | Feb 23, 1987 | 1 | Aug 2026 |
| Johnson J.L. 38 #5W42-135-35844 | Aghorn Operating Inc. only | EctorJohnson (Holt) | ActiveInjection | 5,405 | Feb 22, 1987 | 1 | Jun 2026 |
| David Fasken -CF- #342-135-34423 | Fasken Oil and Ranch Ltd. only | EctorFasken (Penn.) | PluggedOil | 10,900 | Feb 19, 1987 | 2 | Feb 2025 |
| Rhodes Cowden Unit #460W42-135-35403 | OXY USA WTP LP only | EctorCowden North | ActiveInjection | 4,351 | Feb 19, 1987 | 1 | Aug 2026 |
| Rhodes Cowden Unit #31342-135-35405 | OXY USA WTP LP only | EctorCowden North | PluggedOil | 4,350 | Feb 19, 1987 | 1 | Aug 2026 |
| Rhodes Cowden Unit #67542-135-35409 | OXY USA WTP LP only | EctorCowden North | Shut inOil | 4,352 | Feb 19, 1987 | 1 | Aug 2026 |
| North Cowden Unit #126242-135-35413 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,575 | Feb 19, 1987 | 1 | Aug 2026 |
| North Cowden Unit #126142-135-35416 | Occidental Permian Ltd. only | EctorCowden North | ActiveOil | 4,467 | Feb 19, 1987 | 1 | Aug 2026 |
| North Cowden Unit #124842-135-35418 | Occidental Permian Ltd. only | EctorCowden North | Shut inOil | 4,600 | Feb 19, 1987 | 1 | Aug 2026 |
| North Cowden Unit #124642-135-35420 | Occidental Permian Ltd. only | EctorCowden North | Shut inOil | 4,550 | Feb 19, 1987 | 1 | Aug 2026 |