| East Harper Unit O-10-19904 | Aghorn Operating, Inc. only | Harper | Ector | 266 | 2.95M | 843K | Jan 1993 – Feb 2026 |
| Harper Devonian Unit O-10-20609 | OXY USA WTP EOR, LLC only | Harper (Devonian) | Ector | 42 | 2.33M | 16M | Jan 1993 – Apr 2026 |
| Ector Fee Unit II O-10-21673 | Formentera Operations LLC only | Harper (Ellenburger) | Ector | 3 | 726K | 733K | Jan 1993 – Apr 2026 |
| Moss -E- O-10-17665 | OXY USA WTP EOR, LLC only | Harper (Ellenburger) | Ector | 7 | 601K | 601K | Jan 1993 – Apr 2026 |
| Moss O-10-2470 | Walsh & Watts, Inc. only | Harper | Ector | 27 | 601K | 238K | Jan 1993 – Apr 2026 |
| Cowden -13- O-10-31983 | Aghorn Operating, Inc. only | Harper (Glorieta) | Ector | 9 | 600K | 210K | Jan 1993 – Feb 2026 |
| TXL -A- O-10-2472 | Walsh & Watts, Inc. only | Harper | Ector | 11 | 476K | 98.9K | Jan 1993 – Apr 2026 |
| Parker -D- O-10-2471 | Walsh & Watts, Inc. only | Harper | Ector | 17 | 452K | 250K | Jan 1993 – Apr 2026 |
| Cowden -12- O-10-32108 | Aghorn Operating, Inc. only | Harper (Glorieta) | Ector | 10 | 378K | 164K | Jan 1993 – Feb 2026 |
| TXL -WW- O-10-17917 | Burleson Petroleum, Inc. only | Harper (Ellenburger) | Ector | 1 | 366K | 313K | Jan 1993 – Apr 2026 |
| Moss O-10-17240 | Aghorn Operating, Inc. only | Harper (Ellenburger) | Ector | 4 | 357K | 422K | Jan 1993 – Feb 2026 |
| Fraser, Geo. C. O-10-18018 | Burleson Petroleum, Inc. only | Harper (Ellenburger) | Ector | 2 | 309K | 167K | Jan 1993 – Apr 2026 |
| TXL O-10-9280 | Burleson Petroleum, Inc. only | Harper | Ector | 5 | 253K | 125K | Jan 1993 – Apr 2026 |
| Cowden Ranch -6- O-10-32731 | Rust Oil Corp. only | Harper (Glorieta) | Ector | 1 | 197K | 23K | Jan 1993 – Apr 2026 |
| Wright -14- O-10-32230 | Aghorn Operating, Inc. only | Harper (Glorieta) | Ector | 2 | 195K | 28.6K | Jan 1993 – Feb 2026 |
| Parker, J. E. O-10-8549 | Shinnery Oil Company, Inc. only | Harper | Ector | 9 | 176K | 68.6K | Jan 1993 – Apr 2026 |
| Fraser, George C. "B" O-10-36214 | Burleson Petroleum, Inc. only | Harper (Strawn) | Ector | 1 | 171K | 280K | Mar 2000 – Apr 2026 |
| Parker, J. E. O-10-2443 | Acoma Operating, LLC only | Harper | Ector | 22 | 167K | 132K | Jan 1993 – Apr 2026 |
| Ector Fee Unit O-10-34363 | Aghorn Operating, Inc. only | Harper (Fusselman) | Ector | 1 | 165K | 242K | Dec 1994 – Feb 2026 |
| Moss O-10-17241 | Aghorn Operating, Inc. only | Harper (Strawn) | Ector | 4 | 163K | 151K | Jan 1993 – Feb 2026 |
| W. E. Cowden O-10-27887 | Baker Operating, Inc. only | Harper | Ector | 9 | 156K | 57.6K | Jan 1993 – Apr 2026 |
| Cowden O-10-33431 | Petex only | Harper, W. (Pennsylvanian) | Ector | 2 | 151K | 128K | Jan 1993 – Apr 2026 |
| Parker "A" O-10-2468 | Walsh & Watts, Inc. only | Harper | Ector | 15 | 151K | 254K | Jan 1993 – Apr 2026 |
| Parker "B" O-10-2469 | Walsh & Watts, Inc. only | Harper | Ector | 13 | 123K | 129K | Jan 1993 – Apr 2026 |
| Ector -AR- Fee O-10-18196 | Pen-Tex Production Co. Inc. only | Harper | Ector | 18 | 115K | 81.9K | Jan 1993 – Apr 2026 |
| Parker "A" O-10-2459 | Acoma Operating, LLC only | Harper | Ector | 6 | 114K | 8.41K | Jan 1993 – Mar 2026 |
| Moss, Paul -C- O-10-11169 | Aghorn Operating, Inc. only | Harper | Ector | 32 | 106K | 51.3K | Jan 1993 – Feb 2026 |
| Parker O-10-27704 | Pen-Tex Production Co. Inc. only | Harper | Ector | 5 | 105K | 149K | Jan 1993 – Apr 2026 |
| Ector -E- Fee /NCT-2/ O-10-16998 | Formentera Operations LLC only | Harper | Ector | 6 | 104K | 62.4K | Jan 1993 – Apr 2026 |
| Cowden, E. F. -a- - -B- O-10-2453 | Aghorn Operating, Inc. only | Harper | Ector | 17 | 103K | 36.4K | Jan 1993 – Feb 2026 |
| TXL O-10-2460 | Walsh & Watts, Inc. only | Harper | Ector | 5 | 103K | 2.23K | Jan 1993 – Apr 2026 |
| Moss, Paul '34' O-10-2452 | Aghorn Operating, Inc. only | Harper | Ector | 14 | 102K | 1.44K | Jan 1993 – Feb 2026 |
| Ector -E- Fee NCT-2 O-10-17723 | Formentera Operations LLC only | Harper (Ellenburger) | Ector | 2 | 100K | 107K | Dec 1996 – Sep 2015 |
| Diamond Lil O-10-36719 | Hilcorp Energy Company only | Harper (Ellenburger) | Ector | 1 | 89.2K | 59.8K | Jul 2001 – Apr 2026 |
| Cowden-Oliver O-10-29350 | Baker Operating, Inc. only | Harper | Ector | 6 | 88K | 60K | Jan 1993 – Apr 2026 |
| Ector -AM- Fee O-10-35104 | Aghorn Operating, Inc. only | Harper | Ector | 2 | 86K | 98.6K | Apr 2000 – Feb 2026 |
| Cowden, Elliott F. O-10-2439 | Aghorn Operating, Inc. only | Harper | Ector | 6 | 78.7K | 46.5K | Jan 1993 – Jun 2011 |
| Ector Fee Unit O-10-36622 | Aghorn Operating, Inc. only | Harper, SE. (Ellen.) | Ector | 1 | 77.5K | 52K | Dec 2000 – Feb 2026 |
| Ector -AM- Fee O-10-18059 | Aghorn Operating, Inc. only | Harper (Ellenburger) | Ector | 1 | 76.8K | 69.4K | Jan 1993 – Feb 2026 |
| Parker O-10-25642 | Acoma Operating, LLC only | Harper | Ector | 4 | 73.8K | 54.9K | Jan 1993 – Apr 2026 |
| Cowden -11- O-10-32085 | Aghorn Operating, Inc. only | Harper (Glorieta) | Ector | 2 | 70.9K | 27K | Jan 1993 – Feb 2026 |
| Cowden "14" O-10-33482 | Aghorn Operating, Inc. only | Harper, W. (Pennsylvanian) | Ector | 1 | 67K | 16K | Jan 1993 – Feb 2026 |
| Moss, Paul, Etal -B- Tract 1 O-10-17852 | OXY USA WTP LP only | Harper (Ellenburger) | Ector | 1 | 65.6K | 110K | Jan 1993 – May 2018 |
| TXL -B- O-10-2473 | Walsh & Watts, Inc. only | Harper | Ector | 5 | 64.4K | 1.73K | Jan 1993 – Apr 2026 |
| Moss E O-10-36119 | Hilcorp Energy Company only | Harper (Strawn) | Ector | 3 | 62.9K | 136K | Aug 1999 – Jan 2014 |
| Fraser, Geo. C. -B- O-10-2441 | Burleson Petroleum, Inc. only | Harper | Ector | 6 | 59.9K | 76.2K | Jan 1993 – Apr 2026 |
| Ector -T- Fee O-10-11684 | Pen-Tex Production Co. Inc. only | Harper | Ector | 10 | 56.8K | 38.1K | Jan 1993 – Apr 2026 |
| Cowden, W. E. O-10-29598 | Baker Operating, Inc. only | Harper | Ector | 9 | 53.4K | 9.73K | Jan 1993 – Mar 2026 |
| Ector -H- Fee O-10-9761 | Formentera Operations LLC only | Harper | Ector | 13 | 52.5K | 29.8K | Jan 1993 – Apr 2026 |
| Cowden -H- O-10-31683 | Baker Operating, Inc. only | Harper | Ector | 2 | 49.2K | 9.94K | Jan 1993 – Apr 2026 |