| Tom Oconnor (5800 SD) Fld. Unit O-2-5280 | Hilcorp Energy Company only | Tom Oconnor (5800) | Refugio | 594 | 22.8M | 14.9M | Jan 1993 – Jul 2026 |
| Williams, Maude, Etal -A- O-2-2533 | Hilcorp Energy Company only | Lake Pasture (H-440 Sand) | Refugio | 176 | 11.1M | 179M | Jan 1993 – Jul 2026 |
| WLP O-2-8579 | T-C Oil Company, LLC only | Lake Pasture (H-434) | Refugio | 105 | 9.17M | 115M | Jan 2001 – Jul 2026 |
| T-C Oil Co.- O'Connor O-2-2554 | T-C Oil Company, LLC only | Lake Pasture (H-440 Sand) | Refugio | 114 | 6.52M | 31.4M | Jan 1993 – Jul 2026 |
| Oconnor, Dennis, Etal -L- O-2-2845 | T-C Oil Company, LLC only | Lake Pasture (H-440 Sand) | Refugio | 81 | 3.49M | 48.5M | Jan 1993 – Jul 2026 |
| O'Connor, Thomas -C- O-2-2876 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 59 | 2.99M | 2.17M | Jan 1993 – Jul 2026 |
| Heard, Fannie V. W., Mrs. O-2-2586 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 60 | 2.28M | 1.64M | Jan 1993 – Jul 2026 |
| Oconnor, Thomas, -C- O-2-2587 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 51 | 2.22M | 2.1M | Jan 1993 – Jul 2026 |
| Heard, Fannie V. W., Mrs. O-2-2546 | Hilcorp Energy Company only | Tom Oconnor (4500 Greta Mass.) | Refugio | 46 | 2.17M | 929K | Jan 1993 – Jul 2026 |
| River Ranch -a-/Williams State U O-2-9301 | T-C Oil Company, LLC only | Anaqua (3100) | Refugio | 12 | 1.99M | 509K | Sep 2008 – Jul 2026 |
| Lambert, M. F. O-2-2115 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 45 | 1.73M | 2.54M | Jan 1993 – Jul 2026 |
| Heard, Fannie, V. W., Mrs. O-2-2874 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 43 | 1.63M | 1.67M | Jan 1993 – Jul 2026 |
| Heard, Clement O-2-2585 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 20 | 1.34M | 986K | Jan 1993 – Jul 2026 |
| Oconnor -D- O-2-2834 | T-C Oil Company, LLC only | Lake Pasture (H-440 Sand) | Refugio | 25 | 1.32M | 5.82M | Jan 1993 – Jul 2026 |
| Heard, Clement O-2-2873 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 22 | 1.22M | 1.07M | Jan 1993 – Jul 2026 |
| Tom O'CONNOR(5600 Foot Sand)unit O-2-8950 | Hilcorp Energy Company only | Tom O'Connor (5600 Foot Sand) | Refugio | 59 | 1.13M | 357K | Mar 2005 – Jul 2026 |
| Reilly, Annie, et Vir O-2-2588 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 15 | 1.07M | 997K | Jan 1993 – Jul 2026 |
| Tom O'Connor (5730 Ft. Sd.) Unit O-2-8569 | Hilcorp Energy Company only | Tom O'Connor (5730, East) | Refugio | 38 | 1.01M | 815K | Oct 2000 – Jul 2026 |
| O'Connor -H- O-2-9321 | T-C Oil Company, LLC only | Anaqua (3100) | Refugio | 7 | 987K | 280K | May 2009 – Jul 2026 |
| Heard, Fannie V. W. O-2-3977 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 11 | 887K | 965K | Jan 1993 – Jul 2026 |
| Heard, J. F. B. O-2-3978 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 17 | 869K | 1.83M | Jan 1993 – Jul 2026 |
| Mellon Oil Unit O-2-2192 | T-C Oil Company, LLC only | Tom Oconnor (4400) | Refugio | 28 | 852K | 451K | Jan 1993 – Jul 2017 |
| Heard, Claude E. et AL O-2-1798 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 19 | 760K | 407K | Jan 1993 – Jul 2026 |
| River Ranch -B- State Unit O-2-9357 | T-C Oil Company, LLC only | Anaqua (3100) | Refugio | 6 | 701K | 104K | Nov 2009 – Jul 2026 |
| O'Connor O-2-8367 | T-C Oil Company, LLC only | Huff (4400) | Refugio | 19 | 693K | 597K | Jan 1998 – Jul 2026 |
| Lambert, M. F. O-2-2003 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 21 | 661K | 1.24M | Jan 1993 – Sep 2021 |
| Oconnor, Thomas -A- O-2-1542 | Hilcorp Energy Company only | Tom Oconnor | Refugio | 36 | 650K | 756K | Jan 1993 – Jul 2026 |
| Oconnor, Thomas, -C- O-2-2566 | Hilcorp Energy Company only | Tom Oconnor (4500 Greta Mass.) | Refugio | 18 | 646K | 278K | Jan 1993 – Jul 2026 |
| Roche, K. D. -A- O-2-3469 | Kovar Operating, LLC only | Roche (-C-) | Refugio | 24 | 620K | 1.45M | Jan 1993 – Jan 2021 |
| Heard, Clement O-2-2523 | Hilcorp Energy Company only | Tom Oconnor (4500 Greta Mass.) | Refugio | 16 | 539K | 277K | Jan 1993 – Jul 2026 |
| Clay Pasture -B- State Unit O-2-9381 | T-C Oil Company, LLC only | Anaqua, South (3000) | Refugio | 3 | 539K | 104K | Dec 2009 – Jul 2026 |
| O'Connor, Thomas "A" O-2-7579 | Hilcorp Energy Company only | Tom O'Connor (5770 U, South) | Refugio | 28 | 538K | 627K | Jan 1993 – Jul 2026 |
| Tom O'Connor (4150 Ft. Sd.) Unit O-2-8874 | Hilcorp Energy Company only | Tom O'Connor (4150) | Refugio | 68 | 512K | 461K | Jun 2004 – Jul 2026 |
| Reilly, Annie, et Vir O-2-2877 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 14 | 507K | 470K | Jan 1993 – Jul 2026 |
| Lambert, M. F. O-2-2880 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 40 | 504K | 1.58M | Jan 1993 – Jul 2026 |
| Lambert, M. F. O-2-3976 | Hilcorp Energy Company only | Greta (4400) | Refugio | 14 | 497K | 399K | Jan 1993 – Sep 2021 |
| BP O-2-8324 | Gilster, Ralph R. III only | Lake Pasture, West (4450) | Refugio | 26 | 485K | 839K | Nov 1997 – Mar 2001 |
| Williams, Maude, Etal -A- O-2-820 | Hilcorp Energy Company only | Lake Pasture (FS-527) | Refugio | 15 | 466K | 1.27M | Jan 1993 – Jul 2026 |
| Lambert, M. F. O-2-2590 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 39 | 446K | 1.58M | Jan 1993 – Jul 2026 |
| Williams, Maude, et al -A- O-2-2878 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 10 | 441K | 369K | Jan 1993 – Jul 2026 |
| Lake Pasture /FT-569/ Field Unit O-2-4763 | Hilcorp Energy Company only | Lake Pasture (FT-569) | Refugio | 24 | 424K | 955K | Jan 1993 – Jul 2026 |
| Lambert, M.F. O-2-9384 | Hilcorp Energy Company only | Tom O'Connor (4650) | Refugio | 3 | 414K | 178K | Feb 2010 – Jul 2026 |
| Heard, J. F. B.- Tex O-2-3996 | Greta Operating Company LLC only | Greta (4400) | Refugio | 15 | 403K | 219K | Jan 1993 – Jul 2026 |
| O'Brien, J. M. O-2-3981 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 10 | 380K | 252K | Jan 1993 – Jul 2026 |
| Williams, Maude, Etal -A- O-2-2527 | Hilcorp Energy Company only | Lake Pasture (FS-523) | Refugio | 12 | 379K | 658K | Jan 1993 – Jul 2026 |
| O'Connor O-2-7505 | T-C Oil Company, LLC only | Huff (5000) | Refugio | 8 | 366K | 452K | Jan 1993 – Jul 2026 |
| O'Connor, M. E. O-2-5130 | T-C Oil Company, LLC only | Woodsboro, South (4200) | Refugio | 23 | 360K | 134K | Jan 1993 – Jul 2026 |
| Schirmer, Henry O-2-8186 | Bent Wing Energy, LLC only | Bonnie View (4700) | Refugio | 3 | 359K | 196K | Mar 1996 – Jul 2026 |
| O'Connor O-2-11800 | T-C Oil Company, LLC only | McFaddin (4400) | Refugio | 15 | 354K | 164K | Jul 2019 – Jul 2026 |
| Roche O-2-8604 | Finaly Resources LLC only | Cactus (Frio Massive) | Refugio | 4 | 330K | 355K | Jun 2000 – Jul 2026 |