| Tom Oconnor (5800 SD) Fld. Unit O-2-5280 | Hilcorp Energy Company only | Tom Oconnor (5800) | Refugio | 595 | 23M | 15M | by Jan 1993 – Aug 2026 |
| Williams, Maude, Etal -A- O-2-2533 | Hilcorp Energy Company only | Lake Pasture (H-440 Sand) | Refugio | 176 | 11.2M | 179M | by Jan 1993 – Jul 2026 |
| WLP O-2-8579 | T-C Oil Company, LLC only | Lake Pasture (H-434) | Refugio | 105 | 9.2M | 115M | Jan 2001 – Aug 2026 |
| T-C Oil Co.- O'Connor O-2-2554 | T-C Oil Company, LLC only | Lake Pasture (H-440 Sand) | Refugio | 114 | 6.6M | 31.5M | by Jan 1993 – Aug 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 | by Jan 1993 – Aug 2026 |
| O'Connor, Thomas -C- O-2-2876 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 59 | 2.99M | 2.17M | by Jan 1993 – Aug 2026 |
| Heard, Fannie V. W., Mrs. O-2-2586 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 60 | 2.28M | 1.64M | by Jan 1993 – Aug 2026 |
| Oconnor, Thomas, -C- O-2-2587 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 51 | 2.23M | 2.11M | by Jan 1993 – Aug 2026 |
| Heard, Fannie V. W., Mrs. O-2-2546 | Hilcorp Energy Company only | Tom Oconnor (4500 Greta Mass.) | Refugio | 46 | 2.18M | 931K | by Jan 1993 – Aug 2026 |
| River Ranch -a-/Williams State U O-2-9301 | T-C Oil Company, LLC only | Anaqua (3100) | Refugio | 12 | 2M | 533K | Nov 2008 – Aug 2026 |
| Lambert, M. F. O-2-2115 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 45 | 1.76M | 2.54M | by Jan 1993 – Aug 2026 |
| Heard, Fannie, V. W., Mrs. O-2-2874 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 43 | 1.63M | 1.67M | by Jan 1993 – Aug 2023 |
| Heard, Clement O-2-2585 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 20 | 1.34M | 986K | by Jan 1993 – Apr 2026 |
| Oconnor -D- O-2-2834 | T-C Oil Company, LLC only | Lake Pasture (H-440 Sand) | Refugio | 25 | 1.32M | 5.83M | by Jan 1993 – Aug 2026 |
| Heard, Clement O-2-2873 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 22 | 1.22M | 1.07M | by Jan 1993 – Aug 2026 |
| Tom O'CONNOR(5600 Foot Sand)unit O-2-8950 | Hilcorp Energy Company only | Tom O'Connor (5600 Foot Sand) | Refugio | 59 | 1.14M | 358K | Mar 2005 – Jul 2026 |
| Reilly, Annie, et Vir O-2-2588 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 15 | 1.08M | 998K | by Jan 1993 – Aug 2026 |
| Tom O'Connor (5730 Ft. Sd.) Unit O-2-8569 | Hilcorp Energy Company only | Tom O'Connor (5730, East) | Refugio | 38 | 1.02M | 816K | Oct 2000 – Jul 2026 |
| O'Connor -H- O-2-9321 | T-C Oil Company, LLC only | Anaqua (3100) | Refugio | 7 | 990K | 293K | May 2009 – Aug 2026 |
| Heard, Fannie V. W. O-2-3977 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 11 | 890K | 965K | by Jan 1993 – Aug 2026 |
| Heard, J. F. B. O-2-3978 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 17 | 874K | 1.83M | by Jan 1993 – Aug 2026 |
| Mellon Oil Unit O-2-2192 | T-C Oil Company, LLC only | Tom Oconnor (4400) | Refugio | 28 | 852K | 451K | by Jan 1993 – Mar 2015 |
| Heard, Claude E. et Al O-2-1798 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 19 | 770K | 407K | by Jan 1993 – Aug 2026 |
| O'Connor O-2-8367 | T-C Oil Company, LLC only | Huff (4400) | Refugio | 19 | 707K | 601K | Jan 1998 – Aug 2026 |
| River Ranch -B- State Unit O-2-9357 | T-C Oil Company, LLC only | Anaqua (3100) | Refugio | 6 | 701K | 104K | Nov 2009 – Mar 2021 |
| Oconnor, Thomas -A- O-2-1542 | Hilcorp Energy Company only | Tom Oconnor | Refugio | 36 | 666K | 758K | Nov 1993 – Aug 2026 |
| Lambert, M. F. O-2-2003 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 21 | 661K | 1.24M | by Jan 1993 – Mar 2020 |
| Oconnor, Thomas, -C- O-2-2566 | Hilcorp Energy Company only | Tom Oconnor (4500 Greta Mass.) | Refugio | 18 | 648K | 279K | by Jan 1993 – Aug 2026 |
| Clay Pasture -B- State Unit O-2-9381 | T-C Oil Company, LLC only | Anaqua, South (3000) | Refugio | 3 | 548K | 106K | Dec 2009 – Aug 2026 |
| Heard, Clement O-2-2523 | Hilcorp Energy Company only | Tom Oconnor (4500 Greta Mass.) | Refugio | 16 | 540K | 277K | by Jan 1993 – Aug 2026 |
| O'Connor, Thomas "A" O-2-7579 | Hilcorp Energy Company only | Tom O'Connor (5770 U, South) | Refugio | 28 | 539K | 628K | by 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 2025 |
| Reilly, Annie, et Vir O-2-2877 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 14 | 508K | 471K | by Jan 1993 – Aug 2026 |
| Lambert, M. F. O-2-2880 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 40 | 505K | 1.58M | by Jan 1993 – Aug 2026 |
| Lambert, M. F. O-2-3976 | Hilcorp Energy Company only | Greta (4400) | Refugio | 14 | 497K | 399K | by Jan 1993 – Apr 2020 |
| Williams, Maude, Etal -A- O-2-820 | Hilcorp Energy Company only | Lake Pasture (FS-527) | Refugio | 15 | 455K | 1.25M | by Jan 1993 – Jul 2026 |
| Lambert, M. F. O-2-2590 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 39 | 448K | 1.58M | by Jan 1993 – Aug 2026 |
| Williams, Maude, et al -A- O-2-2878 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 10 | 441K | 369K | by Jan 1993 – Jun 2024 |
| Lake Pasture /FT-569/ Field Unit O-2-4763 | Hilcorp Energy Company only | Lake Pasture (FT-569) | Refugio | 24 | 430K | 969K | by Jan 1993 – Jul 2026 |
| Lambert, M.F. O-2-9384 | Hilcorp Energy Company only | Tom O'Connor (4650) | Refugio | 3 | 415K | 178K | Mar 2010 – Aug 2026 |
| Heard, J. F. B.- Tex O-2-3996 | Greta Operating Company LLC only | Greta (4400) | Refugio | 15 | 404K | 220K | by Jan 1993 – Aug 2026 |
| Boenig, H. A. & W. A. O-2-4640 | Bay Rock Operating Company only | Woodsboro (FQ-31, West) | Refugio | 2 | 383K | 22 | by Jan 1993 – Aug 2026 |
| O'Brien, J. M. O-2-3981 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 10 | 381K | 253K | by Jan 1993 – Aug 2026 |
| Williams, Maude, Etal -A- O-2-2527 | Hilcorp Energy Company only | Lake Pasture (FS-523) | Refugio | 12 | 379K | 658K | by Jan 1993 – Jan 2017 |
| O'Connor O-2-11800 | T-C Oil Company, LLC only | McFaddin (4400) | Refugio | 15 | 368K | 168K | Jul 2019 – Aug 2026 |
| O'Connor O-2-7505 | T-C Oil Company, LLC only | Huff (5000) | Refugio | 8 | 368K | 453K | by Jan 1993 – Aug 2026 |
| O'Connor, M. E. O-2-5130 | T-C Oil Company, LLC only | Woodsboro, South (4200) | Refugio | 23 | 360K | 134K | by Jan 1993 – May 2019 |
| Heard, Fannie V.W. Mrs. O-2-7813 | Hilcorp Energy Company only | Tom Oconnor (5200, East) | Refugio | 17 | 325K | 705K | by Jan 1993 – Jul 2026 |
| Williams, Maude, Etal, -A- O-2-2589 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 9 | 323K | 573K | by Jan 1993 – Apr 2025 |
| Oconnor, Dennis, et al -N- O-2-3598 | T-C Oil Company, LLC only | Huff (372) | Refugio | 7 | 316K | 483K | by Jan 1993 – Aug 2026 |