| Heard, Fannie V. W., Mrs. O-2-2586 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 60 | 2.28M | 1.64M | Jan 1993 – Apr 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 – Apr 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 – Aug 2023 |
| Heard, Clement O-2-2585 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 20 | 1.34M | 986K | Jan 1993 – Apr 2026 |
| Heard, Clement O-2-2873 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 22 | 1.22M | 1.07M | Jan 1993 – Apr 2026 |
| Heard, Fannie V. W. O-2-3977 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 11 | 887K | 965K | Jan 1993 – Apr 2026 |
| Heard, J. F. B. O-2-3978 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 17 | 869K | 1.83M | Jan 1993 – Apr 2026 |
| Heard, Claude E. et Al O-2-1798 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 19 | 760K | 407K | Jan 1993 – Apr 2026 |
| Heard, Clement O-2-2523 | Hilcorp Energy Company only | Tom Oconnor (4500 Greta Mass.) | Refugio | 16 | 539K | 277K | Jan 1993 – Apr 2026 |
| Heard, J. F. B.- Tex O-2-3996 | Greta Operating Company LLC only | Greta (4400) | Refugio | 15 | 403K | 219K | Jan 1993 – Apr 2026 |
| Heard, Fannie V.W. Mrs. O-2-7813 | Hilcorp Energy Company only | Tom Oconnor (5200, East) | Refugio | 17 | 312K | 705K | Jan 1993 – Apr 2026 |
| Heard, F. V. W. O-2-3994 | Greta Operating Company LLC only | Greta (4400) | Refugio | 3 | 310K | 160K | Jan 1993 – Apr 2026 |
| Heard, F. V. W. O-2-8810 | Dorchester Operating Company LLC only | Greta (F-3 West) | Refugio | 2 | 262K | 207K | Jul 2003 – Jul 2016 |
| Heard, Claude E., Etal O-2-2584 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 7 | 196K | 433K | Jan 1993 – Mar 2011 |
| Heard, Claude E., et Al O-2-1539 | Hilcorp Energy Company only | Tom Oconnor | Refugio | 12 | 163K | 369K | Jan 1993 – Jan 2023 |
| Heard, Clement O-2-4791 | Hilcorp Energy Company only | Tom Oconnor (7500) | Refugio | 4 | 105K | 332K | Jan 1993 – Oct 2009 |
| Heard, Fannie V.W. Mrs. O-2-6949 | Hilcorp Energy Company only | Tom Oconnor (5625 Sand) | Refugio | 3 | 101K | 157K | Jan 1993 – Apr 2010 |
| Heard Fannie V.W. Mrs O-2-6800 | Hilcorp Energy Company only | Tom O'Connor (4150) | Refugio | 7 | 101K | 892K | Jan 1993 – May 2004 |
| Heard, Clement O-2-8936 | Hilcorp Energy Company only | Tom Oconnor (4600) | Refugio | 2 | 95.3K | 56.2K | Nov 2004 – Aug 2017 |
| Heard, A. W. J. O-2-1349 | Paleo Oil Company LLC only | Refugio Heard (Area) | Refugio | 3 | 85.4K | 89.7K | Jan 1993 – Mar 2026 |
| Heard, Claude E. et Al O-2-9330 | Hilcorp Energy Company only | Tom Oconnor, N. (5150) | Refugio | 3 | 83.3K | 21.8K | Jun 2009 – Apr 2026 |
| Heard, J. F. B. O-2-3958 | Acock/Anaqua Operating Co., LP only | Greta (4400) | Refugio | 1 | 77.2K | 142 | Jan 1993 – Aug 2005 |
| Clement Heard 42 O-2-11813 | Hilcorp Energy Company only | Tom Oconnor (4500 Greta Mass.) | Refugio | 1 | 69.1K | 7.93K | Aug 2019 – Apr 2026 |
| Heard, Mrs. Fannie V. W. O-2-8418 | Hilcorp Energy Company only | Tom Oconnor (5250) | Refugio | 3 | 69K | 106K | Dec 1998 – Jan 2020 |
| Heard, F. V. W. O-2-8731 | Greta Operating Company LLC only | Greta, Deep (5400) | Refugio | 1 | 66.8K | 264K | Aug 2002 – May 2025 |
| Heard, Fannie V. W., Mrs. O-2-1541 | Hilcorp Energy Company only | Tom Oconnor | Refugio | 14 | 59.8K | 120K | Jan 1995 – Jan 2021 |
| J.F.B. Heard-Arco O-2-11011 | Greta Operating Company LLC only | Greta (4400) | Refugio | 1 | 42.4K | 25K | Oct 2014 – Apr 2026 |
| Heard, F.V.W. "B" O-2-8226 | CTR Petroleum, Inc. only | Refugio Heard (5350) | Refugio | 1 | 40.1K | 68.8K | Jan 1997 – Apr 2009 |
| Clement Heard 41 O-2-11811 | Hilcorp Energy Company only | Tom Oconnor (4500 Greta Mass.) | Refugio | 1 | 34K | 2.08K | Jul 2019 – Mar 2023 |
| Heard, Fannie V. W. O-2-5382 | Primrose Operating Company only | Greta, Deep (5850) | Refugio | 1 | 26.4K | 40.4K | Apr 1995 – Aug 2003 |
| Heard, Ira "B" O-2-9238 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 1 | 25.3K | 58.1K | Jul 2008 – Oct 2022 |
| Heard, F. V. W. O-2-8920 | Dorchester Operating Company LLC only | Greta, West (F-5) | Refugio | 1 | 22.1K | 26.3K | Oct 2004 – Sep 2008 |
| Wilson Heard 'B' O-2-10161 | Hilcorp Energy Company only | Tom Oconnor | Refugio | 1 | 20.8K | 8.43K | Apr 2012 – Oct 2025 |
| Claude E. Heard, et Al O-2-10996 | Hilcorp Energy Company only | Tom Oconnor (5200, East) | Refugio | 2 | 20.5K | 6.24K | Jan 2018 – Jan 2023 |
| Heard, A.W.J. -C- O-2-6091 | CTR Petroleum, Inc. only | Refugio Heard (Area) | Refugio | 2 | 18.8K | 67.3K | Jan 1993 – Mar 1998 |
| Heard, Claud E., et Al O-2-2872 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 7 | 17.5K | 59.4K | Jan 1993 – Apr 2007 |
| Heard, Clement O-2-7842 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 1 | 16.5K | 56.2K | Jan 1993 – Feb 2006 |
| Heard-State Unit #2 O-2-7641 | CTR Petroleum, Inc. only | Refugio New (3670) | Refugio | 1 | 14.9K | 7.47K | Jan 1993 – Sep 1997 |
| Heard, J. F. B. G-2-218347 | Greta Operating Company LLC only | Greta, North (6100) | Refugio | 1 | 14.4K | 317K | Dec 2005 – Oct 2014 |
| Heard, F.V.W. "B" O-2-7982 | CTR Petroleum, Inc. only | Refugio Heard (6300) | Refugio | 1 | 13.1K | 83K | Aug 1994 – May 2003 |
| Heard, Wilson "B" O-2-8631 | Hilcorp Energy Company only | Tom Oconnor | Refugio | 1 | 12.8K | 62.3K | Jun 2001 – Oct 2002 |
| Heard, Ira "A" O-2-8135 | Quintana Pet. Corp. only | Tom Oconnor (7200) | Refugio | 1 | 12.1K | 23.7K | Oct 1995 – Dec 1996 |
| Heard, Ira "B" O-2-8793 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 1 | 12K | 129K | May 2003 – Oct 2007 |
| Rea, W. L. O-2-1369 | Mission River Systems, Inc. only | Refugio Heard (Area) | Refugio | 7 | 11.4K | 3.79K | Mar 1993 – Aug 2009 |
| Heard, Claude E. et Al O-2-8744 | Hilcorp Energy Company only | Tom Oconnor (5400 Sand) | Refugio | 1 | 10.7K | 42.2K | Oct 2002 – Mar 2009 |
| Heard, Mrs. Fannie V. W. G-2-180992 | Hilcorp Energy Company only | Tom Oconnor (5300, East) | Refugio | 1 | 10.4K | 2.31M | Dec 2000 – May 2004 |
| Heard, Clement O-2-6410 | Hilcorp Energy Company only | Tom O'Connor (4150) | Refugio | 3 | 9.85K | 17.9K | Jan 1993 – Nov 1997 |
| Longoria Unit O-2-9272 | Bellows Operating Co., L. C. only | Refugio Heard (Area) | Refugio | 1 | 9.1K | 0 | Nov 2008 – Dec 2014 |
| Heard G-2-244403 | Acock/Anaqua Operating Co., LP only | Refugio Heard (5700) | Refugio | 1 | 8.56K | 131K | Oct 2008 – Feb 2014 |
| JFB Heard - Htex #2H O-2-11833 | Greta Operating Company LLC only | Greta (4400) | Refugio | 1 | 8.07K | 6.04K | Sep 2019 – Jan 2026 |