| Cockburn, H. C. O-3-2899 | Orx Resources, L.L.C. only | Magnet Withers | Wharton | 143 | 6.54M | 5.82M | Jan 1993 – Apr 2026 |
| Cockburn -B- O-3-2868 | McGowan Working Partners, Inc. only | Magnet Withers | Wharton | 12 | 463K | 122K | Jan 1993 – Apr 2026 |
| Cockburn, H.C. O-3-25056 | Orx Resources, L.L.C. only | Magnet Withers (Frio Cons.) | Wharton | 21 | 450K | 498K | Aug 2007 – Apr 2026 |
| Cockburn, H. C. Etal -B- O-3-2874 | Orx Resources, L.L.C. only | Magnet Withers | Wharton | 1 | 284K | 158K | Jan 1993 – Sep 2014 |
| Cockburn Unit O-3-16109 | McGowan Working Partners, Inc. only | Magnet Withers, E.(frio Lower) | Wharton | 2 | 223K | 31.8K | Jan 1993 – Apr 2004 |
| Cockburn Deep Frio Unit No. 1 O-3-26110 | Orx Resources, L.L.C. only | Magnet Withers (Frio Cons.) | Wharton | 4 | 182K | 168K | Oct 2012 – Apr 2026 |
| Cockburn Deep Frio Unit No. 1 G-3-237668 | Orx Resources, L.L.C. only | Magnet Withers (Frio Cons.) | Wharton | 1 | 141K | 225K | Dec 2007 – Apr 2026 |
| Cockburn Oil Corp. O-3-2612 | Mosaic Oil LLC only | Lane City | Wharton | 5 | 125K | 24.1K | Jan 1993 – Sep 2021 |
| Cockburn Oil Corp. O-3-2900 | Exxon Mobil Corporation only | Magnet Withers | Wharton | 1 | 110K | 81K | Jan 1993 – Mar 2002 |
| Cockburn, H. C. O-3-7100 | KCS Resources, Inc. only | Magnet Withers (F-10, East) | Wharton | 2 | 96.1K | 116K | Jan 1993 – Jul 2007 |
| Cockburn Oil Unit O-3-23609 | Charolais Energy, LLC only | Magnet Withers, E.(frio Lower) | Wharton | 1 | 86.5K | 280 | Dec 1998 – Jan 2026 |
| Cockburn, H.C. O-3-15955 | Atasca Resources, Inc. only | Magnet Withers, E.(frio Lower) | Wharton | 1 | 73.1K | 13.9K | Jan 1993 – Feb 2004 |
| Cockburn Oil Corp. O-3-4733 | Lucky Lad Energy, LLC only | Humble | Harris | 3 | 65.6K | 269 | Jan 1993 – Mar 2023 |
| Cockburn Deep Frio Unit NO.1 G-3-219124 | White Oak Operating Company LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 47.1K | 333K | Mar 2006 – Jul 2015 |
| Cockburn, H. C. O-3-7219 | KCS Resources, Inc. only | Magnet Withers (F- 7-B, East) | Wharton | 1 | 46K | 39.5K | Jan 1993 – Jul 2007 |
| Cockburn Unit O-3-21160 | Atasca Resources, Inc. only | Magnet Withers, E. (Frio) | Wharton | 1 | 40.9K | 12.2K | Feb 1993 – Jun 1997 |
| Cockburn State Yegua Unit G-3-245421 | Milagro Exploration, LLC only | Magnet Withers (Martinez SD) | Wharton | 1 | 38.5K | 8.99M | Nov 2008 – Oct 2010 |
| Cockburn, H.C. O-3-20568 | KCS Resources, Inc. only | Magnet Withers (F-18, East) | Wharton | 1 | 29.6K | 33.2K | Jan 1993 – Mar 2007 |
| Cockburn, H.C. Deep Frio O.U. 1 O-3-19590 | KCS Resources, Inc. only | Magnet Withers (F-18B, East) | Wharton | 1 | 27.4K | 102K | Jan 1993 – Jul 2007 |
| Cockburn, H. C. G-3-242048 | Milagro Exploration, LLC only | Magnet Withers | Wharton | 1 | 26K | 34.6K | Jun 2007 – Sep 2008 |
| Cockburn Oil Unit O-3-20766 | Rodessa Operating Company only | Magnet Withers, E. (F-7) | Wharton | 1 | 26K | 2.71K | Jan 1993 – Nov 1998 |
| Cockburn, H. C. O-3-20468 | Exxon Mobil Corporation only | Magnet Withers (F-5) | Wharton | 1 | 23.7K | 15.4K | Jan 1993 – Apr 1999 |
| Cockburn, H. C. G-3-219134 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 23.3K | 197K | Jun 2006 – Dec 2013 |
| Cockburn, H.C. G-3-273703 | Orx Resources, L.L.C. only | Magnet Withers (Frio Cons.) | Wharton | 1 | 22.1K | 49.2K | Sep 2014 – Dec 2022 |
| Cockburn Unit 3 O-3-16867 | Boling Production Company, Inc. only | Cockburn (Marg) | Wharton | 1 | 19.1K | 137 | Jan 1993 – Jul 2008 |
| Cockburn, H. C. G-3-221740 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 17K | 273K | Apr 2006 – May 2014 |
| Cockburn, H. C. G-3-253222 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 11.1K | 129K | Oct 2008 – Mar 2012 |
| Cockburn, H. C. O-3-8460 | Exxon Corp. only | Magnet Withers (F-11-B, E.) | Wharton | 4 | 8.74K | 8.26K | Jan 1993 – Sep 1995 |
| Cockburn Oil Corp. Unit O-3-21370 | Charolais Energy, LLC only | Magnet Withers, E.(frio Lower) | Wharton | 1 | 7.04K | 2.2K | Jan 1993 – Dec 1993 |
| Cockburn, H. C. G-3-225118 | Orx Resources, L.L.C. only | Magnet Withers (Marginulina 2) | Wharton | 1 | 6.75K | 7.43K | Apr 2006 – Mar 2007 |
| Cockburn State Yegua Unit O-3-25786 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 6.44K | 5.63K | Aug 2011 – Jan 2014 |
| Cockburn Deep Frio Unit No. 1 G-3-237666 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 6.06K | 220K | Dec 2007 – Jan 2014 |
| Cockburn Unit O-3-24923 | McGowan Working Partners, Inc. only | Magnet Withers | Wharton | 1 | 5.94K | 892 | Feb 2005 – Mar 2010 |
| Cockburn Oil O-3-22325 | Hyquest Energy, Inc. only | Lane City | Wharton | 1 | 4.3K | 9 | Mar 1994 – Mar 1995 |
| Cockburn, H.C. O-3-20257 | KCS Resources, Inc. only | Magnet Withers (F-17, E.) | Wharton | 1 | 3.6K | 6.1K | Jul 1993 – Jul 2007 |
| Cockburn Deep Frio Unit NO.1 G-3-242508 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 3.59K | 90.7K | Jul 2008 – Sep 2013 |
| Cockburn, L. H. Unit 1 O-3-13271 | Boling Production Company, Inc. only | Cockburn (Marg) | Wharton | 1 | 3.23K | 30 | Jan 1993 – Aug 1998 |
| Cockburn Unit 5 O-3-18995 | Boling Production Company, Inc. only | Cockburn (Marg) | Wharton | 1 | 1.7K | 94 | Jan 1993 – Jun 2003 |
| Gulf-Crown Cent. O-3-20668 | Cockburn Oil Corporation only | Liberty, South | Liberty | 3 | 918 | 3.14K | Jan 1993 – Jan 1994 |
| Cockburn, H.C. G-3-243697 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 566 | 18.2K | Aug 2008 – Dec 2009 |
| Cockburn, H.C. G-3-243687 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 532 | 208K | Jul 2008 – Jan 2013 |
| Cockburn G-13-259963 | Stonebriar Oil LLC only | Newark, East (Barnett Shale) | Wise | 1 | 477 | 223K | Sep 2008 – Oct 2012 |
| Cockburn, H. C. G-3-179202 | Milagro Exploration, LLC only | Magnet Withers (Miocene 3850) | Wharton | 1 | 435 | 381K | Aug 2000 – Aug 2008 |
| Cockburn, H.C. Estate et Al O-3-20505 | Voight Oil Company only | Hollywood, South (Frio 7500) | Wharton | 1 | 414 | 12.8K | Jan 1993 – Jun 1993 |
| Cockburn, H. C. G-3-255993 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 309 | 26.6K | Mar 2010 – Jul 2011 |
| Cockburn, H. C. G-3-201541 | Central Gulf Petroleum Inc only | Magnet Withers (M-4) | Wharton | 1 | 297 | 954K | Mar 2004 – Nov 2018 |
| Cockburn, H. C. G-3-219120 | Milagro Exploration, LLC only | Magnet Withers (F-24) | Wharton | 1 | 103 | 140K | Apr 2006 – Aug 2010 |
| Cockburn, H.C. G-3-257821 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 67 | 69.2K | Jul 2010 – Jun 2013 |
| Cockburn, H. C. G-3-151085 | Orx Resources, L.L.C. only | Magnet Withers (Miocene 4200) | Wharton | 1 | 56 | 184K | Sep 1994 – Mar 2007 |
| Cockburn, H. C. G-3-243695 | Milagro Exploration, LLC only | Magnet Withers | Wharton | 1 | 8 | 48.2K | Jun 2007 – Nov 2007 |