| Cockburn, H. C. G-3-242501 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 2 | 146K | Apr 2007 – Jun 2009 |
| Cockburn, H. C. G-3-32895 | Exxon Corp. only | Magnet Withers (Miocene Upper) | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. G-3-34606 | Exxon Mobil Corporation only | Magnet Withers (F-16, E.) | Wharton | 1 | 0 | 0 | — |
| Cockburn Oil Corporation G-3-42692 | Mosaic Oil LLC only | Lane City (Miocene 4300 Middle) | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. G-3-65719 | Exxon Corp. only | Magnet Withers (Miocene Upper) | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. G-3-67116 | Exxon Corp. only | Magnet Withers (Marginulina 1) | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. G-3-67396 | Exxon Corp. only | Magnet Withers (F-15, E.) | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. G-3-68333 | Exxon Corp. only | Magnet Withers (F-10, East) | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. -B- G-3-69040 | McGowan Working Partners, Inc. only | Magnet Withers | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. G-3-89173 | Exxon Corp. only | Magnet Withers (F-15, E.) | Wharton | 1 | 0 | 0 | — |
| Cockburn, H.C. G-3-102120 | Exxon Mobil Corporation only | Magnet Withers (Miocene 3850) | Wharton | 1 | 0 | 43.1K | by Jan 1993 – Jan 1996 |
| Cockburn Oil Corp. G-3-108058 | Exxon Corp. only | Magnet Withers (Heterostegina) | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. G-3-129241 | KCS Resources, Inc. only | Magnet Withers (Miocene 3850) | Wharton | 1 | 0 | 117K | by Jan 1993 – Jun 2002 |
| Cockburn, H. C. G-3-136078 | Exxon Corp. only | Magnet Withers (Miocene 4200) | Wharton | 1 | 0 | 1.4K | May 1994 – Jun 1994 |
| Cockburn, H. C. G-3-140134 | White Oak Operating Company LLC only | Magnet Withers (Marginulina 1) | Wharton | 1 | 0 | 306K | by Jan 1993 – Dec 2006 |
| Cockburn, H. C. G-3-141064 | Exxon Corp. only | Magnet Withers (Marginulina 1) | Wharton | 1 | 0 | 5.63K | by Jan 1993 – Mar 1993 |
| Cockburn, H. C. G-3-153034 | Milagro Exploration, LLC only | Magnet Withers (Miocene 4000) | Wharton | 1 | 0 | 36K | Apr 1995 – Feb 2010 |
| Cockburn, H. C. G-3-199423 | White Oak Operating Company LLC only | Wildcat | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. G-3-221789 | Milagro Exploration, LLC only | Magnet Withers (F- 9) | Wharton | 1 | 0 | 126K | May 2006 – Jun 2008 |
| Cockburn, H. C. G-3-239783 | White Oak Operating Company LLC only | Magnet Withers (Marginulina 1) | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. G-3-242370 | Orx Resources, L.L.C. only | Magnet Withers (Marginulina 2) | Wharton | 1 | 0 | 81.1K | May 2008 – Apr 2011 |
| Cockburn, H. C. G-3-243673 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 0 | 89.3K | Jul 2007 – Apr 2009 |
| Cockburn, H. C. G-3-249830 | Milagro Exploration, LLC only | Magnet Withers (Mio 4400) | Wharton | 1 | 0 | 53.4K | Dec 2007 – Nov 2008 |
| Cockburn, H. C. G-3-250212 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. G-3-258097 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 0 | 40.6K | Sep 2010 – Oct 2012 |
| Cockburn, H.C. G-3-271746 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 0 | 10.9K | Nov 2013 – Mar 2014 |
| Cockburn, H.C. G-3-271757 | Milagro Exploration, LLC only | Magnet Withers (Frio Cons.) | Wharton | 1 | 0 | 12.1K | Jan 2014 – May 2014 |
| Cockburn G-13-229743 | Rock Petroleum, LLC only | Risch, East (Atoka Congl.) | Wise | 1 | 0 | 0 | — |
| Cockburn, H. C. -A- O-3-2908 | G.R.P. Gauging, Inc. only | Magnet Withers | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. O-3-8555 | Exxon Mobil Corporation only | Magnet Withers (F-26 East, UP) | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. O-3-13056 | Exxon Corp. only | Wildcat | Wharton | 1 | 0 | 0 | — |
| Bock-Cockburn-Gulf Coast Water O-3-16536 | Boling Production Company, Inc. only | Bemus (5800 Marginulina) | Wharton | 1 | 0 | 1 | Dec 2004 – Dec 2004 |
| Cockburn, H. C. O-3-25057 | KCS Resources, Inc. only | Magnet Withers (Frio Cons.) | Wharton | 1 | 0 | 0 | — |
| Cockburn, H.C. O-3-25230 | Milagro Exploration, LLC only | Magnet Withers | — | 0 | 0 | 0 | — |
| H C Cockburn O-3-25615 | McGowan Working Partners, Inc. only | Magnet Withers, E. (Frio) | Wharton | 1 | 0 | 0 | — |
| Cockburn Oil Corp. Unit G-3-170592 | Charolais Energy, LLC only | Magnet Withers, E.(miocene 3670) | Wharton | 1 | 0 | 316K | Jul 1998 – May 2007 |
| Cockburn, H. C. G-3-225393 | Orx Resources, L.L.C. only | Magnet Withers (M-4) | Wharton | 1 | 0 | 26.8K | Aug 2006 – Jul 2007 |
| Cockburn, H. C. G-3-234823 | Orx Resources, L.L.C. only | Magnet Withers (Marginulina 1) | Wharton | 1 | 0 | 155K | May 2006 – Jan 2018 |
| Cockburn, H. C. G-3-244969 | Orx Resources, L.L.C. only | Magnet Withers (Marginulina 1) | Wharton | 1 | 0 | 176K | Apr 2008 – Jul 2019 |
| Cockburn, HC G-3-261233 | Orx Resources, L.L.C. only | Magnet Withers (Mio 4400) | Wharton | 1 | 0 | 0 | — |
| Cockburn G-13-272062 | Stonebriar Oil LLC only | Newark, East (Barnett Shale) | Wise | 1 | 0 | 129K | Jan 2012 – May 2013 |
| Cockburn G-13-272061 | Stonebriar Oil LLC only | Newark, East (Barnett Shale) | Wise | 1 | 0 | 220K | Jan 2012 – Jun 2015 |
| Cockburn, H. C., -A- G-3-7165 | McGowan Working Partners, Inc. only | Magnet Withers (Miocene 4200) | Wharton | 1 | 0 | 0 | — |
| Cockburn, H. C. G-3-88318 | Orx Resources, L.L.C. only | Magnet Withers (Miocene 4000) | Wharton | 1 | 0 | 217K | by Jan 1993 – Dec 1997 |
| Cockburn G-3-180260 | Resource Expl & Prod, Inc. only | Magnet Withers (Miocene 3900) | Wharton | 1 | 0 | 250K | Nov 2000 – Apr 2010 |
| Weakley-Cockburn Unit G-3-188255 | Blue Flame Operating Company LLC only | Magnet Withers (Miocene 2600) | Wharton | 1 | 0 | 24.7K | Mar 2002 – Dec 2011 |
| Berberish-Cockburn Unit G-3-188368 | Houston Gulf Energy Corporation only | Magnet Withers (Miocene 3600) | Wharton | 1 | 0 | 41.9K | Mar 2002 – Jun 2013 |
| Berberish-Cockburn Unit G-3-188369 | Blue Flame Operating Company LLC only | Magnet Withers (Miocene 3900) | Wharton | 1 | 0 | 741K | Mar 2002 – Nov 2018 |
| Cockburn, H. C. G-3-225171 | Orx Resources, L.L.C. only | Magnet Withers (Miocene 4000) | Wharton | 1 | 0 | 30.9K | Aug 2006 – Oct 2007 |
| Cockburn, H. C. G-3-281156 | Orx Resources, L.L.C. only | Magnet Withers (Heterostegina) | Wharton | 1 | 0 | 465 | Aug 2016 – Sep 2016 |