| Welder, J. F. Heirs -F- G-4-47222 | Columbus Energy, LLC only | Seven Sisters, East (10000) | Duval | 1 | 16.9K | 3.03M | by Jan 1993 – Mar 2021 |
| Henderson-State O-4-13973 | Columbus Energy, LLC only | Labbe | Duval | 1 | 6.56K | 0 | Jan 2016 – Aug 2026 |
| Arco et al-Humble Fee G-4-48643 | Columbus Energy, LLC only | Seven Sisters, East ( 9500) | Duval | 1 | 3.85K | 3.6M | by Jan 1993 – Aug 2026 |
| Oryx G-4-204954 | Columbus Energy, LLC only | Govt. Wells, N. (1ST Reagan) | Duval | 1 | 2.86K | 496K | Oct 2004 – Aug 2019 |
| Arco et al Humble Fee Gas Unit G-4-248270 | Columbus Energy, LLC only | Seven Sisters, E. (Reagan B) | Duval | 1 | 1.34K | 1.95M | Feb 2009 – Jun 2018 |
| Armistead G-4-153162 | Columbus Energy, LLC only | Government Wells, N. (11500) | Duval | 1 | 1.3K | 1.58M | Feb 1995 – Nov 2010 |
| Oryx G-4-147843 | Columbus Energy, LLC only | Government Wells, N. (11500) | Duval | 1 | 785 | 2.62M | Feb 1994 – Oct 2019 |
| Welder 385 G-4-210308 | Columbus Energy, LLC only | Seven Sisters, East ( 9500) | Duval | 1 | 645 | 810K | Apr 2005 – Aug 2026 |
| Humble Fee Gas Unit G-4-221133 | Columbus Energy, LLC only | Seven Sisters, E.(2ND Massive) | Duval | 1 | 462 | 112K | Mar 2006 – Sep 2008 |
| Welder Lease G-4-102473 | Columbus Energy, LLC only | Seven Sisters, E. (Reagan) | Duval | 1 | 187 | 1.3M | by Jan 1993 – Aug 2026 |
| Arco Etal Humble Fee Gas Unit G-4-101266 | Columbus Energy, LLC only | Seven Sisters, E. (Howell Sand) | Duval | 1 | 164 | 19.2M | by Jan 1993 – Aug 2026 |
| Gorman Gas Unit G-4-157260 | Columbus Energy, LLC only | Seven Sisters, E. (House AB) | Duval | 1 | 131 | 3.14M | Feb 1996 – Jul 2026 |
| Hazlewood Gas Unit G-4-106182 | Columbus Energy, LLC only | Seven Sisters, E. (Howell Sand) | Duval | 1 | 115 | 11.1M | by Jan 1993 – Aug 2026 |
| Hazelwood Gas Unit G-4-124751 | Columbus Energy, LLC only | Seven Sisters, E. (Reagan Seg 1) | Duval | 1 | 70 | 2.18M | by Jan 1993 – Aug 2026 |
| Gorman, J. W. Gas Unit G-4-94447 | Columbus Energy, LLC only | Seven Sisters, E. (Howell Sand) | Duval | 1 | 42 | 7.43M | by Jan 1993 – Apr 2019 |
| Humble Fee Gas Unit G-4-197743 | Columbus Energy, LLC only | Seven Sisters, E. (House AB) | Duval | 1 | 41 | 1.57M | Oct 2003 – Jan 2022 |
| Humble Fee Gas Unit G-4-220102 | Columbus Energy, LLC only | Seven Sisters, E. (House AB) | Duval | 1 | 35 | 1.8M | Feb 2006 – Aug 2026 |
| Arco et al Humble Fee Gas Unit G-4-285507 | Columbus Energy, LLC only | Seven Sisters, E. (Reagan) | Duval | 1 | 12 | 765K | Jul 2018 – Aug 2026 |
| Hazlewood Gas Unit G-4-110633 | Columbus Energy, LLC only | Seven Sisters, E. (House AB) | Duval | 1 | 9 | 4.06M | by Jan 1993 – Jan 2015 |
| Oryx G-4-185878 | Columbus Energy, LLC only | Government Wells (Wilcox 7700) | Duval | 1 | 9 | 6.1K | Jun 2006 – Aug 2008 |
| Hazlewood Gas Unit G-4-108578 | Columbus Energy, LLC only | Seven Sisters, East (0-55) | Duval | 1 | 7 | 3.67M | by Jan 1993 – Oct 2016 |
| Hahl, C. W. Fee G-4-148318 | Columbus Energy, LLC only | Government Wells, N. (11500) | Duval | 1 | 3 | 981K | Jan 1994 – Nov 2014 |
| Humble Fee Gas Unit G-4-201475 | Columbus Energy, LLC only | Seven Sisters, E. (House C) | Duval | 1 | 0 | 130K | Aug 2003 – Oct 2003 |
| Arco Humble Fee G-4-217459 | Columbus Energy, LLC only | Seven Sisters, East (10000) | Duval | 1 | 0 | 3.1K | Nov 2005 – May 2006 |
| Lichtenberger, A. O-4-10592 | Columbus Energy, LLC only | Seven Sisters | Duval | 1 | 0 | 0 | — |
| Hazlewood Gas Unit G-4-102892 | Columbus Energy, LLC only | Seven Sisters, E. (Howell Sand) | Duval | 1 | 0 | 38K | May 1993 – Mar 2005 |
| Welder, J. F. G-4-60122 | Columbus Energy, LLC only | Seven Sisters, East (10000) | Duval | 1 | 0 | 0 | — |
| Arco-Humble Fee Gas Unit G-4-208235 | Columbus Energy, LLC only | Seven Sisters, East ( 9500) | Duval | 1 | 0 | 46.5K | Feb 2005 – Aug 2014 |
| Doran-State O-4-1434 | Columbus Energy, LLC only | Labbe (Cole Sand) | Duval | 5 | 0 | 0 | — |
| Humble Fee Gas Unit G-4-218000 | Columbus Energy, LLC only | Seven Sisters, E. (House C) | Duval | 1 | 0 | 57.3K | Nov 2005 – Feb 2006 |
| Hahl, C. W. Fee G-4-181713 | Columbus Energy, LLC only | Wildcat | Duval | 1 | 0 | 0 | — |