| Columbus Field Unit O-3-24040 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 38 | 1.11M | 3.82M | Sep 2001 – Aug 2026 |
| Columbus Field Unit O-3-784 | Devon Energy Operating Co., L.P. only | Columbus | Colorado | 33 | 571K | 834K | by Jan 1993 – Aug 2001 |
| Columbus Field Unit O-3-785 | Devon Energy Operating Co., L.P. only | Columbus (11-A) | Colorado | 10 | 351K | 474K | by Jan 1993 – Aug 2001 |
| Columbus Field Unit O-3-23072 | Devon Energy Operating Co., L.P. only | Columbus ( 6-E) | Colorado | 3 | 97.8K | 120K | Sep 1996 – Aug 2001 |
| Columbus Field Unit G-3-207033 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 1 | 55.3K | 110K | Dec 2004 – Aug 2026 |
| Columbus Field Unit G-3-169484 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 1 | 54.1K | 914K | Jul 1998 – Aug 2024 |
| Columbus Field Unit G-3-171273 | Devon Energy Production Co, L.P. only | Columbus (Consolidated) | Colorado | 1 | 29.5K | 1.09M | Oct 1998 – Feb 2006 |
| Hill G-3-260820 | C & E Operating, Inc. only | Glasscock (Cockfield) | Colorado | 1 | 24.6K | 83.5K | Oct 2010 – Feb 2015 |
| Columbus Field Unit O-3-20372 | Devon Energy Operating Co., L.P. only | Columbus (5-C) | Colorado | 2 | 23.7K | 57.7K | by Jan 1993 – Aug 2001 |
| Columbus Field Unit O-3-20702 | Devon Energy Operating Co., L.P. only | Columbus (11-D) | Colorado | 3 | 21.8K | 158K | by Jan 1993 – Aug 2001 |
| Columbus Field Unit G-3-129021 | Mitchell Energy Company L.P. only | Columbus | Colorado | 1 | 20.5K | 1.8M | by Jan 1993 – Aug 2001 |
| Columbus Field Unit G-3-171256 | Devon Energy Production Co, L.P. only | Columbus (Consolidated) | Colorado | 1 | 19.9K | 745K | Sep 1998 – Sep 2006 |
| Columbus Field Unit G-3-164037 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 1 | 19.6K | 823K | Aug 1997 – Oct 2004 |
| Columbus Field Unit G-3-138600 | OXY USA Inc. only | Columbus (11-D) | Colorado | 1 | 17K | 652K | by Jan 1993 – Feb 1997 |
| Columbus Field Unit G-3-170788 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 1 | 14.5K | 831K | Sep 1998 – Aug 2013 |
| Columbus Field Unit G-3-127433 | Mitchell Energy Corporation only | Columbus (11-A) | Colorado | 1 | 13.6K | 252K | by Jan 1993 – Jul 1998 |
| Columbus Field Unit G-3-169593 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 1 | 10.3K | 788K | Aug 1998 – Aug 2026 |
| Columbus Field Unit G-3-147736 | OXY USA Inc. only | Columbus ( 8-A) | Colorado | 1 | 10.3K | 281K | Nov 1993 – Oct 1994 |
| Columbus Field Unit O-3-23615 | Devon Energy Operating Co., L.P. only | Columbus ( 7-E) | Colorado | 1 | 9.05K | 39.7K | Nov 1998 – Aug 2001 |
| Cooper, Elsie Penfield G-3-94745 | Cabot Oil & Gas Corporation only | Easter, South (9000) | Colorado | 1 | 8.34K | 512K | by Jan 1993 – Jul 2002 |
| Columbus Field Unit G-3-179446 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 1 | 7.59K | 976K | Jul 2000 – Aug 2026 |
| Columbus Field Unit G-3-174913 | Devon Energy Production Co, L.P. only | Columbus (Consolidated) | Colorado | 1 | 7.21K | 275K | Sep 1999 – Sep 2006 |
| Columbus Field Unit G-3-5816 | Devon Energy Production Co, L.P. only | Columbus (Consolidated) | Colorado | 1 | 7.02K | 445K | by Jan 1993 – Apr 2005 |
| Lehrer Estate G-3-180014 | Dewbre Petroleum Corporation only | Frnka (Cockfield 6400) | Colorado | 1 | 6.89K | 199K | Nov 2000 – Dec 2009 |
| Columbus Field Unit G-3-129342 | Mitchell Energy Corporation only | Columbus ( 7-E) | Colorado | 1 | 5.83K | 438K | by Jan 1993 – Mar 1999 |
| Columbus Field Unit G-3-129078 | Mitchell Energy Company L.P. only | Columbus ( 6-C, South) | Colorado | 1 | 5.72K | 446K | Jul 1994 – Aug 2001 |
| Columbus Field Unit G-3-179740 | Devon Energy Operating Co., L.P. only | Columbus (Consolidated) | Colorado | 1 | 5.49K | 94.4K | Aug 2000 – Apr 2002 |
| Glasscock "A" O-3-25425 | Proline Energy Resources Inc only | Glasscock (Cockfield 4400-a- SD) | Colorado | 1 | 5.36K | 4.59K | Jul 2003 – Jan 2019 |
| Columbus Field Unit G-3-175650 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 1 | 4.92K | 345K | Jan 2000 – Aug 2026 |
| Columbus Field Unit G-3-173112 | Daylight Petroleum LLC only | Columbus (Consolidated) | Colorado | 1 | 4.76K | 252K | Apr 1999 – Sep 2019 |
| Columbus Field Unit G-3-174793 | Devon Energy Production Co, L.P. only | Columbus (Consolidated) | Colorado | 1 | 4.5K | 123K | Aug 1999 – Dec 2004 |
| Hill O-3-26923 | C & E Operating, Inc. only | Glasscock (Cockfield) | Colorado | 1 | 4.41K | 0 | Mar 2015 – Jan 2016 |
| Columbus Field Unit G-3-173562 | Devon Energy Operating Co., L.P. only | Columbus (Consolidated) | Colorado | 1 | 4.3K | 311K | May 1999 – Jul 2002 |
| Columbus Field Unit G-3-171940 | Devon Energy Production Co, L.P. only | Columbus (Consolidated) | Colorado | 1 | 4.26K | 343K | Dec 1998 – May 2005 |
| Columbus Field Unit O-3-22022 | Mitchell Energy Company L.P. only | Columbus ( 6-a Wilcox) | Colorado | 1 | 3.8K | 34.9K | Mar 1993 – Jun 1995 |
| Columbus Field Unit G-3-40541 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 1 | 3.35K | 188K | by Jan 1993 – Nov 2020 |
| Columbus Field Unit G-3-162908 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 1 | 3.1K | 678K | Apr 1997 – Nov 2020 |
| Columbus Field Unit G-3-162283 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 1 | 2.97K | 267K | Feb 1997 – Sep 2005 |
| Columbus Field Unit G-3-129343 | Mitchell Energy Corporation only | Columbus (11-D & 11-F-S) | Colorado | 1 | 2.95K | 140K | Jun 1993 – May 2000 |
| Columbus Field Unit O-3-22244 | Mitchell Energy Company L.P. only | Columbus (6750 Wilcox) | Colorado | 2 | 2.63K | 2.01K | Oct 1993 – Jul 1994 |
| Columbus Field Unit G-3-137355 | OXY USA Inc. only | Columbus (11-D) | Colorado | 1 | 2.6K | 179K | by Jan 1993 – Apr 1997 |
| Columbus Field Unit G-3-136062 | Mitchell Energy Corporation only | Columbus (12-F) | Colorado | 1 | 2.4K | 90.6K | by Jan 1993 – Jun 1998 |
| Columbus Field Unit G-3-140408 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 1 | 2.37K | 90.5K | by Jan 1993 – May 2011 |
| Columbus Field Unit G-3-174920 | Rusk Energy Operating LLC only | Columbus (Consolidated) | Colorado | 1 | 2.28K | 189K | Oct 1999 – Nov 2020 |
| Columbus Field Unit G-3-129401 | Mitchell Energy Company L.P. only | Columbus ( 6-D Wilcox) | Colorado | 1 | 2.24K | 265K | Aug 1993 – Mar 1998 |
| Glasscock A G-3-235896 | C & E Operating, Inc. only | Glasscock (Cockfield) | Colorado | 1 | 2.06K | 410K | Feb 2008 – Feb 2018 |
| Columbus Field Unit G-3-128976 | Mitchell Energy Company L.P. only | Columbus (5-E Wilcox) | Colorado | 1 | 2.05K | 315K | by Jan 1993 – Dec 1999 |
| Butler G-3-263197 | C & E Operating, Inc. only | Glasscock (Cockfield) | Colorado | 1 | 2.03K | 310K | Jan 2011 – Feb 2015 |
| Columbus Field Unit G-3-140831 | Mitchell Energy Corporation only | Columbus (11-D) | Colorado | 1 | 1.95K | 45.2K | by Jan 1993 – Sep 1994 |
| Columbus Field Unit G-3-160046 | Mitchell Energy Corporation only | Columbus ( 6-J) | Colorado | 1 | 1.68K | 42.3K | Aug 1996 – May 1999 |