| Gillespie O-13-33956 | Trio Consulting & Management,llc only | Q.I.S.D. (Chappel) | Hardeman | 1 | 28.6K | 0 | Aug 2019 – Aug 2026 |
| Boone Unit O-13-30690 | Avalanche Oil & Gas LLC only | Caitlin (Chappel) | Wilbarger | 1 | 27.8K | 0 | Jan 2006 – Jun 2020 |
| Hendrix O-13-33226 | Trio Consulting & Management,llc only | Early Reprieve (Chappel) | Hardeman | 1 | 27.6K | 52.4K | Jun 2015 – Aug 2026 |
| Howard "D" O-13-25833 | Dimock Operating Company only | Hurt Dog (Chappel) | Hardeman | 1 | 26.9K | 5.23K | by Jan 1993 – Mar 2006 |
| Langford "25" O-13-24739 | Eagle Hydrocarbons (Texas) Inc. only | Quanah Centennial (Chappel) | Hardeman | 1 | 25.2K | 17.8K | by Jan 1993 – Jun 2011 |
| Farr O-13-28797 | TC Oil and Gas, LLC only | Betty Lou (Miss-Chappel Lime) | Baylor | 1 | 23.8K | 3 | May 1994 – Aug 2016 |
| Summerlee Unit O-13-30492 | Assent Energy Partners, LLC only | Stepp (Chappel) | Hardeman | 1 | 23.8K | 0 | Sep 2004 – Jul 2020 |
| Neal, Bill 321 O-13-28924 | Key Energy of Colorado, Inc. only | Dead Dog (Chappel) | Hardeman | 1 | 23.7K | 504 | Dec 1994 – Apr 1999 |
| Judd 399 O-13-29087 | Assent Energy Partners, LLC only | Right Choice (Chappel) | Hardeman | 1 | 23.1K | 1 | Jan 1996 – Dec 2013 |
| FD/Allred-Evans Heirs O-13-29451 | TLM Energy, LLC only | Harco (Chappel) | Hardeman | 1 | 21.8K | 47.9K | Jan 1998 – Jun 2025 |
| Summerlee -A- O-13-30541 | Assent Energy Partners, LLC only | Stepp (Chappel) | Hardeman | 1 | 21.2K | 0 | Jul 2005 – Aug 2026 |
| Sauls O-13-30185 | Foree Oil Company only | Sauls (Chappel) | Hardeman | 1 | 21K | 0 | Jul 2003 – Feb 2006 |
| Turner Unit O-13-30093 | Key Energy of Colorado, Inc. only | Down Under (Chappel) | Hardeman | 1 | 20.7K | 259K | Jul 2002 – Jul 2003 |
| Hatcher, Ruth O-13-30581 | Trek Resources, Inc. only | Harco (Chappel) | Hardeman | 1 | 20.3K | 11.6K | Jan 2006 – Dec 2012 |
| Ferrell-Fox Unit O-8-25350 | Chapparal Operating Co. only | Crawford (Marble Falls) | Eastland | 1 | 19.2K | 8.17K | by Jan 1993 – Aug 2026 |
| Carpenter Unit O-13-28135 | Trio Operating Company, Inc. only | Springbok (Chappel) | Hardeman | 1 | 18.8K | 21 | by Jan 1993 – Aug 1997 |
| Holcomb, V. O-13-7905 | Pitcock, Inc. only | Karran (Chappel) | Young | 1 | 17.9K | 21 | by Jan 1993 – Apr 2016 |
| Chappell, Naomi Clarke O-2-3119 | Goldston Oil Corporation only | Gabrysch (6300) | Jackson | 1 | 17.7K | 3.53K | by Jan 1993 – May 1996 |
| Porter-Farr O-13-27606 | TB Petroleum, LLC only | Betty Lou (Miss-Chappel Lime) | Baylor | 1 | 17.3K | 57 | by Jan 1993 – Jan 2022 |
| Turner Unit G-13-199673 | Key Energy of Colorado, Inc. only | Down Under (Chappel) | Hardeman | 1 | 17K | 389K | Jul 2003 – Mar 2010 |
| Huie-Emerson No. 2 Oil Unit O-13-29022 | Thompson, Richard W. Inc. only | Huie-Emerson Cox (Chappel) | Hardeman | 1 | 16K | 339 | Jul 1995 – Jan 1997 |
| Judd O-13-30139 | Key Energy of Colorado, Inc. only | Stepp (Chappel) | Hardeman | 1 | 15.5K | 0 | Aug 2002 – Jan 2004 |
| Haynes Unit O-13-30095 | Key Energy of Colorado, Inc. only | Quanah (Chappel) | Hardeman | 1 | 15.2K | 0 | Oct 2002 – Sep 2011 |
| Wells, Hyson O-13-18377 | Key Energy of Colorado, Inc. only | Groesbeck Creek (Chappel) | Hardeman | 1 | 14.5K | 18.1K | by Jan 1993 – Sep 1998 |
| J & J Ranch Unit O-13-30364 | Key Energy of Colorado, Inc. only | Rockview (Chappel) | Hardeman | 1 | 14.4K | 0 | Dec 2003 – Apr 2004 |
| Walker-Buckler 72 O-8-19346 | Sojourner Drilling Corporation only | Rockwell (Chappel, Miss.) | Shackelford | 1 | 13.1K | 18K | Jun 1993 – Oct 2025 |
| Chappell O-9-7070 | Quail Ridge Petroleum LLC only | Jameson (Strawn) | Coke | 1 | 13.1K | 3.11K | by Jan 1993 – Aug 2026 |
| Brooks O-13-27683 | Masada Oil & Gas only | Brooks (Chappel) | Hardeman | 1 | 12.8K | 1.88K | by Jan 1993 – Jul 2001 |
| Georgia-Pacific O-13-34133 | Sutherland Energy Co., LLC only | Quanah (Chappel) | Hardeman | 1 | 12.1K | 0 | Sep 2022 – Aug 2026 |
| Chappell, J. Ellwood -C- O-9-627 | Quail Ridge Petroleum LLC only | Jameson (Strawn) | Coke | 3 | 11.9K | 107K | by Jan 1993 – Aug 2026 |
| Pursley, C. E. O-13-25625 | Burns, P. C. Oil Producers Inc. only | Lawler (Chappel) | Hardeman | 1 | 9.16K | 19 | by Jan 1993 – Jan 1996 |
| King Unit O-13-31442 | Trio Consulting & Management,llc only | Quanah (Chappel) | Hardeman | 1 | 9.08K | 7 | Mar 2009 – Jun 2016 |
| Durham Farms Unit O-13-30262 | Assent Energy Partners, LLC only | Quanah (Chappel) | Hardeman | 1 | 8.56K | 0 | Dec 2003 – Aug 2026 |
| Embry O-13-33889 | Mito Resources TX LLC only | Down Under (Chappel) | Hardeman | 1 | 8.54K | 1.14K | Apr 2019 – Aug 2026 |
| Stepp 110 O-13-31159 | Trio Consulting & Management,llc only | Stepp (Chappel) | Hardeman | 1 | 8.22K | 0 | Apr 2007 – Aug 2026 |
| Thomason, Worth O-8-21570 | Lawrence Energy Company only | Thrifty, S. (Chappel Reef) | Brown | 1 | 7.93K | 1.82K | by Jan 1993 – Jul 2026 |
| Furr Robinson -E O-13-27643 | Embassy Oil Company only | Farmer (Miss. Chappel Lime) | Archer | 1 | 7.65K | 56 | by Jan 1993 – Dec 1997 |
| Georgia Pacific B O-13-23573 | Madison Oil Co.-Halbouty, M. T. only | Quanah (Chappel 8295) | Hardeman | 1 | 7.09K | 699 | by Jan 1993 – Oct 1996 |
| Randel - Raschke Unit "52" O-13-29304 | Key Energy of Colorado, Inc. only | Piarist, SW. (Chappel, Up.) | Wilbarger | 1 | 6.41K | 0 | Oct 1996 – Aug 1998 |
| Hurst O-13-29853 | Key Energy of Colorado, Inc. only | Stepp (Chappel) | Hardeman | 1 | 6.21K | 131 | Dec 2000 – Dec 2000 |
| Little Creek "B" O-13-27086 | D L Operating only | Little Creek-Chappel (Miss.) | Young | 1 | 5.97K | 1.58K | by Jan 1993 – Aug 2026 |
| Hurst 11 O-13-29055 | Key Energy of Colorado, Inc. only | Stepp (Chappel) | Hardeman | 2 | 5.96K | 48 | Jun 1995 – Nov 2011 |
| Phillips, A. W. & Ivy O-13-23364 | Ferguson, S. M. Jr., Inc. only | Piarist, SW. (Chappel, Up.) | Hardeman | 1 | 5.78K | 139 | by Jan 1993 – Nov 2004 |
| Holcomb O-13-30440 | Holmes Exploration, LLC only | Quanah, E. (Chappel) | Hardeman | 1 | 5.71K | 0 | Mar 2005 – Aug 2006 |
| Summerlee -B- O-13-30542 | Assent Energy Partners, LLC only | Stepp (Chappel) | Hardeman | 1 | 5.71K | 0 | Jul 2004 – Nov 2007 |
| Bottoms "11" O-13-25339 | Enserch Exploration, Inc only | Full Interest (Chappel) | Hardeman | 1 | 5.6K | 4.51K | by Jan 1993 – Sep 1994 |
| Nantz O-13-26975 | Creswell, Chris only | Karran (Chappel) | Young | 1 | 5.56K | 7.29K | by Jan 1993 – Jan 1999 |
| Holcomb O-8-26092 | Levisay Operating Co. only | Chapparal (Caddo) | Brown | 1 | 5.53K | 26.9K | by Jan 1993 – Jun 2025 |
| Holcomb "B" O-13-23430 | Hill, R.M. Operating Inc. only | Karran (Chappel) | Young | 2 | 5.46K | 26 | by Jan 1993 – May 1998 |
| Holcomb "D" O-13-25312 | Tri Petro Oil & Gas Corp. only | Karran (Chappel) | Young | 1 | 5.11K | 11.9K | by Jan 1993 – Oct 2001 |