| Buckley, Clifford Etal O-1-13742 | D.J.F. Services, Inc. only | Pearsall (Austin Chalk) | Frio | 1 | 182K | 18.6K | Aug 1993 – Apr 2026 |
| Poe, Clifford O-9-15362 | Kaiser-Francis Oil Company only | Poe (Goen Sand) | Runnels | 2 | 134K | 49.2K | Mar 2003 – Jul 2020 |
| Meadows-Clifford 31-30 ME EX G-14-284034 | Mmgl Txph, LLC only | Buffalo Wallow (Granite Wash) | Hemphill | 1 | 109K | 4.32M | Dec 2017 – Apr 2026 |
| Buckley, Clifford et Al O-1-12412 | Vanco Oil & Gas Corp. only | Pearsall (Austin Chalk) | Frio | 2 | 105K | 7.04K | by Jan 1993 – Feb 2020 |
| Meadows-Clifford 31-30 MD EX G-14-284212 | Mmgl Txph, LLC only | Buffalo Wallow (Granite Wash) | Hemphill | 1 | 104K | 10.5M | Nov 2017 – Apr 2026 |
| Clifford 30 G-14-261766 | Mmgl Txph, LLC only | Buffalo Wallow (Granite Wash) | Hemphill | 1 | 47.2K | 3.03M | Mar 2011 – Apr 2026 |
| Clifford Unit G-13-273388 | EOG Resources, Inc. only | Newark, East (Barnett Shale) | Cooke | 1 | 22K | 333K | Mar 2011 – Jul 2020 |
| Hierholzer, Clifford O-1-8393 | Aaronmark Services, LLC only | Higgins | Wilson | 1 | 18.9K | 42 | by Jan 1993 – Apr 2026 |
| Bouldin, Clifford O-8-837 | Tanglewood Oil & Gas Co. only | Coleman County Regular | Coleman | 14 | 15.2K | 15 | by Jan 1993 – Apr 2026 |
| Clifford Unit G-13-273387 | EOG Resources, Inc. only | Newark, East (Barnett Shale) | Cooke | 1 | 11.8K | 305K | Mar 2011 – Nov 2017 |
| Clifford 30 O-14-8706 | Mmgl Txph, LLC only | St. Clair (Kansas City) | Hemphill | 1 | 10.8K | 24.6K | May 2013 – Apr 2026 |
| Clifford 30 G-14-209403 | Mmgl Txph, LLC only | Buffalo Wallow (Granite Wash) | Hemphill | 1 | 9.88K | 735K | Sep 2004 – Oct 2017 |
| Taylor, Clifford O-13-24510 | Devon Energy Operating Co., L.P. only | Wise County Regular | Wise | 1 | 6.65K | 170K | by Jan 1993 – Aug 2002 |
| Swenson O-8-19510 | Swenson, Clifford E. only | Flat Top, South (Strawn) | Stonewall | 2 | 6.18K | 7.91K | by Jan 1993 – Oct 1996 |
| Hawthorne, Clifford M. G-3-160041 | Shana Petroleum Company only | Paul (LW-30) | Colorado | 1 | 5.98K | 175K | Aug 1996 – Dec 1997 |
| Hawthorne, Clifford M. G-3-166815 | Shana Petroleum Company only | Paul (LW-27) | Colorado | 1 | 4.91K | 184K | Jan 1998 – Jun 1999 |
| Hawthorne, Clifford M. G-3-173927 | Neg Operating LLC only | Paul (LW-22) | Colorado | 1 | 3.96K | 176K | Jul 1999 – May 2000 |
| Hawthorne, Clifford M. G-3-156529 | Shana Petroleum Company only | Paul (LW-54) | Colorado | 1 | 2.5K | 53.6K | Nov 1995 – Jul 1996 |
| Spies, Clifford F. G. U. #1 G-2-53255 | IP Well Service LLC only | Yorktown, S (Wilcox 11100) | De Witt | 1 | 2.36K | 346K | by Jan 1993 – Jun 2017 |
| Swenson O-8-20273 | Swenson, Clifford E. only | Flat Top, South (Swastika) | Stonewall | 1 | 2.21K | 1.38K | by Jan 1993 – Oct 1996 |
| Heirholzer, Clifford O-1-9177 | Wen-BE only | Higgins (Escondido) | Wilson | 1 | 1.89K | 37 | by Jan 1993 – Jul 1999 |
| Clifford G-14-191504 | Mmgl Txph, LLC only | Buffalo Wallow (Granite Wash) | Hemphill | 1 | 1.69K | 184K | Aug 2002 – Apr 2026 |
| Clifford 30 G-14-209476 | Mmgl Txph, LLC only | Buffalo Wallow (Granite Wash) | Hemphill | 1 | 1.42K | 121K | May 2005 – Jul 2011 |
| Clifford F. Spies Gas Unit 1 G-2-174916 | IP Well Service LLC only | Yorktown, S (Wilcox 11100) | De Witt | 1 | 1.28K | 139K | Aug 1999 – Mar 2022 |
| Loreant, Clifford G-5-190008 | Diversified Production LLC only | Bald Prairie (CV Consolidated) | Robertson | 1 | 1.23K | 663K | Jul 2002 – Apr 2026 |
| Hawthorne, Clifford M. G-3-180600 | Neg Operating LLC only | Paul (LW-20) | Colorado | 1 | 1.14K | 36K | Mar 2001 – Feb 2003 |
| Frost National Bank Trustee G-2-100239 | Atkinson, Clifford III only | Ray Point, West | Live Oak | 1 | 1.01K | 128K | by Jan 1993 – Mar 1995 |
| Clifford Williams O-11-69938 | Strawn Energy Services, LLC only | Garza, East (Glorieta) | Garza | 1 | 944 | 0 | Dec 2013 – Oct 2023 |
| Spies, Clifford F. G. U. #1 G-2-59225 | IP Well Service LLC only | Yorktown, S (Wilcox 11100) | De Witt | 1 | 902 | 134K | Oct 2000 – Mar 2017 |
| Loreant, Clifford G-5-174251 | Diversified Production LLC only | Bald Prairie (CV Consolidated) | Robertson | 1 | 517 | 1.08M | Aug 1999 – Apr 2026 |
| Wilson, Clifford O-8-27307 | Gresham Oil & Gas (USA) Inc. only | Nolan County Regular | Nolan | 1 | 385 | 2 | Oct 1994 – Nov 1994 |
| Loreant, Clifford G-5-111317 | Diversified Production LLC only | Bald Prairie (CV Consolidated) | Robertson | 1 | 330 | 2.97M | by Jan 1993 – Apr 2026 |
| Porter, Clifford O-13-27025 | Devon Energy Production Co, L.P. only | Caughlin (Strawn) | Wise | 1 | 317 | 548 | by Jan 1993 – May 1993 |
| Clifford T Adams O-3-26715 | Interstate Explorations LLC only | Ft. Trinidad,s.(ottos Sand) | Houston | 1 | 268 | 0 | Oct 2013 – Feb 2014 |
| Pippen, Clifford O-8-21614 | Cuatro Oil and Gas Corporation only | Pippen (Caddo) | Eastland | 1 | 107 | 10 | Feb 1993 – Feb 1994 |
| Hierholzer, Clifford O-1-1969 | Southwest Production Mgmt. Co. only | Bowman (Reklaw) | Wilson | 2 | 105 | 7 | Feb 1993 – Aug 1993 |
| Smith, Clifford L. G-8-89132 | 3 S Production, Inc. only | Foster (Marble Falls) | Eastland | 1 | 90 | 163K | by Jan 1993 – Apr 2026 |
| Jack Clifford-Satterwhite G-8-123324 | Wells Oilfield Services, Inc. only | Wayland, SE (Duffer Lime, Lower) | Stephens | 1 | 63 | 35.4K | by Jan 1993 – Feb 1998 |
| Perkins -B- O-13-18785 | Swenson, Clifford E. only | Clay County Regular | Clay | 6 | 49 | 20 | by Jan 1993 – Dec 1996 |
| Frey, Clifford O-9-8753 | B & M Oil Field Services only | Beddo, East (Serratt) | Runnels | 1 | 47 | 61 | by Jan 1993 – Mar 1998 |
| Smith, Clifford L. G-8-89133 | Crt's, Inc. only | Foster (Marble Falls) | Eastland | 1 | 18 | 24.6K | by Jan 1993 – Feb 2001 |
| Jack Clifford-Satterwhite G-8-121857 | Squyres Oil Co., Inc. only | Wayland, SE (Duffer Lime, Lower) | Stephens | 1 | 1 | 24.6K | by Jan 1993 – Jul 1996 |
| Owen, S. Clifford G-4-54529 | Mesa Operating Ltd Partnership only | H. E. Clark (Olmos) | Webb | 1 | 0 | 0 | — |
| Clifford, T GU G-13-235156 | Formentera Operations LLC only | Newark, East (Barnett Shale) | Johnson | 1 | 0 | 974K | Sep 2007 – Apr 2026 |
| Holland, Clifford G-8-100796 | Chaw only | Skaggs (Duffer) | Comanche | 1 | 0 | 0 | — |
| Frost National Bank, Trustee O-2-7402 | Atkinson, Clifford III only | Wildcat | Live Oak | 2 | 0 | 0 | — |
| Clifford, N. M. -A- O-8-5558 | Fry, Douglas only | Callahan County Regular | Callahan | 2 | 0 | 0 | — |
| Clifford G-14-49788 | Chevron U. S. A. Inc. only | Buffalo Wallow (Morrow) | Hemphill | 1 | 0 | 1.21M | by Jan 1993 – Jul 2002 |
| Hawthorne, Clifford M. G-3-136854 | Neg Operating LLC only | Paul (LW-18) | Colorado | 1 | 0 | 0 | — |
| Poe, Clifford O-9-16733 | Kaiser-Francis Oil Company only | Norton, N. (Capps) | Runnels | 1 | 0 | 0 | — |