| Anderson O-3-21569 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 3 | 409K | 1.67M | Jan 1993 – Sep 2013 |
| Lois Williams O-3-27070 | Vess Oil Corporation only | Madisonville, W. (Woodbine -A-) | Brazos | 1 | 219K | 67.5K | Aug 2015 – Apr 2026 |
| J.M. Atkins Unit O-3-22146 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 2 | 219K | 1.99M | Aug 1993 – Oct 2005 |
| McDougal-Crant O-3-22100 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 1 | 195K | 216K | Apr 1993 – Nov 2009 |
| Grant-McDougal Unit O-3-21775 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 2 | 187K | 228K | Jan 1993 – Nov 2008 |
| Williams Ranch B O-3-24317 | Northfield Enterprises, Inc. only | Giddings (Austin Chalk-3) | Brazos | 1 | 153K | 69.7K | Aug 2002 – Apr 2026 |
| Agnello, Lebon O-3-15258 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 2 | 149K | 1.06M | Jan 1993 – Jul 2006 |
| Borski-Peters Unit O-3-21887 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 1 | 138K | 631K | Jan 1993 – Dec 2006 |
| McWilliams Unit O-3-21891 | 7711 Corporation, The only | Giddings (Austin Chalk-3) | Brazos | 1 | 137K | 368K | Jan 1993 – Jan 2002 |
| Zwiefel Unit O-3-22172 | Williams, Clayton Energy, Inc. only | Kurten (Buda) | Brazos | 1 | 122K | 58.8K | Sep 1993 – May 2012 |
| Williams Ranch O-3-20018 | Northfield Enterprises, Inc. only | Kurten (Buda) | Brazos | 6 | 113K | 108K | Jan 1993 – Jan 2022 |
| Anderson-Stephen Unit O-3-21896 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 1 | 104K | 374K | Jan 1993 – Jan 2012 |
| Peters Unit O-3-21867 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 1 | 103K | 675K | Jan 1993 – Jul 2006 |
| Williams G-3-143403 | Rme Petroleum Company only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 100K | 2.51M | Jan 1993 – Mar 2002 |
| Arhopulos-Brazos Unit G-3-144778 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 84.9K | 2.42M | Mar 1993 – Jul 2013 |
| Williams Minerals B O-3-26322 | Wildfire Energy Operating LLC only | Giddings (Buda) | Brazos | 1 | 80.7K | 35K | Dec 2012 – Mar 2026 |
| Morgan O-3-21897 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 2 | 74.5K | 471K | Jan 1993 – May 2013 |
| Williams Minerals C O-3-26356 | Wildfire Energy Operating LLC only | Giddings (Buda) | Brazos | 1 | 55.4K | 22.9K | Jun 2013 – Mar 2026 |
| Ashlock Unit O-3-21848 | Williams, Clayton Energy, Inc. only | Kurten (Buda) | Brazos | 1 | 51.5K | 30.9K | Jan 1993 – Jan 1997 |
| Williams Minerals O-3-25876 | Wildfire Energy Operating LLC only | Giddings (Buda) | Brazos | 1 | 47.8K | 14.6K | Feb 2012 – Mar 2026 |
| Arhopulos, T. J. G-3-146617 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 45.8K | 1.07M | Jul 1993 – Jul 2013 |
| Davis Unit O-3-21706 | Williams, Clayton Energy, Inc. only | Kurten (Buda) | Brazos | 1 | 45.5K | 31.8K | Jan 1993 – Aug 2001 |
| Williams, A.M. O-3-19489 | Cumming Company, Inc. The only | Kurten (Woodbine) | Brazos | 2 | 45.4K | 321 | Jan 1993 – Mar 2026 |
| Wise Unit O-3-22281 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 1 | 39.7K | 27.5K | Jun 1993 – Feb 1998 |
| Armstrong Unit O-3-21346 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 1 | 36.7K | 235K | Jan 1993 – Jan 2001 |
| McGruder-Anderson Unit O-3-21933 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 2 | 35.9K | 288K | Mar 1993 – Mar 2012 |
| Williams, A.M. Unit O-3-26548 | Cumming Company, Inc. The only | Kurten (Buda) | Brazos | 1 | 23.5K | 0 | Jun 2013 – Mar 2026 |
| Wintershall-Peters Unit O-3-21494 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 1 | 22.2K | 218K | Jan 1993 – Feb 2006 |
| A. M. Williams Unit 2 O-3-23931 | Impetro Operating LLC only | Kurten (Woodbine) | Brazos | 1 | 17.5K | 0 | Sep 2000 – May 2013 |
| McSwain-Glenn Unit O-3-15164 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 2 | 14.7K | 181K | Jan 1993 – Sep 1996 |
| Arhopulos-Crenshaw Unit G-3-147564 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 13.2K | 583K | Sep 1993 – Jul 2013 |
| Garza "B" Unit O-3-15641 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk-3) | Brazos | 2 | 11K | 175K | Jan 1993 – Dec 1999 |
| Wintershall-Arhopulos Unit G-3-141476 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 8.62K | 413K | Jan 1993 – Nov 1994 |
| McGruder-Anderson Unit O-3-21934 | Williams, Clayton Energy, Inc. only | Giddings (Buda) | Brazos | 1 | 7.35K | 15K | Mar 1993 – Mar 1993 |
| Garza B Unit G-3-148226 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 6.95K | 97.7K | Jun 1993 – Jul 1996 |
| Williams Unit G-3-236004 | Evolution Operating Co., Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 4.2K | 294K | Mar 2008 – Dec 2012 |
| Arhopulos-Brazos Unit G-3-144780 | Williams, Clayton Energy, Inc. only | Clay, N E. (Deep) | Brazos | 1 | 4.1K | 407K | Mar 1993 – Aug 1996 |
| Grant-McDougal Unit O-3-21774 | Williams, Clayton W., Jr., Inc. only | Kurten (Buda) | Brazos | 2 | 3.61K | 1.5K | Jan 1993 – Feb 1993 |
| Williams, A.M. Unit 2 O-3-17265 | Petrotex Engineering Company only | Kurten (Buda) | Brazos | 1 | 2.59K | 292 | Jan 1993 – Sep 2000 |
| Williams Unit G-3-190250 | Evolution Operating Co., Inc. only | Navasota River (Cretaceous Lwr.) | Brazos | 1 | 1.1K | 201K | May 2002 – Dec 2007 |
| Champion Realty Corporation O-3-19561 | Williams, Clayton Energy, Inc. only | Kurten (Austin Chalk) | Brazos | 1 | 160 | 10 | Jan 1993 – Oct 1993 |
| McGruder-Anderson Unit G-3-258034 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 5 | 3.6K | Oct 2010 – Sep 2013 |
| Wintershall-Arhopulos G-3-152796 | Williams, Clayton Energy, Inc. only | Giddings (Wilcox) | Brazos | 1 | 3 | 16.9K | Dec 1994 – Jan 1995 |
| McFarlane, J. W. G-3-99540 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 0 | 0 | — |
| Arhopulos, T. J. G-3-89261 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 0 | 0 | — |
| McSwain "a" Unit O-3-18413 | Williams, Clayton W., Jr., Inc. only | Giddings (Austin Chalk-3) | Brazos | 1 | 0 | 0 | — |
| McSwain "a" Unit G-3-143661 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 0 | 300 | Jan 1993 – Oct 1993 |
| Schultz Unit G-3-129520 | Williams, Clayton Energy, Inc. only | Aggieland (Wilcox 4400) | Brazos | 1 | 0 | 0 | — |
| Crown Ranch Unit G-3-129168 | Williams, Clayton Energy, Inc. only | Aggieland (Wilcox 4400) | Brazos | 1 | 0 | 0 | — |