| Anderson O-3-21569 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Brazos | 3 | 409K | 1.67M | Jan 1993 – Aug 2014 |
| Milberger Unit O-3-22604 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Burleson | 1 | 280K | 117K | Dec 1994 – Feb 2005 |
| Shiner Heirs O-1-10412 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | Frio | 12 | 222K | 30.3K | Jan 1993 – Feb 2015 |
| J.M. Atkins Unit O-3-22146 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Brazos | 2 | 219K | 1.99M | Aug 1993 – May 2007 |
| Flowers Plantation Unit O-3-22807 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Robertson | 1 | 212K | 53.7K | Aug 1995 – Feb 2000 |
| Porter-Bowden Unit O-3-22957 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Burleson | 1 | 207K | 312K | Feb 1996 – Dec 2003 |
| McDougal-Crant O-3-22100 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Brazos | 1 | 195K | 216K | Apr 1993 – Mar 2015 |
| Grant-McDougal Unit O-3-21775 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Brazos | 2 | 187K | 228K | Jan 1993 – Feb 2014 |
| Agnello, Lebon O-3-15258 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Brazos | 2 | 149K | 1.06M | Jan 1993 – May 2007 |
| Borski-Peters Unit O-3-21887 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Brazos | 1 | 138K | 631K | Jan 1993 – Jul 2014 |
| Zwiefel Unit O-3-22172 | Williams, Clayton Energy, Inc. | Kurten (Buda) | Brazos | 1 | 122K | 58.8K | Sep 1993 – Feb 2015 |
| Alliance Trust Unit O-5-3471 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-5) | Robertson | 1 | 106K | 44.9K | Nov 1993 – Dec 1994 |
| Anderson-Stephen Unit O-3-21896 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Brazos | 1 | 104K | 374K | Jan 1993 – Oct 2013 |
| Peters Unit O-3-21867 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Brazos | 1 | 103K | 675K | Jan 1993 – Mar 2014 |
| Baker, James A. O-1-12491 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | Frio | 2 | 84.8K | 141K | Jan 1993 – Oct 1996 |
| Morgan O-3-21897 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Brazos | 2 | 74.5K | 471K | Jan 1993 – Aug 2014 |
| Kincaid O-1-12402 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | Frio | 2 | 72.6K | 75.4K | Jan 1993 – Feb 2001 |
| Paradise O-1-4664 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | Frio | 12 | 67.4K | 21 | Jan 1993 – Apr 1997 |
| Supak-Royall Unit O-3-24015 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Milam | 1 | 64.8K | 13.8K | Apr 2001 – May 2012 |
| Hudson-Destefano Unit O-3-22729 | Williams, Clayton Energy, Inc. | Giddings (Buda) | Robertson | 1 | 54.3K | 27.9K | Apr 1995 – Mar 2008 |
| Burns "E" O-1-12806 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | La Salle | 2 | 54.1K | 37.2K | Jan 1993 – Mar 2015 |
| Woodward-Burns O-1-12684 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | Frio | 2 | 54.1K | 21 | Jan 1993 – Apr 2013 |
| Ashlock Unit O-3-21848 | Williams, Clayton Energy, Inc. | Kurten (Buda) | Brazos | 1 | 51.5K | 30.9K | Jan 1993 – Jan 1999 |
| Brown - Accurso Unit O-3-21044 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Burleson | 1 | 47.7K | 375K | Jan 1993 – Apr 2017 |
| Fee -A- O-1-4946 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | Frio | 15 | 47.6K | 21 | Jan 1993 – Apr 2015 |
| Davis Unit O-3-21706 | Williams, Clayton Energy, Inc. | Kurten (Buda) | Brazos | 1 | 45.5K | 31.8K | Jan 1993 – May 2002 |
| Pete Scarmardo Unit O-3-20984 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Burleson | 1 | 45K | 168K | Jan 1993 – Jul 2008 |
| Gold, Mary "A" O-3-15216 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Burleson | 2 | 41.4K | 420K | Jan 1993 – Jul 2001 |
| Wise Unit O-3-22281 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Brazos | 1 | 39.7K | 27.5K | Jun 1993 – May 1998 |
| Nicholson Unit O-1-12754 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | Frio | 1 | 39K | 26K | Jan 1993 – Mar 2015 |
| Armstrong Unit O-3-21346 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Brazos | 1 | 36.7K | 235K | Jan 1993 – Apr 2001 |
| Krause, A.M. O-3-20225 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Lee | 1 | 36.7K | 3.45K | Jan 1993 – Mar 2015 |
| McGruder-Anderson Unit O-3-21933 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Brazos | 2 | 35.9K | 288K | Mar 1993 – Nov 2017 |
| Shiner Ranch -B- O-1-11540 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | Frio | 2 | 33K | 21 | Jan 1993 – May 2015 |
| Eagleton Unit O-3-22583 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Burleson | 1 | 30.4K | 10.1K | Nov 1994 – Nov 2001 |
| Kainer, L. A. et Al O-3-21810 | Williams, Clayton Energy, Inc. | Hutchins-Kubela (Kubela Sand) | Wharton | 1 | 29.6K | 21 | Jan 1993 – Mar 2002 |
| Burns "H" O-1-12715 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | La Salle | 2 | 29.4K | 65.2K | Jan 1993 – Apr 2015 |
| Howell-Ncnb Unit O-1-12790 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | Frio | 1 | 28.5K | 33.9K | Jan 1993 – Oct 1998 |
| Burns "H-D State" Unit O-1-13468 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | La Salle | 1 | 26.6K | 8.2K | Jan 1993 – Oct 2001 |
| Porter-Trask O-3-23910 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Burleson | 1 | 25.3K | 27.6K | May 2000 – Aug 2002 |
| Burns Ranch O-1-11644 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | Frio | 1 | 24.2K | 54.9K | Jan 1993 – Oct 2001 |
| Matcek-Mitchell Unit O-3-13925 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Burleson | 1 | 23.5K | 235K | Jan 1993 – Jul 2001 |
| Wintershall-Peters Unit O-3-21494 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Brazos | 1 | 22.2K | 218K | Jan 1993 – Apr 2006 |
| Gold, Mary O-3-15320 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Burleson | 2 | 21K | 262K | Jan 1993 – Jul 2001 |
| Howell, H. H. O-1-5319 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | Frio | 2 | 20.3K | 23.3K | Jan 1993 – Mar 2004 |
| Cotrone-Jewish Welfare Unit O-3-22744 | Williams, Clayton Energy, Inc. | Giddings (Buda) | Burleson | 1 | 17.9K | 5.9K | May 1995 – Mar 2008 |
| Strait O-1-12662 | Williams, Clayton Energy, Inc. | Pearsall (Austin Chalk) | La Salle | 2 | 17K | 21 | Jan 1993 – Apr 2002 |
| McCabe, J.F. -C- O-10-34300 | Williams, Clayton Energy, Inc. | Jameson N. (Odom) | Mitchell | 3 | 16.7K | 31.7K | Oct 1994 – Dec 2007 |
| Piwonka-Matcek Unit O-3-15142 | Williams, Clayton Energy, Inc. | Giddings (Austin Chalk-3) | Burleson | 1 | 16.2K | 146K | Jan 1993 – Jul 2001 |
| Milburn O-3-17825 | Williams, Clayton Energy, Inc. | Dime Box (Navarro) | Lee | 4 | 16.1K | 7.22K | Jan 1993 – May 2013 |