| Welder Heirs CJ O-2-11431 | Charro Operating, L.L.C. only | Gaffney, SW. (5400) | Goliad | 5 | 139K | 215K | Nov 2017 – Aug 2026 |
| Welder Heirs G-4-142436 | Hurd Enterprises, Ltd. only | Bold Forbes (9550) | Duval | 1 | 117K | 5.21M | by Jan 1993 – Oct 2000 |
| Welder Heirs O-2-8529 | C & E Operating, Inc. only | Devils Run (Chamberlain 3A) | Refugio | 1 | 46.5K | 76K | Mar 2000 – Aug 2005 |
| Welder Heirs G-4-144943 | Hurd Enterprises, Ltd. only | Bold Forbes (9800) | Duval | 1 | 41.9K | 580K | Feb 1993 – Jul 2001 |
| Welder Heirs -A- O-4-5001 | Chandler Oil & Gas, LLC only | Seven Sisters | Duval | 4 | 37.6K | 144 | by Jan 1993 – Feb 2025 |
| Welder Heirs 212 G-4-149648 | Continental Exploration, L.L.C. only | Dejay, North (Slick) | Duval | 1 | 34.1K | 1.39M | Feb 1994 – Feb 2012 |
| Welder Heirs G-2-174735 | Dominion Expl. & Prod., Inc. only | Rob Welder (Wilcox 9100) | Victoria | 1 | 30.4K | 1.05M | Aug 1999 – Aug 2003 |
| Welder Heirs G-4-191515 | Suemaur Expl. & Prod., LLC only | Odem (7500) | San Patricio | 1 | 19.9K | 3.19M | Oct 2002 – Dec 2011 |
| Welder Heirs G-2-232689 | Kebo Oil & Gas, Inc. only | Lake Pasture (FT-690) | Refugio | 1 | 17.5K | 754K | Sep 2007 – Jul 2013 |
| Welder Heirs, J.F. G-4-228965 | Iron Jaw Operating LLC only | Odem (6700 Stringer) | San Patricio | 1 | 14.5K | 1.11M | May 2007 – Jul 2025 |
| Welder Heirs O-4-4933 | Chandler Oil & Gas, LLC only | Seven Sisters | Duval | 2 | 13.2K | 110 | Feb 1995 – Feb 2024 |
| Welder Heirs G-2-170630 | C & E Operating, Inc. only | Peponi Ranch (Frio 4800) | Refugio | 1 | 13.1K | 3.34M | Sep 1998 – Jun 2011 |
| Welder Heirs, J. F. O-4-13445 | Iron Jaw Operating LLC only | Odem (7300) | San Patricio | 1 | 8.65K | 27.8K | Feb 2007 – Jul 2025 |
| Welder Heirs G-4-108195 | Texas Southern Petroleum Corp. only | Seven Sisters, W. (5700) | Duval | 1 | 6.28K | 99K | by Jan 1993 – Oct 1999 |
| Welder Heirs -B- O-4-5190 | L.T.D. Explorations Inc. only | Seven Sisters (Frio -C-) | Duval | 1 | 5.69K | 144 | by Jan 1993 – Apr 2011 |
| Welder Heirs 211 G-4-150677 | Dreyfus, Louis Natural Gas Corp only | Dejay, North (Slick) | Duval | 1 | 5.51K | 236K | Aug 1994 – Oct 1997 |
| J F Welder Heirs G-4-215057 | Iron Jaw Operating LLC only | Odem (7500) | San Patricio | 1 | 4.12K | 495K | Oct 2005 – Mar 2025 |
| Welder Heirs TC G-2-284331 | Charro Operating, L.L.C. only | Greta, North (6440) | Refugio | 1 | 4.11K | 226K | Dec 2017 – Apr 2019 |
| Welder Heirs 1-381 O-4-9912 | McGowan Working Partners, Inc. only | Seven Sisters, W. (5700) | Duval | 1 | 3.76K | 159K | by Jan 1993 – Oct 2010 |
| Welder Heirs G-4-145264 | Sonat Exploration Co. - Houston only | Seven Sisters, East ( 9500) | Duval | 1 | 3.72K | 519K | May 1993 – Sep 1996 |
| Welder Heirs G-2-180674 | C & E Operating, Inc. only | Devils Run (5970 Frio) | Refugio | 1 | 3.06K | 447K | Jul 2000 – Nov 2003 |
| Welder Heirs 102 G-4-149912 | Suemaur Exploration, Inc. only | Dejay Deep (Luling, Lower) | Duval | 1 | 3.02K | 87K | Mar 1994 – Dec 1994 |
| Welder Heirs G-4-146102 | Hurd Enterprises, Ltd. only | Bold Forbes (9700) | Duval | 1 | 2.96K | 81.4K | Aug 1993 – Dec 1994 |
| Welder Heirs 102 G-4-149692 | Suemaur Exploration, Inc. only | Dejay Deep (Luling) | Duval | 1 | 2.9K | 62K | Apr 1994 – Jan 1995 |
| Welder Heirs O-2-8554 | C & E Operating, Inc. only | Devils Run (5050) | Refugio | 1 | 2.74K | 102 | Aug 2000 – Jan 2005 |
| Welder Heirs 211 G-4-102716 | Continental Exploration, L.L.C. only | Dejay, North (First Queen City) | Duval | 1 | 2.53K | 538K | by Jan 1993 – Feb 2012 |
| Welder Heirs -D- O-4-9034 | Texas Southern Petroleum Corp. only | Seven Sisters, W. (5700) | Duval | 3 | 2.42K | 94 | by Jan 1993 – Nov 2000 |
| Welder Heirs G-2-215180 | C & E Operating, Inc. only | Devils Run (Chamberlain 3A) | Refugio | 1 | 1.73K | 69.3K | Mar 2004 – Apr 2007 |
| Welder Heirs O-4-13921 | Sanchez Oil & Gas Corporation only | Seven Sisters | Duval | 2 | 1.68K | 0 | Feb 2015 – Jul 2016 |
| Welder Heirs G-4-262423 | Welderxp Ltd. only | Plymouth (6500) | San Patricio | 1 | 1.65K | 251K | May 2011 – Jan 2019 |
| Welder Heirs B-3 G-4-84913 | Riddle Engineering Corp. only | Loma Novia, NE. (Wilcox) | Duval | 1 | 1.13K | 168K | by Jan 1993 – Jul 2002 |
| Welder Heirs G-2-180311 | C & E Operating, Inc. only | Devils Run (6200) | Refugio | 1 | 1.12K | 141K | Sep 2000 – Sep 2003 |
| Welder Heirs G-2-157851 | Verus Energy, Inc only | Helen Gohlke, W. (Yegua) | Victoria | 1 | 1.03K | 278K | Mar 1996 – Nov 2000 |
| Welder Heirs B O-2-8619 | C & E Operating, Inc. only | Devils Run (Chamberlain 3A) | Refugio | 1 | 633 | 0 | Apr 2001 – Mar 2002 |
| Welder Heirs SW Odem G-4-221790 | EOG Resources, Inc. only | Odem (7500) | San Patricio | 1 | 464 | 10.2K | Aug 2006 – Oct 2006 |
| Welder Heirs G-4-184444 | Hurd Enterprises, Ltd. only | Strake Deep (Carrizo -R-) | Duval | 1 | 456 | 8.97K | Apr 2001 – Aug 2001 |
| Welder Heirs G-4-142647 | Hurd Enterprises, Ltd. only | Strake Deep (Carrizo -R-) | Duval | 1 | 365 | 3.79K | by Jan 1993 – Feb 1993 |
| Welder Heirs G-4-208121 | South Texas Operating Company only | Seven Sisters, S. (Wilcox, Lo.) | Duval | 1 | 165 | 2.84M | Aug 2004 – May 2019 |
| Welder Heirs 71 G-4-228137 | Remora Operating, LLC only | Seven Sisters, S. (Wilcox, Lo.) | Duval | 1 | 114 | 643K | May 2007 – Feb 2024 |
| Welder Heirs Unit G-2-182105 | C & E Operating, Inc. only | Devils Run (6200) | Refugio | 1 | 109 | 176K | Feb 2001 – Jun 2002 |
| Welder Heirs 215 G-4-200016 | Remora Operating, LLC only | Seven Sisters, S. (Wilcox, Lo.) | Duval | 1 | 65 | 1.27M | Feb 2004 – Feb 2024 |
| Welder Heirs G-4-140991 | Alegre Energy, Inc. only | Seven Sisters, East (1900) | Duval | 1 | 42 | 115K | by Jan 1993 – Sep 2003 |
| Welder Heirs G-4-163297 | Coastal Oil & Gas Corporation only | DST (Miocene 2150) | San Patricio | 1 | 39 | 43.7K | Aug 1997 – Apr 1999 |
| Welder Heirs, J. F. G-4-226778 | Southern Bay Operating, L.L.C. only | Odem (5100) | San Patricio | 1 | 33 | 5.78K | Feb 2007 – May 2007 |
| Welder Heirs G-4-160748 | Coastal Oil & Gas Corporation only | Oneil (3270) | San Patricio | 1 | 21 | 23K | Nov 1996 – Jun 1997 |
| Welder Heirs SW Odem G-4-223498 | EOG Resources, Inc. only | Odem (7200 Frio) | San Patricio | 1 | 7 | 3.87K | Nov 2006 – Dec 2006 |
| Welder Heirs 71 G-4-241983 | Simray GP, LLC only | Seven Sisters, S. (Wilcox, Lo.) | Duval | 1 | 1 | 107K | Jul 2008 – Sep 2012 |
| Welder Heirs 71 G-4-242068 | Remora Operating, LLC only | Seven Sisters, S. (Wilcox, Lo.) | Duval | 1 | 1 | 529K | Aug 2008 – Feb 2024 |
| Welder Heirs G-4-111474 | McGowan Working Partners, Inc. only | Seven Sisters (2300) | Duval | 1 | 0 | 10.3K | Oct 2001 – Feb 2012 |
| Welder Heirs G-4-83999 | New World Energy only | Dejay (Wilcox 8175) | Duval | 1 | 0 | 0 | — |