| Flewellen, J. J. -B- O-7-8371 | Basa Resources, Inc. only | East Texas | Gregg | 12 | 300K | 14.1K | Jan 1993 – Apr 2026 |
| Flewellen-Russ O-7-8372 | Basa Resources, Inc. only | East Texas | Gregg | 2 | 61.4K | 38 | Jan 1993 – Apr 2026 |
| Flewellen, J. J. O-7-7261 | R2Q Operating LLC only | East Texas | Gregg | 2 | 44.2K | 178 | Jan 1993 – Feb 2026 |
| Flewellen, E. H. O-3-9709 | Titan Rock E&P, LLC only | Cotton Lake | Chambers | 1 | 33.9K | 152 | Jan 1993 – Sep 2020 |
| Flewellen-Clemens (Alloc) G-6-282545 | Dallas Production Company LLC only | Willow Springs (Cotton Valley) | Gregg | 1 | 26.2K | 3.6M | Mar 2017 – Apr 2026 |
| Flewellen G-6-98005 | Neches Exploration, L.L.C. only | Willow Springs-Mackey (Tr. Pk.) | Gregg | 1 | 22.8K | 1.72M | Jul 1993 – Apr 2026 |
| Flewellen O-7-6041 | Miken Oil, Inc. only | East Texas | Gregg | 1 | 21.3K | 35 | Jan 1993 – May 2018 |
| Flewellen, J. J. Estate G-6-168531 | Dallas Production Company LLC only | Glenwood (Cotton Valley) | Gregg | 1 | 15.7K | 1.04M | Apr 1998 – Dec 2010 |
| Flewellen, J. J. Estate G-6-147929 | Dallas Production Company LLC only | Glenwood (Cotton Valley) | Upshur | 1 | 14.7K | 887K | Jan 1994 – Dec 2010 |
| Flewellen, J. J. Estate G-6-144487 | Dallas Production Company LLC only | Glenwood (Cotton Valley) | Gregg | 1 | 12.3K | 1.05M | Feb 1993 – Sep 2021 |
| Flewellen G-6-16856 | Cook Exploration Co. only | Willow Springs (Henderson) | Gregg | 1 | 11.6K | 828K | Feb 1993 – Apr 2026 |
| Flewellen, J. J. Estate G-6-154502 | Dallas Production Company LLC only | Glenwood (Cotton Valley) | Upshur | 1 | 11.3K | 724K | May 1995 – May 2011 |
| Flewellen GU 1 G-6-224794 | Sydri Operating, LLC only | Willow Springs (Cotton Valley) | Gregg | 1 | 11.2K | 2.06M | Jul 2006 – Apr 2026 |
| Flewellen, J. J. Estate G-6-161866 | Dallas Production Company LLC only | Glenwood (Cotton Valley) | Gregg | 1 | 10.9K | 911K | Jan 1997 – Feb 2011 |
| Flewellen J J Gas Unit G-6-152721 | Diversified Production LLC only | White Oak (Cotton Valley Sand) | Upshur | 1 | 10.8K | 1.02M | Apr 1995 – Oct 2023 |
| Flewellen G-6-294209 | Neches Exploration, L.L.C. only | Willow Springs (Travis Peak) | Gregg | 1 | 9.83K | 357K | Feb 2023 – Apr 2026 |
| Flewellen G-6-220850 | Sydri Operating, LLC only | Willow Springs (Cotton Valley) | Gregg | 1 | 9.69K | 643K | Apr 2006 – Apr 2026 |
| Flewellen GU 1 G-6-222594 | Sydri Operating, LLC only | Willow Springs (Cotton Valley) | Gregg | 1 | 9.55K | 907K | Jul 2006 – Apr 2026 |
| Flewellen GU 1 G-6-222598 | Sydri Operating, LLC only | Willow Springs (Cotton Valley) | Gregg | 1 | 7.19K | 1.38M | Jul 2006 – Apr 2026 |
| Flewellen G-6-145525 | Neches Exploration, L.L.C. only | Willow Springs (Cotton Valley) | Gregg | 1 | 7.03K | 1.2M | Apr 1993 – Jan 2023 |
| Flewellen G-6-90394 | Neches Exploration, L.L.C. only | Willow Springs-Mackey (Tr. Pk.) | Gregg | 1 | 6.98K | 764K | Jan 1993 – Apr 2023 |
| Flewellen G-6-220847 | Sydri Operating, LLC only | Willow Springs (Cotton Valley) | Gregg | 1 | 6.14K | 561K | Apr 2006 – Dec 2025 |
| Flewellen GU 1 G-6-225254 | Sydri Operating, LLC only | Willow Springs (Cotton Valley) | Gregg | 1 | 6.06K | 200K | Apr 2006 – Mar 2007 |
| Flewellen, J. J. Estate G-6-224865 | Dallas Production Company LLC only | Glenwood (Cotton Valley) | Gregg | 1 | 5.92K | 515K | Dec 2006 – Sep 2021 |
| Flewellen, J. J. Estate G-6-175212 | Dallas Production Company LLC only | Glenwood (Cotton Valley) | Upshur | 1 | 5.69K | 501K | Oct 1999 – Feb 2011 |
| Flewellen G-6-167233 | Neches Exploration, L.L.C. only | Willow Springs (Cotton Valley) | Gregg | 1 | 5.48K | 1.13M | Jan 1998 – Aug 2017 |
| Flewellen G-6-172550 | Neches Exploration, L.L.C. only | Willow Springs (Cotton Valley) | Gregg | 1 | 5.14K | 785K | Dec 1998 – Feb 2017 |
| Flewellen G U #1 G-6-177704 | Sydri Operating, LLC only | Danville (TP-CV Cons.) | Gregg | 1 | 4.48K | 260K | May 2000 – Nov 2023 |
| Flewellen G-6-171658 | Neches Exploration, L.L.C. only | Willow Springs (Cotton Valley) | Gregg | 1 | 4.12K | 1.01M | Nov 1998 – May 2015 |
| Flewellen GU 1 G-6-226315 | Sydri Operating, LLC only | Danville (TP-CV Cons.) | Gregg | 1 | 3.98K | 1.63M | Dec 2006 – Mar 2026 |
| Flewellen GU 1 G-6-226313 | Sydri Operating, LLC only | Danville (TP-CV Cons.) | Gregg | 1 | 3.89K | 1.34M | Dec 2006 – Apr 2026 |
| Flewellen, J. J. G-6-171368 | Diversified Production LLC only | Glenwood (Cotton Valley) | Gregg | 1 | 3.32K | 1.04M | Nov 1998 – Apr 2026 |
| Flewellen, J. J. Estate G-6-193450 | Dallas Production Company LLC only | Glenwood (Cotton Valley) | Upshur | 1 | 3.31K | 335K | Feb 2003 – Feb 2011 |
| Flewellen Gas Unit G-6-176975 | Cook Exploration Co. only | Willow Springs (Travis Peak) | Gregg | 1 | 3.24K | 301K | Feb 2000 – Mar 2009 |
| Flewellen G-6-283329 | Neches Exploration, L.L.C. only | Willow Springs-Mackey (Tr. Pk.) | Gregg | 1 | 2.73K | 396K | Jun 2017 – Apr 2026 |
| Flewellen, J. J. G-6-176670 | Diversified Production LLC only | Glenwood (Cotton Valley) | Gregg | 1 | 1.78K | 957K | Jan 2000 – Apr 2026 |
| Flewellen G-6-164586 | Cook Exploration Co. only | Willow Springs (Cotton Valley) | Gregg | 1 | 1.78K | 80.1K | Jun 1997 – Jan 2000 |
| Flewellen G U #1 O-6-14746 | Hilcorp Energy Company only | Danville (TP-CV Cons.) | Gregg | 1 | 1.73K | 197K | Feb 2008 – Jan 2015 |
| Flewellen G U #1 O-6-14668 | Burlington Resources O & G Co LP only | Danville (Travis Peak Cons.) | Gregg | 1 | 1.68K | 36K | May 2007 – Jan 2008 |
| Flewellen, J. J. G-6-170050 | Miken Oil, Inc. only | Glenwood (Cotton Valley) | Gregg | 1 | 1.38K | 1.15M | Jul 1998 – Feb 2019 |
| Flewellen G-6-284681 | Neches Exploration, L.L.C. only | Willow Springs (Travis Peak) | Gregg | 1 | 1.26K | 161K | Jun 2018 – Apr 2026 |
| Flewellen G U #1 G-6-276568 | Sydri Operating, LLC only | Danville (TP-CV Cons.) | Gregg | 1 | 800 | 114K | Feb 2015 – Jan 2026 |
| Flewellen G-6-89803 | Sydri Operating, LLC only | Willow Springs (Travis Peak) | Gregg | 1 | 501 | 93K | Jan 1993 – Apr 2000 |
| Flewellen, J. J. G-6-180909 | Miken Oil, Inc. only | Glenwood (Cotton Valley) | Upshur | 1 | 432 | 720K | Oct 2000 – May 2019 |
| Flewellen, J. J. G-6-172013 | Diversified Production LLC only | Glenwood (Cotton Valley) | Upshur | 1 | 30 | 307K | Jan 1999 – Sep 2014 |
| Flewellen G U #1 G-6-220853 | Sydri Operating, LLC only | Danville (TP-CV Cons.) | Gregg | 1 | 0 | 0 | — |
| Flewellen G-6-293273 | Neches Exploration, L.L.C. only | Willow Springs (Travis Peak) | Gregg | 1 | 0 | 44.2K | Aug 2022 – Apr 2026 |
| Flewellen G U #1 G-6-220848 | Sydri Operating, LLC only | Danville (TP-CV Cons.) | Gregg | 1 | 0 | 0 | — |
| Flewellen G-6-133903 | Sydri Operating, LLC only | Willow Springs (Rodessa) | Gregg | 1 | 0 | 0 | — |
| Flewellen G-6-89802 | Sydri Operating, LLC only | Willow Springs (Cotton Valley) | Gregg | 1 | 0 | 0 | — |