| Old Ocean Unit G-3-214089 | Hilcorp Energy Company only | Old Ocean (Campbell) | Brazoria | 1 | 27K | 2.41M | Jan 2006 – Aug 2015 |
| Holy Comforter Unit G-3-131533 | Wing Corporation only | Angleton, S. (F-4 FB-AZ) | Brazoria | 1 | 26.9K | 2.34M | by Jan 1993 – Apr 1999 |
| Crazy Chester G-3-286514 | Llox, L.L.C. only | Chocolate Bayou | Brazoria | 1 | 26.6K | 1.14M | May 2019 – Dec 2020 |
| Old Ocean Unit G-3-7584 | Hilcorp Energy Company only | Old Ocean (Armstrong) | Brazoria | 1 | 26.5K | 3.57M | by Jan 1993 – Nov 2002 |
| Alford G-3-207121 | Noble Energy Inc only | Blue Lake (10500) | Brazoria | 1 | 26.2K | 1.03M | Dec 2004 – Feb 2007 |
| Old Ocean Unit G-3-126737 | Hilcorp Energy Company only | Old Ocean (Armstrong) | Brazoria | 1 | 26.1K | 1.85M | by Jan 1993 – Apr 2026 |
| Old Ocean Unit G-3-256637 | Hilcorp Energy Company only | Old Ocean (F-26) | Brazoria | 1 | 26.1K | 1.02M | Feb 2010 – Jan 2018 |
| Sebesta Gas Unit O-3-23799 | Brigham Oil & Gas, L.P. only | Danbury Dome, West (Frio 10,500) | Brazoria | 1 | 26K | 222K | Feb 2000 – Feb 2002 |
| Old Ocean Unit G-3-249844 | Hilcorp Energy Company only | Old Ocean (F-26) | Brazoria | 1 | 25.9K | 1.09M | May 2009 – Apr 2026 |
| McFarland, Robert et Al O-3-20720 | Merit Energy Company only | Pledger (Frio 7430) | Brazoria | 1 | 25.7K | 47.8K | by Jan 1993 – Aug 1997 |
| Hannah-Clare G-3-227591 | Aspect Energy, LLC only | Iowa Colony (9700 Vicksburg) | Brazoria | 1 | 25.5K | 810K | Jan 2007 – May 2009 |
| Davis, Elsie F. Trustee O-3-20985 | Gcows Operating LLC only | Manvel (Miocene -B-, Upper) | Brazoria | 1 | 25.4K | 9.14K | by Jan 1993 – Feb 2004 |
| Old Ocean Unit G-3-136880 | Hilcorp Energy Company only | Old Ocean (Armstrong) | Brazoria | 1 | 25.1K | 4.42M | by Jan 1993 – Apr 2026 |
| Munson Unit G-3-187135 | Timberwolf Energy, Inc. only | Collins Lake (Hackberry 11,500) | Brazoria | 1 | 25.1K | 926K | Jun 2001 – Nov 2004 |
| Old Ocean Unit G-3-271184 | Hilcorp Energy Company only | Old Ocean (Larsen) | Brazoria | 1 | 25K | 718K | Jul 2013 – May 2017 |
| O'Leary Unit G-3-241736 | Davis Gulf Coast, Inc. only | Four Corners (Frio F-23) | Brazoria | 1 | 24.9K | 104K | May 2005 – May 2006 |
| Old Ocean Unit G-3-47028 | Hilcorp Energy Company only | Old Ocean (Larsen) | Brazoria | 1 | 24.5K | 410K | Jun 1995 – Dec 1999 |
| Vieman G-3-159882 | EOG Resources, Inc. only | Manor Lake (10000) | Brazoria | 1 | 24.3K | 4.17M | Jul 1996 – Jun 1999 |
| Gayle O-3-25089 | Dewbre Petroleum Corporation only | Baileys Prairie (Frio -J- Sand) | Brazoria | 1 | 24K | 103K | Sep 2007 – Feb 2012 |
| Williamson-Retrieve Unit No. 1 G-3-130811 | Wing Corporation only | Angleton, S. (F-4 FB-AZ) | Brazoria | 1 | 23.8K | 2.02M | by Jan 1993 – Feb 1999 |
| Harrison Partners O-3-25732 | Slawson Exploration Company, Inc only | Angleton, South (12,600) | Brazoria | 1 | 23.2K | 196K | May 2011 – Jun 2014 |
| Bullard/Strouhal O-3-22286 | Howard Exploration, Inc. only | Chocolate Bayou ( Frio Upper) | Brazoria | 1 | 23K | 83.5K | Aug 1993 – Mar 2002 |
| South Texas Grain Co. O-3-5604 | Exxon Corp. only | Hastings, East | Brazoria | 4 | 22.8K | 117K | by Jan 1993 – Jun 1997 |
| Pure, et al GU G-3-208113 | Proline Energy Resources Inc only | Martin Ranch (Frio 14,600) | Brazoria | 1 | 22.6K | 5.04M | Jan 2005 – Aug 2024 |
| Farms, I. P. -A- O-3-26180 | Proline Energy Resources Inc only | Chocolate Bayou (Lower Schenk) | Brazoria | 1 | 22.6K | 135K | May 2013 – Aug 2015 |
| Blackstone-Hlavinka O-3-27927 | Elliott Oil & Gas Operating Co. only | Pegasus Gulf Coast (Grubbs) | Brazoria | 1 | 22.5K | 219K | Apr 2022 – Feb 2024 |
| Huffman, V. S. O-3-23937 | Elliott Oil & Gas Operating Co. only | Arcola (7320) | Brazoria | 1 | 22.5K | 62.6K | Sep 2000 – Sep 2021 |
| Burton & Baynes O-3-13287 | Beck Resources Incorporated only | Manvel (Miocene 3300) | Brazoria | 1 | 22.4K | 21 | by Jan 1993 – Oct 2015 |
| Old Ocean Unit G-3-249557 | Hilcorp Energy Company only | Old Ocean (Larsen) | Brazoria | 1 | 22.1K | 1.11M | Mar 2009 – Apr 2026 |
| Houston "A" G-3-176832 | Elliott Oil & Gas Operating Co. only | Chocolate Bayou ( Frio P) | Brazoria | 1 | 22K | 1.66M | Mar 2000 – Jun 2010 |
| Zinn Gas Unit G-3-169361 | Transtexas Gas Corporation only | Danbury, South (Frio 12,300) | Brazoria | 1 | 22K | 968K | May 1998 – Jun 1999 |
| Black Stone Ivory G-3-211194 | Elliott Oil & Gas Operating Co. only | Chocolate Bayou, S. (Schenck) | Brazoria | 1 | 21.6K | 1.44M | Aug 2005 – Jul 2021 |
| Williamson G-3-94897 | Wing Corporation only | Angleton, S. (Frio 13 FB-B) | Brazoria | 1 | 21.6K | 934K | by Jan 1993 – Nov 1999 |
| Cozby G-3-120855 | Phillips Petroleum Company only | Chocolate Bayou (12,000) | Brazoria | 1 | 21.4K | 491K | by Jan 1993 – Sep 1997 |
| Old Ocean Unit G-3-133862 | Hilcorp Energy Company only | Old Ocean (Campbell) | Brazoria | 1 | 21.1K | 2.07M | by Jan 1993 – Jul 2003 |
| Davis, E. F., Tr. O-3-7850 | North Central Oil Corp. only | Manvel (Miocene) | Brazoria | 3 | 21K | 42.7K | by Jan 1993 – Oct 1998 |
| Farms, I.P. G-3-149427 | Peregrine Energy, Inc. only | Chocolate Bayou (Anamolina) | Brazoria | 1 | 20.9K | 1.66M | Apr 1994 – Mar 1997 |
| Miller G-3-282091 | XOG Resources, LLC only | Chocolate Bayou ( Ho.fms. UP) | Brazoria | 1 | 20.8K | 422K | Oct 2016 – Aug 2022 |
| Smu G-3-189978 | Noble Energy Inc only | Algoa, South (Tex 2 Sand) | Brazoria | 1 | 20.6K | 629K | Jun 2002 – Aug 2003 |
| Halls Bayou G-3-281837 | Kaler Energy Corp. only | Pegasus Gulf Coast (Grubbs) | Brazoria | 1 | 20.4K | 80.2K | Nov 2016 – Dec 2016 |
| Old Ocean Unit G-3-136851 | Hilcorp Energy Company only | Old Ocean (Armstrong) | Brazoria | 1 | 20.4K | 1.47M | by Jan 1993 – Apr 2003 |
| Old Ocean Unit G-3-42739 | Hilcorp Energy Company only | Old Ocean (Larsen) | Brazoria | 1 | 20.4K | 2.19M | by Jan 1993 – Jan 2000 |
| Old Ocean Unit G-3-212103 | Hilcorp Energy Company only | Old Ocean (Chenault) | Brazoria | 1 | 20.1K | 1.75M | Sep 2003 – Sep 2008 |
| Old Ocean Unit G-3-262566 | Hilcorp Energy Company only | Old Ocean (F-26) | Brazoria | 1 | 20.1K | 595K | Apr 2011 – Apr 2026 |
| Old Ocean Unit G-3-219875 | Hilcorp Energy Company only | Old Ocean (Larsen) | Brazoria | 1 | 20.1K | 1.04M | Mar 2006 – Feb 2017 |
| Ewing, O. F. O-3-2928 | North Central Oil Corp. only | Manvel (Miocene) | Brazoria | 7 | 20.1K | 3.87K | by Jan 1993 – Apr 1998 |
| Old Ocean Unit G-3-211094 | Hilcorp Energy Company only | Old Ocean (F-10) | Brazoria | 1 | 20K | 1.29M | Jul 2005 – Apr 2026 |
| Wieting, A. M. O-3-27140 | White Marlin Operating Co, LLC only | Chocolate Bayou (Grubbs Sand) | Brazoria | 1 | 19.9K | 36.8K | Sep 2016 – Apr 2026 |
| Rice O-3-26422 | Fort Apache Energy, Inc. only | Danbury Dome | Brazoria | 1 | 19.9K | 11.7K | Oct 2013 – Sep 2014 |
| Old Ocean Unit G-3-213379 | Hilcorp Energy Company only | Old Ocean (F-10) | Brazoria | 1 | 19.8K | 600K | Oct 2005 – Apr 2026 |