| Hearne, L. R. O-7-6020 | Northern Pacific Oil Incorporatd only | East Texas | Gregg | 21 | 1.43M | 553K | by Jan 1993 – Dec 2020 |
| State Pacific 55-T2-8 O-10-52582 | BPX Operating Company only | Phantom (Wolfcamp) | Loving | 3 | 1.19M | 3.98M | Jan 2019 – Aug 2026 |
| Yamaha Pacifica O-10-57615 | Oxyrock Operating, LLC only | Spraberry (Trend Area) | Howard | 5 | 995K | 2.84M | Jul 2022 – Aug 2026 |
| Yamaha Pacifica G O-10-58051 | Oxyrock Operating, LLC only | Spraberry (Trend Area) | Howard | 3 | 819K | 1.45M | Aug 2022 – Aug 2026 |
| Wood, Bob O-7-7883 | Northern Pacific Oil Incorporatd only | East Texas | Gregg | 12 | 799K | 215K | by Jan 1993 – Nov 2019 |
| Yamaha Pacifica F O-10-57655 | Oxyrock Operating, LLC only | Spraberry (Trend Area) | Howard | 4 | 761K | 1.99M | Aug 2022 – Aug 2026 |
| Yamaha Pacifica E O-10-57654 | Oxyrock Operating, LLC only | Spraberry (Trend Area) | Howard | 3 | 521K | 1.42M | Jul 2022 – Aug 2026 |
| Citori Unit O-3-23062 | Union Pacific Resources Company only | Giddings (Buda) | Milam | 1 | 283K | 126K | Jul 1996 – Mar 1999 |
| Schattel O-10-25837 | Northern Pacific Oil Incorporatd only | Iatan, East Howard | Mitchell | 9 | 189K | 21 | by Jan 1993 – Sep 2020 |
| Pacific 1 O-10-38223 | Atlantic Operating II, LLC only | Grice (Delaware) | Loving | 5 | 178K | 285K | Feb 2007 – Aug 2026 |
| Jawbreaker Unit O-3-22384 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Fayette | 1 | 151K | 610K | Apr 1994 – Sep 1994 |
| Pacifico O-10-54137 | Gordy Oil Company only | Wolfbone (Trend Area) | Pecos | 1 | 139K | 416K | Jul 2022 – Aug 2026 |
| Georgia-Pacific O-13-23867 | Sutherland Energy Co., LLC only | Quanah | Hardeman | 2 | 126K | 11.1K | by Jan 1993 – Jul 2022 |
| Schumacher -A- O-10-28910 | Northern Pacific Oil Incorporatd only | Iatan, East Howard | Mitchell | 4 | 120K | 21 | by Jan 1993 – Mar 2020 |
| Cartwright-Moore Unit O-3-23512 | Union Pacific Resources Company only | Giddings (Buda) | Milam | 1 | 115K | 50.4K | Jun 1997 – Dec 1998 |
| Tooke, A. O-7-8005 | Northern Pacific Oil Incorporatd only | East Texas | Gregg | 18 | 106K | 90.3K | by Jan 1993 – Feb 2021 |
| Schattel B O-10-23133 | Northern Pacific Oil Incorporatd only | Iatan, East Howard | Mitchell | 5 | 103K | 21 | by Jan 1993 – Sep 2020 |
| Schattel -A- O-10-27133 | Northern Pacific Oil Incorporatd only | Iatan, East Howard | Mitchell | 4 | 95K | 21 | by Jan 1993 – Sep 2020 |
| Maggie Unit O-3-23596 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Bastrop | 1 | 88.1K | 39.6K | Feb 1998 – Feb 1999 |
| Grant O-3-23533 | Union Pacific Resources Company only | Giddings (Buda) | Brazos | 1 | 77K | 90.7K | Sep 1997 – Sep 1998 |
| Dietz-OL Unit O-3-22105 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Washington | 1 | 74.2K | 600K | Jul 1993 – Oct 1993 |
| Teinert-Kunze Unit O-3-21604 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Fayette | 1 | 67.6K | 285K | by Jan 1993 – Feb 1998 |
| Tatsch O-1-13721 | Union Pacific Resources Company only | Pearsall (Austin Chalk) | Frio | 1 | 65.6K | 65.2K | Mar 1993 – Dec 1998 |
| Blacktail Unit O-3-23474 | Union Pacific Resources Company only | Giddings (Buda) | Robertson | 1 | 64.2K | 33.2K | Feb 1998 – Jul 1998 |
| Arco-Vastar Unit A-1008 O-6-12958 | Union Pacific Resources Company only | Brookeland (Austin Chalk, 8800) | Newton | 1 | 62K | 287K | by Jan 1993 – Sep 1995 |
| The Pines, Inc.-Karisch Unit O-3-21223 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Fayette | 1 | 57.9K | 412K | by Jan 1993 – Jan 1998 |
| Bukowski-Bienski Unit O-3-21384 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Brazos | 1 | 57.5K | 262K | by Jan 1993 – Jun 2000 |
| Dupriest, W. R. O-13-311 | Pacific Exploration Oper Co, LLC only | Archer County Regular | Archer | 8 | 57.3K | 77 | by Jan 1993 – Apr 2014 |
| Scott-Ruesink Unit O-3-21182 | Union Pacific Resources Company only | Kurten (Buda) | Brazos | 1 | 56.6K | 57.7K | by Jan 1993 – Aug 1997 |
| Hobbs Unit O-6-13489 | Union Pacific Resources Company only | Brookeland (Austin Chalk, 8800) | Newton | 1 | 53.5K | 366K | Nov 1995 – Jan 1997 |
| Oliver F. Goen Unit O-3-21675 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Brazos | 1 | 53.3K | 359K | by Jan 1993 – Jul 1998 |
| Wardner O-4-11428 | Union Pacific Resources Company only | Stratton (F-39-11) | Nueces | 4 | 51K | 255K | by Jan 1993 – Oct 1996 |
| Dees-OL Unit O-3-22265 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Lee | 1 | 48.8K | 57.3K | Jul 1993 – Oct 1998 |
| Burton-Wells Unit O-3-23513 | Union Pacific Resources Company only | Giddings (Buda) | Milam | 1 | 47.3K | 21.2K | Feb 1998 – Dec 1998 |
| Sadberry-Foyt Unit O-3-23508 | Union Pacific Resources Company only | Giddings (Buda) | Robertson | 1 | 43.5K | 24.2K | Feb 1998 – Dec 1998 |
| Horned Frog O-3-20900 | Union Pacific Resources Company only | Kurten (Buda) | Brazos | 2 | 43.5K | 95.9K | by Jan 1993 – Apr 1996 |
| Arco-Vastar Unit A-172A O-6-13211 | Union Pacific Resources Company only | Brookeland (Austin Chalk, 8800) | Newton | 1 | 43K | 218K | Aug 1993 – Feb 1995 |
| Woodyard-Cargill Unit O-3-22284 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Brazos | 1 | 43K | 104K | Oct 1993 – Dec 1995 |
| Jones-Jones Unit O-3-21524 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Brazos | 1 | 42.4K | 259K | by Jan 1993 – Feb 1998 |
| Arco Fee A-249 O-6-13377 | Union Pacific Resources Company only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 41.1K | 560K | Sep 1994 – Sep 1996 |
| Weedon-Weedon "B" Unit O-3-21918 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Brazos | 1 | 40.2K | 160K | by Jan 1993 – Dec 1996 |
| Arco-Vastar Unit A-172 O-6-13031 | Union Pacific Resources Company only | Brookeland (Austin Chalk, 8800) | Newton | 1 | 38.7K | 262K | by Jan 1993 – Jun 1997 |
| Samelson-Dunze Unit O-3-21687 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Fayette | 1 | 38K | 50.8K | by Jan 1993 – Jan 1998 |
| Temple Industries O-6-13088 | Union Pacific Resources Company only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 37.9K | 149K | by Jan 1993 – Apr 1995 |
| Sengelmann-Teinert O-3-21351 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Fayette | 1 | 37.2K | 74.5K | by Jan 1993 – Feb 1998 |
| Louisiana Pacific O-3-21091 | Alpine Resources, Inc. only | Cleveland (Yegua 5800) | Liberty | 1 | 36.2K | 46K | by Jan 1993 – May 2001 |
| Nietsche-Sylvester Unit O-3-21756 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Fayette | 1 | 35.7K | 69.4K | by Jan 1993 – Jan 1999 |
| Scifres, Raymond E. "C" O-8-15272 | Terrell Oil & Gas Production Co. only | Royston | Fisher | 5 | 33.1K | 490 | by Jan 1993 – Jan 2013 |
| Lenz Unit O-3-21475 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Brazos | 1 | 33.1K | 270K | by Jan 1993 – Aug 1999 |
| Gruene, O. A. O-4-10871 | Union Pacific Resources Company only | Stratton (G-15-5) | Nueces | 1 | 32.7K | 27.9K | by Jan 1993 – Oct 1996 |