| Citori Unit O-3-23062 | Union Pacific Resources Company | Giddings (Buda) | Milam | 1 | 283K | 126K | Jul 1996 – Mar 1999 |
| Jawbreaker Unit O-3-22384 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 151K | 610K | Apr 1994 – Sep 1994 |
| Cartwright-Moore Unit O-3-23512 | Union Pacific Resources Company | Giddings (Buda) | Milam | 1 | 115K | 50.4K | Jun 1997 – Dec 1998 |
| Maggie Unit O-3-23596 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Bastrop | 1 | 88.1K | 39.6K | Feb 1998 – Feb 1999 |
| Grant O-3-23533 | Union Pacific Resources Company | Giddings (Buda) | Brazos | 1 | 77K | 90.7K | Sep 1997 – Sep 1998 |
| Dietz-OL Unit O-3-22105 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Washington | 1 | 74.2K | 600K | Jul 1993 – Oct 1993 |
| Teinert-Kunze Unit O-3-21604 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 67.6K | 285K | Jan 1993 – Feb 1998 |
| Tatsch O-1-13721 | Union Pacific Resources Company | Pearsall (Austin Chalk) | Frio | 1 | 65.6K | 65.2K | Mar 1993 – Dec 1998 |
| Blacktail Unit O-3-23474 | Union Pacific Resources Company | Giddings (Buda) | Robertson | 1 | 64.2K | 33.2K | Feb 1998 – Jul 1998 |
| Arco-Vastar Unit A-1008 O-6-12958 | Union Pacific Resources Company | Brookeland (Austin Chalk, 8800) | Newton | 1 | 62K | 287K | Jan 1993 – Sep 1995 |
| The Pines, Inc.-Karisch Unit O-3-21223 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 57.9K | 412K | Jan 1993 – Jan 1998 |
| Bukowski-Bienski Unit O-3-21384 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 57.5K | 262K | Jan 1993 – Jun 2000 |
| Scott-Ruesink Unit O-3-21182 | Union Pacific Resources Company | Kurten (Buda) | Brazos | 1 | 56.6K | 57.7K | Jan 1993 – Aug 1997 |
| Hobbs Unit O-6-13489 | Union Pacific Resources Company | Brookeland (Austin Chalk, 8800) | Newton | 1 | 53.5K | 366K | Nov 1995 – Jan 1997 |
| Oliver F. Goen Unit O-3-21675 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 53.3K | 359K | Jan 1993 – Jul 1998 |
| Wardner O-4-11428 | Union Pacific Resources Company | Stratton (F-39-11) | Nueces | 4 | 51K | 255K | Jan 1993 – Oct 1996 |
| Dees-OL Unit O-3-22265 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Lee | 1 | 48.8K | 57.3K | Jul 1993 – Oct 1998 |
| Burton-Wells Unit O-3-23513 | Union Pacific Resources Company | Giddings (Buda) | Milam | 1 | 47.3K | 21.2K | Feb 1998 – Dec 1998 |
| Sadberry-Foyt Unit O-3-23508 | Union Pacific Resources Company | Giddings (Buda) | Robertson | 1 | 43.5K | 24.2K | Feb 1998 – Dec 1998 |
| Horned Frog O-3-20900 | Union Pacific Resources Company | Kurten (Buda) | Brazos | 2 | 43.5K | 95.9K | Jan 1993 – Apr 1996 |
| Arco-Vastar Unit A-172A O-6-13211 | Union Pacific Resources Company | Brookeland (Austin Chalk, 8800) | Newton | 1 | 43K | 218K | Aug 1993 – Feb 1995 |
| Woodyard-Cargill Unit O-3-22284 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 43K | 104K | Oct 1993 – Dec 1995 |
| Jones-Jones Unit O-3-21524 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 42.4K | 259K | Jan 1993 – Feb 1998 |
| Arco Fee A-249 O-6-13377 | Union Pacific Resources Company | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 41.1K | 560K | Sep 1994 – Sep 1996 |
| Weedon-Weedon "B" Unit O-3-21918 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 40.2K | 160K | Jan 1993 – Dec 1996 |
| Arco-Vastar Unit A-172 O-6-13031 | Union Pacific Resources Company | Brookeland (Austin Chalk, 8800) | Newton | 1 | 38.7K | 262K | Jan 1993 – Jun 1997 |
| Samelson-Dunze Unit O-3-21687 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 38K | 50.8K | Jan 1993 – Jan 1998 |
| Temple Industries O-6-13088 | Union Pacific Resources Company | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 37.9K | 149K | Jan 1993 – Apr 1995 |
| Sengelmann-Teinert O-3-21351 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 37.2K | 74.5K | Jan 1993 – Feb 1998 |
| Nietsche-Sylvester Unit O-3-21756 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 35.7K | 69.4K | Jan 1993 – Jan 1999 |
| Lenz Unit O-3-21475 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 33.1K | 270K | Jan 1993 – Aug 1999 |
| Gruene, O. A. O-4-10871 | Union Pacific Resources Company | Stratton (G-15-5) | Nueces | 1 | 32.7K | 27.9K | Jan 1993 – Oct 1996 |
| Zgabay, Edwin "C" O-3-15923 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Burleson | 1 | 30.8K | 251K | Jan 1993 – Aug 1998 |
| Bush-Bush Unit O-3-21684 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Burleson | 1 | 28.7K | 201K | Jan 1993 – Mar 2000 |
| Stetz-Rancho Grande Unit O-3-21986 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 28.3K | 187K | Mar 1993 – Nov 1999 |
| Cermorleb-Harbers Unit O-3-21670 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 28K | 205K | Jan 1993 – Apr 1994 |
| W.R.B. O-11-67383 | Union Pacific Resources Company | Pancho-Mag, SW. (Canyon Reef) | Borden | 1 | 25.8K | 5.64K | Mar 1995 – Dec 1996 |
| Texaco "C" O-6-12999 | Union Pacific Resources Company | Brookeland (Austin Chalk, 8800) | Newton | 2 | 25.2K | 316K | Jan 1993 – Mar 1995 |
| Zgabay, Delbert O-3-13119 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Burleson | 2 | 25.2K | 263K | Jan 1993 – Feb 1996 |
| Carroll-Beiring Unit O-3-21156 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 24.5K | 114K | Jan 1993 – Sep 1996 |
| Salpetro-Penicka Unit O-3-22421 | Union Pacific Resources Company | Giddings (Buda) | Brazos | 1 | 24.4K | 37.8K | May 1994 – Apr 1996 |
| Mills-McGee Trust Unit O-3-23514 | Union Pacific Resources Company | Giddings (Buda) | Milam | 1 | 24.3K | 48.3K | Mar 1998 – Dec 1998 |
| Knox, J. et Al O-3-11828 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Lee | 1 | 24.2K | 280K | Jan 1993 – Oct 1996 |
| Luedecke-Davros Unit O-3-22451 | Union Pacific Resources Company | Giddings (Buda) | Brazos | 1 | 23.9K | 62.4K | Jan 1994 – Oct 1994 |
| Moss, Edward O-3-21800 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 23.7K | 49.5K | Jan 1993 – Mar 1999 |
| Bush-Stetz Unit O-3-21694 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 23.7K | 206K | Jan 1993 – Feb 2000 |
| Risinger-Cooke Unit O-3-21796 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 23.6K | 31.6K | Jan 1993 – Sep 1994 |
| Callis-Miller Lagrange Unit O-3-21474 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 22.8K | 37.7K | Jan 1993 – Dec 1996 |
| Rost Unit O-3-20553 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Lee | 1 | 22.8K | 535K | Jan 1993 – Oct 1999 |
| Schkade-Paseur Unit O-3-21308 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 22.4K | 83.2K | Jan 1993 – Mar 1997 |