| Parker, J. E. -B- O-10-252 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 7 | 251K | 369K | Sep 1993 – Sep 1995 |
| Biles, J. D. O-10-7038 | Unitex Oil & Gas, L.L.C. only | Union | Andrews | 9 | 231K | 332K | by Jan 1993 – Aug 2026 |
| Parker, J. E. -C- (Amoco) O-10-266 | Union Oil Company of California only | Andrews (Wolfcamp) | Andrews | 6 | 207K | 299K | by Jan 1993 – Sep 1995 |
| Parker, J. E., -C- O-10-14698 | Union Oil Company of California only | Andrews, North (Strawn) | Andrews | 3 | 164K | 308K | by Jan 1993 – Nov 1997 |
| Parker, J. E. -B- O-10-34689 | Union Oil Company of California only | Andrews (Wolfcamp-Penn.) | Andrews | 7 | 163K | 374K | Oct 1995 – Nov 1997 |
| Parker, J. E. -C- (Amoco) O-10-34685 | Union Oil Company of California only | Andrews (Wolfcamp-Penn.) | Andrews | 7 | 154K | 362K | Oct 1995 – Nov 1997 |
| Parker, J. E. -G- O-10-247 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 3 | 112K | 107K | by Jan 1993 – Sep 1995 |
| Parker, J.E. "V" O-10-34086 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 4 | 87.7K | 135K | Jan 1994 – Sep 1995 |
| Parker, J.E. "C" O-10-34111 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 2 | 85.2K | 96.9K | Feb 1994 – Sep 1995 |
| Parker, J. E. -A- O-10-31375 | Union Oil Company of California only | Parker (Pennsylvanian) | Andrews | 2 | 66.5K | 52K | by Jan 1993 – Aug 1994 |
| Bourg O-10-25156 | Tacor Resources Inc only | Union | Andrews | 3 | 65.5K | 99.8K | by Jan 1993 – Dec 2016 |
| Scarborough Unit O-10-34749 | Texland Petroleum, L.P. only | Union | Andrews | 2 | 64.6K | 132K | Oct 1995 – Aug 2026 |
| Biles, J. D. O-10-11129 | Reliance Energy, Inc. only | Union | Andrews | 3 | 63.2K | 172K | by Jan 1993 – May 2026 |
| Parker, J. E. -C- O-10-34699 | Union Oil Company of California only | Andrews (Wolfcamp-Penn.) | Andrews | 2 | 62.6K | 80K | Oct 1995 – Nov 1997 |
| J. E. Parker "D" Unit O-10-34067 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 1 | 62.4K | 50.5K | Jan 1994 – Sep 1995 |
| Parker, J. E. "E" Unit O-10-33742 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 1 | 60.2K | 42.8K | Mar 1993 – Sep 1995 |
| Parker, J. E. -V- O-10-34698 | Union Oil Company of California only | Andrews (Wolfcamp-Penn.) | Andrews | 4 | 59.1K | 134K | Oct 1995 – Nov 1997 |
| Logswhite O-10-13895 | J. D. Gas, Inc. only | Union | Andrews | 4 | 58.6K | 110K | by Jan 1993 – Aug 2026 |
| Parker, J. E. "Z" O-10-34274 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 2 | 56.5K | 43.3K | Sep 1994 – Sep 1995 |
| Lineberry -D- O-10-14034 | Escondido Bay Corporation only | Union | Andrews | 3 | 55.2K | 270 | by Jan 1993 – Aug 2026 |
| Parker, J. E. -G- O-10-34687 | Union Oil Company of California only | Andrews (Wolfcamp-Penn.) | Andrews | 2 | 53.6K | 63.5K | Oct 1995 – Nov 1997 |
| Parker, J. E. -P- O-10-31582 | Union Oil Company of California only | Parker (Pennsylvanian) | Andrews | 2 | 52.3K | 53.5K | by Jan 1993 – Aug 1994 |
| Logsdon, C. W. -A- O-10-13651 | Unitex Oil & Gas, L.L.C. only | Union | Andrews | 2 | 52.1K | 264K | by Jan 1993 – Aug 2026 |
| Logsdon, C. W. O-10-13039 | Lime Rock Resources II-a, L.P. only | Union | Andrews | 3 | 51.5K | 144K | by Jan 1993 – Aug 2013 |
| Union "A" O-11-66170 | Active Iron Energy, LLC only | Old Colony (L. Clearfork) | Andrews | 1 | 48.1K | 119K | by Jan 1993 – May 2026 |
| Deford Unit O-10-11321 | Union Oil Company of California only | Andrews (Wolfcamp) | Andrews | 4 | 42.5K | 69.1K | by Jan 1993 – Sep 1995 |
| Parker, J. E. -D- O-10-284 | Union Oil Company of California only | Andrews (Wolfcamp) | Andrews | 2 | 40.8K | 31.7K | by Jan 1993 – Sep 1995 |
| Parker, J. E. -E- O-10-267 | Union Oil Company of California only | Andrews (Wolfcamp) | Andrews | 4 | 39.8K | 29.3K | by Jan 1993 – Sep 1995 |
| Parker, Bessie O. O-10-33925 | Union Oil Company of California only | Parker (Wolfcamp) | Andrews | 1 | 38.8K | 39.3K | Aug 1993 – Aug 1994 |
| Parker, J. E. O-10-34688 | Union Oil Company of California only | Andrews (Wolfcamp-Penn.) | Andrews | 2 | 38.7K | 47.8K | Oct 1995 – Nov 1997 |
| Linebery, Evelyn, Etal -15- O-10-11711 | Texland Petroleum, L.P. only | Union | Andrews | 3 | 38.2K | 9.55K | by Jan 1993 – Jun 1996 |
| Parker, J. E. -N- O-10-32364 | Union Oil Company of California only | Parker (Pennsylvanian) | Andrews | 1 | 32K | 37.2K | by Jan 1993 – Aug 1994 |
| Parker, J. E. O-10-248 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 2 | 30.2K | 47.3K | Nov 1994 – Sep 1995 |
| Craddock O-10-34402 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 2 | 28.8K | 48.8K | Jan 1995 – Sep 1995 |
| Parker, J. E. -AA- O-10-30495 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 1 | 27.9K | 38.8K | by Jan 1993 – Sep 1995 |
| Logsdon, Etal -D- O-10-13343 | Texland/JMC Joint Venture only | Union | Andrews | 5 | 27.4K | 33.4K | by Jan 1993 – May 1995 |
| Parker, J. E. -AB- O-10-31511 | Union Oil Company of California only | Parker (Wolfcamp) | Andrews | 3 | 26.9K | 47.6K | by Jan 1993 – Aug 1994 |
| State of Texas AG O-10-33954 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 1 | 26.8K | 23.5K | Aug 1993 – Sep 1995 |
| Parker, J. E. -F- O-10-18670 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 2 | 24.5K | 18.8K | Jul 1993 – Sep 1995 |
| Parker, J. E. "C" O-10-33506 | Union Oil Company of California only | Parker (Pennsylvanian) | Andrews | 1 | 22.9K | 25.5K | by Jan 1993 – Jan 1994 |
| Parker, J.E. -P- O-10-30768 | Union Oil Company of California only | Parker (Wolfcamp) | Andrews | 3 | 22.8K | 26.9K | by Jan 1993 – Aug 1994 |
| Clark, Frank O-10-34434 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 1 | 21.2K | 36.2K | Jan 1995 – Sep 1995 |
| Parker, J. E. -E- O-10-246 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 3 | 19.8K | 13.7K | Jul 1993 – Nov 1994 |
| Parker, J. E. "U" (Amoco) O-10-33612 | Union Oil Company of California only | Parker (Wolfcamp) | Andrews | 1 | 19.5K | 36K | by Jan 1993 – Aug 1994 |
| Parker, J.E. -H- O-10-29638 | Union Oil Company of California only | Parker (Wolfcamp) | Andrews | 16 | 19.4K | 16.5K | by Jan 1993 – Aug 1994 |
| Parker, J. E. -Y- O-10-28222 | Union Oil Company of California only | Parker (Pennsylvanian) | Andrews | 4 | 18.6K | 20.2K | by Jan 1993 – Aug 1994 |
| Deford, R. K. O-10-9765 | Union Oil Company of California only | Andrews (Wolfcamp) | Andrews | 2 | 18.6K | 37.2K | by Jan 1993 – Sep 1995 |
| Linebery, Evelyn, Etal -A- O-10-11835 | Texland Petroleum, L.P. only | Union | Andrews | 1 | 18.2K | 5.02K | by Jan 1993 – Jun 1996 |
| Parker, J. E. -AA- O-10-31930 | Union Oil Company of California only | Parker (Pennsylvanian) | Andrews | 3 | 17.3K | 35.1K | by Jan 1993 – Aug 1994 |
| Logsdon -C- O-10-13500 | Texland/JMC Joint Venture only | Union | Andrews | 2 | 16.8K | 7.99K | by Jan 1993 – May 1995 |