| Thomas O Connor D #1342-391-01818 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (FS-96) | Shut inOil | 6,000 | Dec 22, 2015 | 2 | Jan 2015 |
| O Connor Thos. -B- #5542-391-32924 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (FQ- 9) | PluggedOil | 6,500 | Sep 27, 2013 | 5 | Mar 2018 |
| O Connor Thomas B #1142-391-01823 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (FQ-40 Sand) | PluggedGas | 6,200 | Jul 23, 2010 | 5 | Jul 2011 |
| Thomas O Connor B #3242-391-01811 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (FT-18 Sand) | PluggedGas | 6,000 | Jul 14, 2010 | 3 | Jul 2011 |
| O Connor Thos. -B- #1542-391-01827 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (FQ- 9) | PluggedOil | 6,800 | Dec 31, 2009 | 4 | Mar 2018 |
| O Connor Thomas B #3542-391-01812 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (FQ-40 Sand) | PluggedGas | 6,150 | Apr 2, 2007 | 1 | Jul 2011 |
| Oconnor M. E. #2142-391-01852 | Dolphin Petroleum LP only | RefugioMary Ellen Oconnor (FS-1) | PluggedGas | 5,600 | May 11, 2005 | 1 | Dec 2015 |
| O Conner Mary Ellen #34 U42-391-30081 | Dolphin Petroleum LP only | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 5,955 | Apr 30, 2003 | 3 | Jul 2016 |
| O Connor Thomas B #1342-391-01825 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (FT-5) | PluggedGas | 6,200 | Aug 14, 2000 | 1 | Jul 2011 |
| Hughes J. W. FLP #142-025-32823 | C & E Operating Inc. only | BeeHeard Ranch (4800) | PluggedGas | 5,500 | Feb 1, 2000 | 2 | Feb 2012 |
| O Connor Mary Ellen #c 1042-391-01966 | O Connor Energy Management LLC only | RefugioMary Ellen Oconnor (FS-75) | PluggedOil | 6,055 | Oct 5, 1999 | 2 | Nov 2015 |
| Oconnor Mary Ellen -E- #11 C42-391-01860 | Exxon Corp. only | RefugioMary Ellen Oconnor (FS-96) | Not on scheduleOil | 6,182 | Sep 30, 1999 | 1 | — |
| O Connor Thos. -B- #2542-391-01808 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (FQ- 9) | PluggedOil | 6,200 | Jan 11, 1999 | 3 | Mar 2018 |
| O Connor Mary Ellen #b 1042-391-01880 | Emerald Oil & Gas LC only | RefugioMary Ellen Oconnor (FS-47 Sand) | PluggedGas | 5,800 | Mar 19, 1998 | 3 | Aug 2008 |
| O Connor Mary Ellen #a 342-391-01893 | O Connor Energy Management LLC only | RefugioMary Ellen Oconnor (FS-75) | PluggedOil | 6,030 | Jan 5, 1998 | 5 | Nov 2015 |
| O Connor Thomas B #1742-391-01829 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (H- 50) | PluggedGas | 6,200 | Sep 26, 1997 | 2 | Mar 2018 |
| El Oso Cattle Company #142-391-03687 | Dolphin Petroleum LP only | RefugioWoodsboro South (4200) | PluggedOil | 6,215 | May 2, 1997 | 2 | Aug 2016 |
| Oconnor Mary Ellen #17 U42-391-01870 | Dolphin Petroleum LP only | RefugioMary Ellen Oconnor (FS-96) | PluggedOil | 6,000 | Feb 26, 1996 | 2 | Jul 2016 |
| Oconnor Mary Ellen - Exxon #B1142-391-01881 | Emerald Oil & Gas LC only | RefugioMary Ellen Oconnor (5000) | PluggedGas | 6,600 | Jul 21, 1995 | 4 | Nov 2015 |
| O Connor Mary Ellen #e 1342-391-01862 | Emerald Oil & Gas LC only | RefugioMary Ellen Oconnor (D-1) | PluggedGas | 6,052 | Aug 23, 1994 | 1 | Sep 2001 |
| O Connor Mary Ellen #e 342-391-01939 | Emerald Oil & Gas LC only | RefugioMary Ellen Oconnor (H- 12) | PluggedGas | 6,053 | Aug 23, 1994 | 4 | Nov 2015 |
| O Connor Mary Ellen #e 642-391-01887 | Emerald Oil & Gas LC only | RefugioMary Ellen O Connor (FS-20) | PluggedGas | 78,655 | Aug 9, 1994 | 7 | Nov 2015 |
| Oconnor Mary Ellen -E- #1 U42-391-01854 | Exxon Corp. only | RefugioMary Ellen Oconnor (FS-96) | Not on scheduleOil | 6,200 | Jun 13, 1994 | 1 | — |
| Oconnor Mary Ellen -E- #242-391-01855 | Exxon Corp. only | RefugioMary Ellen Oconnor (FS-96) | Not on scheduleOil | 6,200 | Jun 13, 1994 | 1 | — |
| Oconnor Mary Ellen -B- #1242-391-01882 | Exxon Corp. only | RefugioMary Ellen Oconnor (M-122) | PluggedGas | 6,200 | Jun 13, 1994 | 3 | — |
| O Connor Thomas B #2442-391-01806 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (H-117) | PluggedGas | 6,200 | Sep 24, 1993 | 1 | Feb 2018 |
| O Connor Mary Ellen #e 742-391-01856 | Emerald Oil & Gas LC only | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 6,202 | Aug 2, 1993 | 2 | — |
| O Connor Thomas B #1042-391-01822 | Hilcorp Energy Company only | RefugioMary Ellen O Connor (FS-70) | PluggedOil | 6,230 | Nov 25, 1992 | 6 | May 1999 |
| O Connor Thos. -B- #2842-391-01839 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (FQ- 9) | PluggedOil | 6,200 | Nov 4, 1992 | 3 | Jan 2016 |
| Oconnor Mary Ellen #1442-391-01867 | Dolphin Petroleum LP only | RefugioMary Ellen Oconnor (Stray A) | PluggedOil | 6,400 | Nov 3, 1992 | 3 | Jul 2016 |
| O Connor Thomas B #2642-391-01807 | Quintana Pet. Corp. only | RefugioMary Ellen Oconnor (FS-1) | PluggedGas | 6,200 | Oct 22, 1992 | 2 | May 1995 |
| O Connor Thomas B #1642-391-01828 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (H-117) | PluggedGas | 6,200 | Sep 22, 1992 | 3 | Jan 2016 |
| O Connor Thomas B #3042-391-01840 | Hilcorp Energy Company only | RefugioMary Ellen O Connor (FS-70) | PluggedOil | 6,200 | Sep 22, 1992 | 4 | May 1999 |
| El Oso Cattle Company #10-U42-391-03677 | Citation Oil & Gas Corp. only | RefugioWoodsboro South (4200) | PluggedGas | 6,003 | Aug 19, 1991 | 3 | Mar 1999 |
| Oconnor Thomas -B- #37 F42-391-01842 | Quintana Pet. Corp. only | RefugioWoodsboro South (4200) | PluggedOil | 6,000 | Sep 24, 1990 | 2 | Jan 2016 |
| Oconnor Thos. -B- #8 U42-391-01802 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (FS-96) | PluggedOil | 5,875 | Jul 11, 1990 | 1 | Mar 2018 |
| O Connor Thos. -B- #1842-391-01830 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (FQ- 9) | PluggedOil | 6,118 | Jun 7, 1990 | 4 | Jan 2016 |
| O Connor Thomas B #442-391-01800 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (FQ-25) | PluggedOil | 5,886 | Nov 13, 1989 | 2 | Apr 2015 |
| Oconnor Thos. -B- #27 U42-391-01809 | Hilcorp Energy Company only | RefugioMary Ellen Oconnor (FS-96) | PluggedOil | 6,200 | Jun 13, 1989 | 1 | Jul 2011 |
| Oconnor Thomas James TR #2 #d 16 F42-391-30034 | Exxon Corp. only | RefugioWoodsboro South (4200) | PluggedGas | 5,975 | May 19, 1989 | 4 | — |
| O Connor Mary Ellen #26 D42-391-04027 | Dolphin Petroleum LP only | RefugioWildcat | PluggedOil | 6,100 | Aug 9, 1988 | 3 | Jul 2016 |
| Oconnor Mary Ellen #5342-391-31252 | Dolphin Petroleum LP only | RefugioMary Ellen Oconnor (5000) | PluggedGas | 6,400 | Aug 8, 1988 | 3 | Jul 2016 |
| Oconnor Mary Ellen #1042-391-01848 | Dolphin Petroleum LP only | RefugioWoodsboro South (4200) | PluggedOil | 5,600 | Dec 10, 1987 | 1 | Jul 2016 |
| Oconnor Mary Ellen #1942-391-01871 | Dolphin Petroleum LP only | RefugioWoodsboro South (4200) | PluggedOil | 8,425 | Dec 10, 1987 | 1 | Jul 2016 |
| O Conner Mary Ellen #1 L42-391-01977 | Dolphin Petroleum LP only | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 6,000 | Mar 11, 1987 | 1 | Jul 2016 |
| O Conner Mary Ellen #3042-391-30008 | Dolphin Petroleum LP only | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 5,950 | Mar 11, 1987 | 2 | Jul 2016 |
| O Conner Mary Ellen #4442-391-30585 | Dolphin Petroleum LP only | RefugioMary Ellen Oconnor (FQ-25) | PluggedOil | 6,413 | Mar 2, 1987 | 3 | Jul 2016 |
| El Oso Cattle Company #242-391-03682 | Dolphin Petroleum LP only | RefugioWoodsboro South (4200) | PluggedOil | 6,214 | Sep 19, 1986 | 2 | Aug 2016 |
| O Conner Mary Ellen #2842-391-04041 | Dolphin Petroleum LP only | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 5,950 | May 29, 1985 | 2 | Jul 2016 |
| Oconnor Mary Ellen -F- #742-391-03239 | Exxon Corp. only | RefugioWoodsboro South (4200) | PluggedGas | 6,155 | Nov 12, 1984 | 3 | — |