| Oconnor M. E. #2142-391-01852 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (FS-1) | PluggedGas | 5,600 | May 11, 2005 | 1 | Dec 2015 |
| O Conner Mary Ellen #5442-391-31250 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (FQ-30) | PluggedOil | 6,000 | Oct 25, 2004 | 2 | Jul 2016 |
| O Conner Mary Ellen #5542-391-31251 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (FQ-25) | PluggedOil | 6,000 | Oct 25, 2004 | 3 | Jul 2016 |
| O Conner Mary Ellen #34 U42-391-30081 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 5,955 | Apr 30, 2003 | 3 | Jul 2016 |
| O Conner Mary Ellen #4542-391-30584 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 6,400 | Sep 23, 2002 | 5 | Jul 2016 |
| El Oso Cattle Company #142-391-03687 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 6,215 | May 2, 1997 | 2 | Aug 2016 |
| Oconnor Mary Ellen #17 U42-391-01870 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (FS-96) | PluggedOil | 6,000 | Feb 26, 1996 | 2 | Jul 2016 |
| O Conner Mary Ellen #3842-391-30568 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (FQ-30) | PluggedOil | 6,400 | Aug 3, 1995 | 3 | Jul 2016 |
| El Oso Cattle Company #2442-391-31215 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (3100) | PluggedGas | 4,250 | May 30, 1995 | 2 | Aug 2016 |
| Oconnor Mary Ellen #1442-391-01867 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (Stray A) | PluggedOil | 6,400 | Nov 3, 1992 | 3 | Jul 2016 |
| Oconnor Mary Ellen #4342-391-30586 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 6,400 | May 21, 1992 | 2 | Jul 2016 |
| O Conner Mary Ellen #4742-391-30597 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 6,408 | May 15, 1992 | 4 | Jul 2016 |
| El Oso Cattle Company #2042-391-30565 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 5,150 | Aug 30, 1988 | 2 | Aug 2016 |
| O Connor Mary Ellen #26 D42-391-04027 | Dolphin Petroleum LP | RefugioWildcat | PluggedOil | 6,100 | Aug 9, 1988 | 3 | Jul 2016 |
| Oconnor Mary Ellen #5342-391-31252 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (5000) | PluggedGas | 6,400 | Aug 8, 1988 | 3 | Jul 2016 |
| O Conner Mary Ellen #4042-391-30564 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (FQ-30) | PluggedOil | 6,400 | Aug 5, 1988 | 1 | Jul 2016 |
| Oconnor Mary Ellen #1042-391-01848 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 5,600 | Dec 10, 1987 | 1 | Jul 2016 |
| Oconnor Mary Ellen #1942-391-01871 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 8,425 | Dec 10, 1987 | 1 | Jul 2016 |
| El Oso Cattle Co. #2742-391-31217 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (FQ-30) | PluggedOil | 6,150 | Mar 26, 1987 | 3 | — |
| O Conner Mary Ellen #1 L42-391-01977 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 6,000 | Mar 11, 1987 | 1 | Jul 2016 |
| O Conner Mary Ellen #3042-391-30008 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 5,950 | Mar 11, 1987 | 2 | Jul 2016 |
| El Oso Cattle Company #2342-391-31162 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (5000) | PluggedOil | 5,150 | Mar 11, 1987 | 2 | — |
| O Conner Mary Ellen #4442-391-30585 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (FQ-25) | PluggedOil | 6,413 | Mar 2, 1987 | 3 | Jul 2016 |
| Oconnor Mary Ellen #3942-391-30563 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 6,400 | Dec 2, 1986 | 2 | Jul 2016 |
| El Oso Cattle Company #2842-391-31220 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (Stray A) | PluggedOil | 8,500 | Oct 30, 1986 | 4 | — |
| Oconnor Mary Ellen #3642-391-30576 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 6,100 | Oct 29, 1986 | 3 | Jul 2016 |
| O Conner Mary Ellen #5242-391-31249 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 9,500 | Oct 6, 1986 | 2 | Jul 2016 |
| El Oso Cattle Company #242-391-03682 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 6,214 | Sep 19, 1986 | 2 | Aug 2016 |
| El Oso Cattle Company #2142-391-30558 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 5,100 | Aug 8, 1986 | 3 | Aug 2016 |
| O Conner Mary Ellen #2842-391-04041 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 5,950 | May 29, 1985 | 2 | Jul 2016 |
| El Oso Cattle Co. #3042-391-31228 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (FQ-30) | Shut inOil | 6,150 | May 14, 1985 | 2 | — |
| Oconnor Mary Ellen #4242-391-30587 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (Stray A) | PluggedOil | 6,400 | Nov 16, 1984 | 4 | Jul 2016 |
| Oconnor Mary Ellen #542-391-03680 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 5,600 | Nov 30, 1983 | 1 | Jul 2016 |
| Oconnor Mary Ellen #3742-391-30572 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (Stray A) | PluggedOil | 6,100 | Nov 30, 1983 | 2 | Jul 2016 |
| O Conner Mary Ellen #33 U42-391-30076 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 5,950 | Nov 8, 1983 | 1 | Jul 2016 |
| Oconnor Mary Ellen #4142-391-30560 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (Stray A) | PluggedOil | 6,100 | Oct 27, 1983 | 3 | Jul 2016 |
| El Oso Cattle Company #1642-391-30521 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 4,300 | Dec 22, 1982 | 2 | — |
| Oconnor Mary Ellen #942-391-01847 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 5,600 | Dec 8, 1982 | 1 | Jul 2016 |
| Oconnor Mary Ellen #3142-391-30009 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (5000) | PluggedOil | 5,950 | Oct 27, 1982 | 2 | Jul 2016 |
| El Oso Cattle Company #542-391-03684 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 6,000 | Dec 17, 1981 | 1 | Aug 2016 |
| El Oso Cattle Company #1942-391-30557 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (Stray A) | PluggedOil | 5,150 | Jan 9, 1981 | 3 | — |
| O Conner Mary Ellen #7 L42-391-01865 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 6,050 | Sep 8, 1980 | 1 | Jul 2016 |
| El Oso Cattle Company #442-391-03688 | Dolphin Petroleum LP | RefugioWoodsboro South (4200) | PluggedOil | 6,150 | Nov 17, 1978 | 1 | — |
| O Conner Mary Ellen #2542-391-03981 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 5,550 | Oct 31, 1978 | 1 | Jul 2016 |
| O Conner Mary Ellen #2442-391-04055 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 5,550 | Oct 19, 1978 | 1 | Jul 2016 |
| Oconnor Mary Ellen #242-391-03805 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (FS-96) | PluggedOil | 5,600 | Aug 29, 1978 | 1 | — |
| El Oso Cattle Company #2942-391-31219 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (5000) | PluggedOil | 6,150 | Aug 23, 1978 | 2 | — |
| O Conner Mary Ellen #2342-391-01872 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (D-1) | PluggedOil | 6,000 | Apr 12, 1978 | 1 | Jul 2016 |
| El Oso Cattle Company #2542-391-31230 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (Stray A) | PluggedOil | 6,150 | Mar 1, 1978 | 1 | — |
| El Oso Cattle Company #2642-391-31221 | Dolphin Petroleum LP | RefugioMary Ellen Oconnor (Stray A) | PluggedOil | 5,100 | Jan 24, 1978 | 1 | Feb 2002 |