| Rathmell, J. G. #3042-505-34832 | North Central Oil Corp. | ZapataHundido (9300) | Not on schedule | 10,100 | Oct 20, 2003 | 1 | — |
| Russell - Winch #1542-479-36762 | North Central Oil Corp. | WebbBelle Jeffers (7850) | PluggedGas | 11,000 | May 9, 2003 | 2 | Apr 2001 |
| Belcher W. T. a #2842-039-01273 | North Central Oil Corp. | BrazoriaManvel (1900) | PluggedGas | 5,700 | Jul 10, 2002 | 2 | Nov 2002 |
| Haynes, L. #7942-505-34568 | North Central Oil Corp. | Zapata | Not on schedule | 9,000 | Jun 19, 2002 | 1 | — |
| Snowmass Inc., et al #142-505-34551 | North Central Oil Corp. | Zapata | Not on schedule | 13,500 | Jun 4, 2002 | 1 | — |
| 7-A Investment, Ltd. #242-505-34441 | North Central Oil Corp. | Zapata | Not on schedule | 10,500 | Oct 23, 2001 | 1 | — |
| 7-A Investment Ltd. #142-505-34287 | North Central Oil Corp. | ZapataCharco (9200) | PluggedGas | 10,500 | Feb 9, 2001 | 1 | — |
| McMurrey- Talbert #242-505-34163 | North Central Oil Corp. | ZapataHundido (Lobo) | PluggedGas | 13,000 | Jun 29, 2000 | 2 | Mar 2002 |
| Haynes, L. #4742-505-34155 | North Central Oil Corp. | ZapataLos Mogotes (7400) | Not on schedule | 9,200 | Jun 15, 2000 | 1 | — |
| Sanchez-McMurrey #1442-505-33452 | North Central Oil Corp. | ZapataM & F (Wilcox 6500) | PluggedGas | 11,400 | Mar 22, 2000 | 2 | May 2000 |
| Las Piedras Gas Unit #142-505-34081 | North Central Oil Corp. | ZapataRoleta (Wilcox Consolidated) | PluggedGas | 13,500 | Feb 4, 2000 | 1 | — |
| Jacaman Cattle Company #442-479-37395 | North Central Oil Corp. | WebbBenavides (Lobo Cons.) | Plugged | 11,750 | Dec 28, 1999 | 2 | — |
| H. B. Zachry Unit #242-479-36202 | North Central Oil Corp. | WebbBashara-Hereford (7300) | PluggedGas | 7,000 | Dec 15, 1999 | 2 | Aug 2002 |
| Mann Trust et al #142-505-33989 | North Central Oil Corp. | ZapataRoleta (Wilcox Consolidated) | PluggedGas | 12,750 | Aug 30, 1999 | 2 | Sep 2001 |
| Davis E. F. Trust #542-039-32656 | North Central Oil Corp. | BrazoriaManvel (Miocene 2900) | PluggedGas | 4,200 | Apr 9, 1999 | 3 | Sep 2002 |
| McMurrey-Talbert #142-505-33771 | North Central Oil Corp. | ZapataHundido (Lobo) | PluggedGas | 12,400 | Mar 6, 1998 | 2 | Mar 2002 |
| Zachry H. B. #342-479-36759 | North Central Oil Corp. | WebbRio Bravo (L-6) | PluggedGas | 7,500 | Sep 16, 1997 | 4 | Aug 2002 |
| Gubert 1 #142-039-32620 | North Central Oil Corp. | BrazoriaManvel (F.B. I, Oligocene) | Not on schedule | 6,800 | May 30, 1997 | 1 | — |
| Del Bello #142-039-32617 | North Central Oil Corp. | BrazoriaManvel (F.B. I, Oligocene) | Not on schedule | 7,500 | May 21, 1997 | 1 | — |
| Belcher W. T. B #3442-039-01303 | North Central Oil Corp. | BrazoriaManvel (Basal Miocene) | PluggedGas | 6,757 | Jun 13, 1995 | 2 | — |
| Webb County School Board #1142-479-36277 | North Central Oil Corp. | Webb | Not on schedule | 9,600 | Mar 23, 1995 | 1 | — |
| Hereford Lasker M. B #4842-479-36278 | North Central Oil Corp. | WebbBashara-Hereford (7300) | PluggedGas | 9,000 | Mar 23, 1995 | 1 | Mar 1999 |
| Webb County School Board #1242-479-36279 | North Central Oil Corp. | WebbBig Cowboy (Lobo) | PluggedGas | 9,600 | Mar 23, 1995 | 1 | Feb 1998 |
| Webb County School Board #1342-479-36280 | North Central Oil Corp. | WebbBig Cowboy (Lobo) | PluggedGas | 9,300 | Mar 23, 1995 | 1 | Feb 2003 |
| Hereford L. M. #4642-479-36179 | North Central Oil Corp. | WebbBashara-Hereford (7300) | PluggedGas | 9,700 | Sep 9, 1994 | 1 | Jun 1998 |
| Webb County School Board #842-479-36132 | North Central Oil Corp. | WebbBig Cowboy (Lobo) | PluggedGas | 9,100 | Jul 6, 1994 | 2 | Apr 1998 |
| Colby E. H. et al #142-039-01231 | North Central Oil Corp. | BrazoriaManvel (F.B. I Oligocene) | PluggedOil | 5,000 | May 25, 1994 | 1 | Jun 2002 |
| H. B. Zachry Unit #142-479-36095 | North Central Oil Corp. | WebbZachry (Lobo 6200) | PluggedGas | 7,000 | May 3, 1994 | 1 | Aug 2002 |
| Decarreon G.G. #842-505-33153 | North Central Oil Corp. | ZapataHundido (Lobo) | PluggedGas | 10,950 | Jan 27, 1994 | 1 | Oct 1995 |
| Decarreon G. G. #442-505-32155 | North Central Oil Corp. | ZapataHundido (9300) | PluggedGas | 12,000 | Apr 14, 1993 | 2 | Jan 2000 |
| Pryor Myra S. Trust #142-481-33583 | North Central Oil Corp. | WhartonStimmel West (Frio 4640) | PluggedGas | 5,200 | Aug 21, 1992 | 1 | Sep 1994 |
| Hereford L. M. #642-479-31009 | North Central Oil Corp. | WebbBashara-Hereford (Wilcox 5900) | PluggedGas | 5,590 | Jun 24, 1992 | 2 | Dec 1993 |
| State Tract 279 #342-007-30801 | North Central Oil Corp. | AransasConn Brown Harbor (Frio C ) | PluggedOil | 8,300 | Jan 24, 1992 | 2 | Aug 2017 |
| Gracey #142-089-31844 | North Central Oil Corp. | ColoradoHaber S. (Frio 3140) | PluggedGas | 4,200 | Oct 4, 1991 | 1 | Jun 1996 |
| Wiseman Joseph R. #1HZ42-013-33958 | North Central Oil Corp. | AtascosaCoughran (Austin Chalk) | PluggedOil | 7,000 | Mar 28, 1991 | 1 | — |
| Henderson J. P. et al #142-481-33438 | North Central Oil Corp. | WhartonWildcat | PluggedOil | 8,400 | Sep 12, 1990 | 1 | — |
| Naiser William J. et UX #142-481-33437 | North Central Oil Corp. | WhartonJohnson Creek (Miocene 2620) | PluggedGas | 3,200 | Sep 11, 1990 | 1 | Oct 1996 |
| Hereford -T- #3442-479-35065 | North Central Oil Corp. | WebbBashara-Hereford (7300) | PluggedGas | 8,200 | Jul 13, 1990 | 1 | — |
| Hereford -T- #3342-479-34936 | North Central Oil Corp. | WebbBashara-Hereford (7300) | PluggedGas | 8,200 | Oct 20, 1989 | 1 | Mar 1994 |
| Haynes Leonard Estate #1842-505-32603 | North Central Oil Corp. | ZapataLos Mogotes (7400) | PluggedGas | 8,400 | Oct 6, 1989 | 3 | Aug 2003 |
| Taylor Don Jean et al #142-481-33289 | North Central Oil Corp. | WhartonRio Loco (Yegua) | PluggedGas | 8,200 | Aug 9, 1989 | 2 | Dec 1994 |
| Burkhart Harry G. et al #142-481-33266 | North Central Oil Corp. | WhartonPin Oak (Frio 4585) | PluggedGas | 5,300 | May 26, 1989 | 1 | — |
| Patos Inc #142-481-33252 | North Central Oil Corp. | WhartonLookout Creek (Yegua 7600) | PluggedGas | 8,200 | Apr 20, 1989 | 1 | — |
| H. O. F. A. #542-039-00132 | North Central Oil Corp. | BrazoriaManvel (Miocene 4550) | PluggedOil | 5,651 | Mar 6, 1989 | 4 | — |
| Sob Min. Fee #142-479-34811 | North Central Oil Corp. | WebbBashara-Hereford (7300) | PluggedGas | 9,600 | Jan 24, 1989 | 1 | May 1997 |
| Webb County School Board #742-479-34755 | North Central Oil Corp. | WebbBig Cowboy (Lobo) | PluggedGas | 9,500 | Oct 6, 1988 | 1 | Mar 1999 |
| Hereford -T- #2942-479-34738 | North Central Oil Corp. | WebbWildcat | PluggedGas | 7,500 | Aug 31, 1988 | 1 | — |
| Carriere Louis A. et UX #142-481-33183 | North Central Oil Corp. | WhartonPorter S Creek (Yegua) | PluggedGas | 8,500 | Jul 25, 1988 | 1 | Jun 1994 |
| Halligan O. M. #142-039-00083 | North Central Oil Corp. | BrazoriaManvel (Miocene 3900) | PluggedGas | 4,014 | Dec 17, 1987 | 2 | Sep 2013 |
| Belcher W. T. a #29 F42-039-00217 | North Central Oil Corp. | BrazoriaManvel (Miocene -B- Upper) | PluggedGas | 4,200 | Aug 13, 1987 | 4 | — |