| Headlee Devonian Unit #670142-135-08701 | Four Star Oil and Gas Company only | EctorHeadlee N. (Devonian) | PluggedOil | 12,180 | Dec 8, 2008 | 1 | Oct 2008 |
| Headlee Devonian Unit #6842-135-06589 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | 13,319 | Oct 26, 2007 | 1 | — |
| Headlee Devonian Unit #361142-135-06722 | Diamondback E&P LLC only | EctorHeadlee (Devonian) | ActiveGas | 11,907 | Nov 7, 2005 | 3 | — |
| Headlee Devonian Unit #390842-329-01917 | Chevron U. S. A. Inc. only | MidlandHeadlee (Devonian) | PluggedGas | 13,082 | Nov 9, 2004 | 2 | Apr 2026 |
| Headlee Devonian Unit #381442-329-01913 | Diamondback E&P LLC only | MidlandHeadlee (Devonian) | ActiveGas | 13,424 | Nov 4, 2004 | 2 | Apr 2026 |
| Headlee Devonian Unit #3206R42-329-00154 | Chevron U. S. A. Inc. only | MidlandHeadlee (Devonian) | PluggedGas | 13,350 | Mar 4, 2004 | 2 | — |
| Headlee Devonian Unit #3205 R42-329-00204 | Chevron U. S. A. Inc. only | MidlandHeadlee (Devonian) | PluggedGas | 12,200 | Nov 25, 2003 | 1 | — |
| Headlee Devonian Unit #55HHZ42-135-38490 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | 14,000 | Jul 28, 2003 | 1 | — |
| Headlee Devonian Unit #2507 HHZ42-329-34883 | Chevron U. S. A. Inc. only | MidlandHeadlee (Devonian) | PluggedGas | 13,000 | May 9, 2003 | 1 | — |
| Headlee Devonian Unit #3813HHZ42-329-34851 | Diamondback E&P LLC only | MidlandHeadlee (Devonian) | ActiveGas | 11,879 | Mar 28, 2003 | 2 | — |
| Headlee Devonian Unit #381242-135-06724 | Diamondback E&P LLC only | EctorHeadlee (Devonian) | ActiveGas | 13,289 | Sep 24, 2002 | 2 | Apr 2026 |
| Headlee Devonian Unit #381142-135-06721 | Diamondback E&P LLC only | EctorHeadlee (Devonian) | ActiveGas | 13,114 | Jul 25, 2002 | 2 | Apr 2026 |
| Headlee Devoian Unit #3810HHZ42-135-38229 | Diamondback E&P LLC only | EctorHeadlee (Devonian) | ActiveGas | 12,009 | Jun 14, 2002 | 1 | — |
| Headlee Devonian Unit #422HHZ42-135-06680 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | 16,000 | Jul 12, 2001 | 1 | — |
| Headlee Devonian Unit #13HHZ42-135-10233 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | 16,000 | Jul 12, 2001 | 1 | — |
| Headlee Devonian Unit #493 HHZ42-135-08747 | Four Star Oil and Gas Company only | EctorHeadlee (Devonian) | PluggedGas | 16,000 | Mar 15, 2001 | 1 | — |
| Headlee Devonian Unit #651HHZ42-135-06707 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | 16,000 | Nov 8, 2000 | 1 | — |
| Headlee Devonian Unit #4304HHZ42-135-37863 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | Not on scheduleGas | 16,000 | Jul 31, 2000 | 1 | — |
| Headlee Devonian Unit #6742-135-06593 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | 13,172 | Mar 17, 1999 | 1 | May 1998 |
| Headlee Devonian Unit #433HHZ42-135-37584 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | 14,240 | Nov 7, 1997 | 2 | — |
| Headlee Devonian Unit #301HHZ42-329-01416 | Chevron U. S. A. Inc. only | MidlandHeadlee (Devonian) | PluggedGas | 12,300 | Oct 22, 1996 | 2 | — |
| Headlee Devonian Unit #384A42-135-37093 | Diamondback E&P LLC only | EctorHeadlee (Devonian) | ActiveGas | 12,080 | Jul 21, 1995 | 1 | — |
| McKnight -a- #342-135-06701 | Texaco E & P Inc. only | EctorDora Roberts (Consolidated) | PluggedOil | 12,385 | Nov 7, 1994 | 2 | Feb 2000 |
| Headlee Devonian Unit #290442-135-06731 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | 13,345 | Nov 7, 1991 | 1 | — |
| Headlee Devonian Unit #370942-329-01923 | Chevron U. S. A. Inc. only | MidlandHeadlee (Devonian) | PluggedGas | 13,189 | Jan 25, 1991 | 1 | — |
| Headlee Devonian Unit #14542-135-33912 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | 12,300 | Apr 26, 1982 | 1 | — |
| Headlee Devanian Unit #100842-135-06667 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | 12,250 | Jun 17, 1980 | 1 | — |
| Headlee Devonian Unit #400242-135-06719 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | 13,370 | Sep 18, 1979 | 1 | — |
| Headlee Devonian Unit #201042-135-33163 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | 12,075 | Apr 19, 1979 | 1 | — |
| Headlee Devonian Unit #361042-135-33090 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | 12,375 | Dec 6, 1978 | 1 | — |
| Headlee Devonian Unit #250642-329-01970 | Chevron U. S. A. Inc. only | MidlandHeadlee (Devonian) | PluggedGas | 12,100 | Jun 21, 1978 | 1 | — |
| Foster H.S. B NCT-1 #1 U42-329-01838 | Endeavor Energy Resources L.P. only | MidlandHallanan (Strawn) | PluggedOil | 12,238 | Jun 24, 1977 | 1 | Dec 2002 |
| Headlee Devonian Unit #47142-135-04637 | Four Star Oil and Gas Company only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #56142-135-06587 | Getty Oil Co. only | EctorHeadlee (Devonian) | Not on scheduleGas | — | — | 0 | — |
| Headlee Devonian Unit #6142-135-06599 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #15142-135-06602 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #6242-135-06603 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #1242-135-06604 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #48142-135-06605 | Four Star Oil and Gas Company only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #49242-135-06606 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #49442-135-06607 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #60142-135-06608 | Four Star Oil and Gas Company only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #62142-135-06610 | Getty Oil Co. only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #18142-135-06611 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #10142-135-06612 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #5142-135-06613 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #19142-135-06614 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #20142-135-06615 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #24142-135-06616 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | PluggedGas | — | — | 0 | — |
| Headlee Devonian Unit #44142-135-06617 | Chevron U. S. A. Inc. only | EctorHeadlee (Devonian) | Not on scheduleGas | — | — | 0 | — |