| McCutchen W.A. #542-495-04122 | Hilcorp Energy Company only | WinklerKeystone South | Shut inOil | 9,920 | Jul 12, 2019 | 1 | Apr 2026 |
| Fernandes SWD #142-495-20118 | Owl SWD Operating LLC only | WinklerKeystone (Ellenburger) | PluggedOil | 12,300 | Oct 26, 2016 | 1 | — |
| Walton J. B. #1842-495-03894 | Hilcorp Energy Company only | WinklerKeystone (Dev-McKee Cons) | Shut inOil | 9,948 | Jul 27, 2016 | 3 | Mar 2026 |
| South Keystone/Ellen/Unit #107342-495-01153 | Basin Oil & Gas Operating LLC only | WinklerKeystone (Ellenburger) | ActiveGas | 9,842 | Nov 18, 2011 | 1 | Apr 2026 |
| Walton J.B. a #542-495-04572 | Hilcorp Energy Company only | WinklerKeystone (Dev-McKee Cons) | ActiveOil | 10,011 | Aug 24, 2011 | 1 | Jan 2025 |
| Walton J.B. a #842-495-04483 | Hilcorp Energy Company only | WinklerKeystone (Dev-McKee Cons) | Shut inOil | 10,044 | Mar 17, 2011 | 2 | Jan 2025 |
| Walton J.B. a #742-495-04556 | Hilcorp Energy Company only | WinklerKeystone (Dev-McKee Cons) | ActiveGas | 10,004 | Mar 15, 2011 | 1 | Jan 2025 |
| Bashara M. J. #3042-495-03723 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Shut inOil | 10,390 | Nov 29, 2010 | 2 | Feb 2020 |
| Walton J. B. a #442-495-04569 | XTO Energy Inc. only | WinklerKeystone (Ellenburger) | PluggedGas | 9,830 | Apr 23, 2008 | 3 | Jul 2017 |
| Keystone Holt Unit #9359HHZ42-495-10051 | Basin Oil & Gas Operating LLC only | WinklerKeystone (Consolidated) | Shut inOil | 9,936 | Mar 3, 2008 | 1 | Apr 2026 |
| South Keystone/Ellen/Unit #140342-495-33267 | Basin Oil & Gas Operating LLC only | WinklerKeystone (Ellenburger) | Temporarily abandonedGas | 10,853 | Sep 28, 2007 | 1 | Jul 2016 |
| South Keystone /Ellen/ Unit #140242-495-01162 | Basin Oil & Gas Operating LLC only | WinklerKeystone (Ellenburger) | Shut inOil | 10,008 | Aug 4, 2007 | 1 | Feb 2019 |
| South Keystone/Ellen/Unit #70142-495-04284 | Basin Oil & Gas Operating LLC only | WinklerKeystone (Ellenburger) | Temporarily abandonedGas | 9,998 | Aug 4, 2007 | 1 | Feb 2019 |
| South Keystone /Ellen/ Unit #112142-495-01275 | Basin Oil & Gas Operating LLC only | WinklerKeystone (Ellenburger) | PluggedOil | 10,100 | Aug 17, 2006 | 1 | Mar 2016 |
| South Keystone/Ellen/Unit #140142-495-33044 | Basin Oil & Gas Operating LLC only | WinklerKeystone (Ellenburger) | Temporarily abandonedGas | 10,618 | Jun 10, 2005 | 2 | Mar 2016 |
| Jenkins B.F. et al (Deep) #342-495-01841 | XTO Energy Inc. only | WinklerKeystone (Ellenburger) | PluggedGas | 10,300 | Mar 8, 2005 | 1 | May 2014 |
| Pure-Walton #2 E42-495-00415 | XTO Energy Inc. only | WinklerKeystone (Ellenburger) | PluggedGas | 10,000 | May 18, 1998 | 3 | May 2021 |
| B A S H #542-495-03424 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Temporarily abandonedGas | 10,122 | Mar 18, 1997 | 1 | Jan 2020 |
| Walton J. B. #2842-495-03904 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Temporarily abandonedGas | 9,900 | Jan 26, 1994 | 3 | Jun 2020 |
| South Keystone /Ellen/ Unit #1064R42-495-01144 | Basin Oil & Gas Operating LLC only | WinklerKeystone (Ellenburger) | PluggedOil | 10,062 | Dec 9, 1993 | 1 | Feb 2019 |
| South Keystone /Ellen/ Unit #3004R42-495-04292 | Basin Oil & Gas Operating LLC only | WinklerKeystone (Ellenburger) | Temporarily abandonedGas | 10,219 | Oct 4, 1993 | 1 | Mar 2016 |
| Pure-Walton #9E42-495-00458 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Shut inOil | 10,001 | Jun 2, 1993 | 3 | Apr 2021 |
| Keystone Silurian Unit #5542-495-04287 | XTO Energy Inc. only | WinklerKeystone (Silurian) | PluggedOil | 9,878 | May 18, 1993 | 3 | Feb 2019 |
| Pure-Walton #10E42-495-00447 | XTO Energy Inc. only | WinklerKeystone (Ellenburger) | PluggedGas | 9,967 | Jan 19, 1993 | 2 | Apr 2021 |
| Pure-Walton #13E42-495-00455 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Shut inOil | 10,000 | Dec 9, 1992 | 1 | Apr 2021 |
| Pure Walton #11E42-495-00448 | Hilcorp Energy Company only | WinklerKeystone SW. (San Andres) | PluggedOil | 5,000 | Dec 1, 1992 | 1 | Feb 2024 |
| Pure-Walton #14E42-495-00456 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Temporarily abandonedGas | 10,000 | Dec 1, 1992 | 1 | Apr 2021 |
| B A S H #742-495-03422 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Shut inOil | 10,030 | Sep 30, 1992 | 2 | Jul 2019 |
| Pure-Walton #5E42-495-00412 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Temporarily abandonedGas | 9,875 | Sep 25, 1991 | 2 | Dec 2022 |
| Pure-Walton #7E42-495-00451 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Shut inOil | 9,914 | Jun 21, 1991 | 1 | Apr 2021 |
| Walton J. B. #1742-495-03893 | Hilcorp Energy Company only | WinklerKeystone (Dev-McKee Cons) | ActiveOil | 9,893 | Dec 18, 1990 | 2 | Mar 2026 |
| Pure-Walton #3E42-495-00414 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Temporarily abandonedGas | 9,878 | Oct 2, 1990 | 1 | Apr 2021 |
| Pure Walton #6 E42-495-00452 | XTO Energy Inc. only | WinklerKeystone (Ellenburger) | PluggedGas | 9,780 | Jul 18, 1990 | 2 | Apr 2021 |
| Walton J. B. -a- #942-495-04532 | Arco Oil & Gas Co. only | WinklerKeystone (Silurian) | PluggedOil | 10,046 | Jul 26, 1989 | 1 | — |
| Bashara M.J. #842-495-03839 | Hilcorp Energy Company only | WinklerKeystone (Dev-McKee Cons) | Shut inOil | 9,940 | Sep 26, 1985 | 1 | Apr 2026 |
| Bashara M.J. #2042-495-03728 | El Paso Natural Gas Company only | WinklerKeystone (San Andres) | PluggedOil | 9,917 | Jun 18, 1985 | 1 | — |
| Walton J. B. #2742-495-03903 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Shut inOil | 10,300 | Nov 16, 1984 | 1 | Jun 2020 |
| Bashara M. J. #2342-495-03716 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Shut inOil | 9,567 | Jul 2, 1984 | 1 | Feb 2020 |
| Keystone Cattle Co. #77 C42-495-01157 | Gulf Oil Corp. only | WinklerKeystone (McKee) | PluggedGas | 10,007 | Feb 13, 1984 | 2 | — |
| Walton J. B. #3142-495-03907 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Temporarily abandonedGas | 9,791 | Aug 22, 1983 | 2 | Aug 2024 |
| Walton J. B. #19 D42-495-03895 | Hilcorp Energy Company only | WinklerKeystone (Dev-McKee Cons) | ActiveGas | 9,900 | Jun 23, 1983 | 2 | Apr 2026 |
| Keystone Silurian Unit #2042-495-01150 | Hilcorp Energy Company only | WinklerKeystone (Dev-McKee Cons) | PluggedOil | 9,749 | Dec 30, 1980 | 1 | Apr 2026 |
| Keystone Conoco #242-495-00298 | BTA Oil Producers only | WinklerKeystone (Holt) | PluggedOil | 9,730 | Nov 6, 1980 | 1 | — |
| Bashara M.J. #25S42-495-03718 | Hilcorp Energy Company only | WinklerKeystone (Dev-McKee Cons) | PluggedOil | 9,925 | Oct 24, 1980 | 1 | Apr 2026 |
| Walton J. B. #6942-495-00273 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | PluggedOil | — | — | 0 | — |
| Keystone Conoco #1 L42-495-00297 | BTA Oil Producers only | WinklerKeystone (Ellenburger) | Not on scheduleOil | — | — | 0 | — |
| Pure-Walton #4EB42-495-00410 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | Temporarily abandonedGas | 9,835 | — | 0 | — |
| Pure Walton #8E42-495-00454 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | ActiveGas | 9,724 | — | 0 | — |
| Pure-Walton #12E42-495-00462 | Hilcorp Energy Company only | WinklerKeystone (Ellenburger) | PluggedOil | — | — | 0 | — |
| Bashara -E- #142-495-00691 | Gen. Amer. Oil Co. of Texas only | WinklerKeystone (Ellenburger) | PluggedOil | — | — | 0 | — |