| 658851 | Apr 21, 2008 | Apr 21, 2008 | Enervest Operating, L.L.C. | Jasper | Arco Fee Unit A920 #2H | 12,000 | 24130761 |
| 658851Amendment | Apr 21, 2008 | Apr 21, 2008 | Enervest Operating, L.L.C. | Jasper | Arco Fee Unit A920 #2H | 10,651 | 24130761 |
| 658345 | Apr 10, 2008 | Apr 10, 2008 | Enervest Operating, L.L.C. | Rusk | J. O. Poovey #1 | 12,000 | 40134722 |
| 658337 | Apr 10, 2008 | Apr 10, 2008 | Enervest Operating, L.L.C. | Harrison | Resch Gas Unit #12 | 11,500 | 20334382 |
| 658337Amendment | Apr 10, 2008 | Apr 10, 2008 | Enervest Operating, L.L.C. | Harrison | Resch Gas Unit #12 | 13,000 | 20334382 |
| 657416 | Mar 26, 2008 | Mar 26, 2008 | Enervest Operating, L.L.C. | Fayette | Crazy Horse Unit #2H | 13,000 | 14933188 |
| 657327 | Mar 25, 2008 | Mar 25, 2008 | Enervest Operating, L.L.C. | Coke | Fort Chadbourne Odom Lime Unit #8061 | 5,800 | 08131914 |
| 657290 | Mar 25, 2008 | Mar 25, 2008 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #A121 | 5,800 | 39935109 |
| 657253 | Mar 25, 2008 | Mar 25, 2008 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #1118 | 5,800 | 39935108 |
| 656969 | Mar 20, 2008 | Mar 20, 2008 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #1117 | 5,800 | 39935106 |
| 656887 | Mar 19, 2008 | Mar 19, 2008 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #A120 | 5,800 | 39935105 |
| 656006 | Mar 19, 2008 | Mar 19, 2008 | Enervest Operating, L.L.C. | Coke | Odom, S. Alpar Blk. 2 #832 | 5,650 | 08131836 |
| 656868 | Mar 18, 2008 | Mar 18, 2008 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #A119 | 5,800 | 39935104 |
| 655821 | Feb 28, 2008 | Feb 28, 2008 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #1116 | 5,800 | 39935102 |
| 655757 | Feb 28, 2008 | Feb 28, 2008 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #1115 | 5,800 | 39935100 |
| 655719 | Feb 28, 2008 | Feb 28, 2008 | Enervest Operating, L.L.C. | Coke | Fort Chadbourne Odom Lime Unit #2402 | 5,800 | 08131911 |
| 655402 | Feb 25, 2008 | Feb 25, 2008 | Enervest Operating, L.L.C. | Harrison | Jennifer Stewart Gas Unit #9 | 11,500 | 20334324 |
| 655368 | Feb 25, 2008 | Feb 25, 2008 | Enervest Operating, L.L.C. | Harrison | Jennifer Stewart Gas Unit #13 | 11,500 | 20334323 |
| 655368Amendment | Feb 25, 2008 | Feb 25, 2008 | Enervest Operating, L.L.C. | Harrison | Jennifer Stewart Gas Unit #13 | 13,000 | 20334323 |
| 655252 | Feb 22, 2008 | Feb 22, 2008 | Enervest Operating, L.L.C. | Harrison | Jennifer Stewart Gas Unit #17 | 11,500 | 20334321 |
| 655003 | Feb 20, 2008 | Feb 20, 2008 | Enervest Operating, L.L.C. | Coke | Odom, Sallie Flippen #5 | 5,400 | 08100440 |
| 654991 | Feb 20, 2008 | Feb 20, 2008 | Enervest Operating, L.L.C. | Runnels | Odom, Sallie #1100 | 5,650 | 39934912 |
| 654991Amendment | Feb 20, 2008 | Feb 20, 2008 | Enervest Operating, L.L.C. | Runnels | Odom, Sallie #1100 | 5,650 | 39934912 |
| 654905 | Feb 19, 2008 | Feb 19, 2008 | Enervest Operating, L.L.C. | Harrison | Jones Gas Unit #13 | 11,500 | 20334312 |
| 654635 | Feb 13, 2008 | Feb 13, 2008 | Enervest Operating, L.L.C. | Harrison | Loftis Gas Unit #14D | 11,500 | 20334301 |
| 654635Amendment | Feb 13, 2008 | Feb 13, 2008 | Enervest Operating, L.L.C. | Harrison | Loftis Gas Unit #14D | 11,500 | 20334301 |
| 654635Amendment | Feb 13, 2008 | Feb 13, 2008 | Enervest Operating, L.L.C. | Harrison | Loftis Gas Unit #14D | 10,980 | 20334301 |
| 654632 | Feb 13, 2008 | Feb 13, 2008 | Enervest Operating, L.L.C. | Harrison | Loftis Gas Unit #4D | 11,500 | 20334302 |
| 654632Amendment | Feb 13, 2008 | Feb 13, 2008 | Enervest Operating, L.L.C. | Harrison | Loftis Gas Unit #4D | 11,500 | 20334302 |
| 654480 | Feb 11, 2008 | Feb 11, 2008 | Enervest Operating, L.L.C. | Brazos | Stanton Unit #1REH | 13,600 | 04131846 |
| 654480Amendment | Feb 11, 2008 | Feb 11, 2008 | Enervest Operating, L.L.C. | Brazos | Stanton Unit #1REH | 14,773 | 04131846 |
| 654467 | Feb 11, 2008 | Feb 11, 2008 | Enervest Operating, L.L.C. | Brazos | Terry-Terry Unit #2H | 16,000 | 04132007 |
| 654467Amendment | Feb 11, 2008 | Feb 11, 2008 | Enervest Operating, L.L.C. | Brazos | Terry-Terry Unit #2H | 16,000 | 04132007 |
| 653972 | Feb 5, 2008 | Feb 5, 2008 | Enervest Operating, L.L.C. | Rusk | Marks Poovey Gas Unit #3 | 12,000 | 40134637 |
| 653419 | Jan 29, 2008 | Jan 29, 2008 | Enervest Operating, L.L.C. | Fayette | Lincoln OL Unit #1H | 12,000 | 14932846 |
| 652833 | Jan 25, 2008 | Jan 25, 2008 | Enervest Operating, L.L.C. | Lee | Judy #2H | 11,000 | 28732544 |
| 652833Amendment | Jan 25, 2008 | Jan 25, 2008 | Enervest Operating, L.L.C. | Lee | Judy #2H | 11,000 | 28732544 |
| 652889 | Jan 17, 2008 | Jan 17, 2008 | Enervest Operating, L.L.C. | Harrison | Bivins Zeigler Gas Unit #4 | 11,500 | 20334262 |
| 650207 | Jan 15, 2008 | Jan 15, 2008 | Enervest Operating, L.L.C. | Fayette | Pecan Creek #1HH | 14,000 | 14932936 |
| 650752 | Jan 11, 2008 | Jan 11, 2008 | Enervest Operating, L.L.C. | Rusk | Polve #1 | 12,000 | 40133972 |
| 652341 | Jan 9, 2008 | Jan 9, 2008 | Enervest Operating, L.L.C. | Harrison | Jennifer Stewart Gas Unit #14 | 11,500 | 20334253 |
| 652141 | Jan 4, 2008 | Jan 4, 2008 | Enervest Operating, L.L.C. | Rusk | Black Stone Minerals Co. GU #4 | 12,000 | 40134610 |
| 652137 | Jan 4, 2008 | Jan 4, 2008 | Enervest Operating, L.L.C. | Rusk | Poovey Gas Unit #2 | 12,000 | 40134609 |
| 650760 | Jan 4, 2008 | Jan 4, 2008 | Enervest Operating, L.L.C. | Rusk | Fahle #3L | 12,000 | 40133971 |
| 650747 | Jan 3, 2008 | Jan 3, 2008 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 2 #4 | 12,000 | 40134176 |
| 650741 | Jan 3, 2008 | Jan 3, 2008 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 2 #3 | 12,000 | 40133973 |
| 651993 | Jan 2, 2008 | Jan 2, 2008 | Enervest Operating, L.L.C. | Rusk | Goodwin #1 | 12,000 | 40134608 |
| 647865 | Dec 28, 2007 | Dec 28, 2007 | Enervest Operating, L.L.C. | Washington | Barney Unit #2REH | 16,000 | 47730887 |
| 650779 | Dec 12, 2007 | Dec 12, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #3 | 12,000 | 40134198 |
| 650775 | Dec 12, 2007 | Dec 12, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #2 | 12,000 | 40133958 |
| 650774 | Dec 12, 2007 | Dec 12, 2007 | Enervest Operating, L.L.C. | Rusk | Fahle #5 | 12,000 | 40133976 |
| 650770 | Dec 12, 2007 | Dec 12, 2007 | Enervest Operating, L.L.C. | Rusk | Marks Poovey Gas Unit #1 | 12,000 | 40134268 |
| 650769 | Dec 12, 2007 | Dec 12, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #1 | 12,000 | 40133812 |
| 650768 | Dec 12, 2007 | Dec 12, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 2 #8 | 12,000 | 40134461 |
| 650767 | Dec 12, 2007 | Dec 12, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #7 | 12,000 | 40134401 |
| 650766 | Dec 12, 2007 | Dec 12, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #6 | 12,000 | 40134373 |
| 650762 | Dec 12, 2007 | Dec 12, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #5 | 12,000 | 40134374 |
| 650761 | Dec 12, 2007 | Dec 12, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #4 | 12,000 | 40134337 |
| 650720 | Dec 12, 2007 | Dec 12, 2007 | Enervest Operating, L.L.C. | Rusk | Black Stone Minerals Co. GU #1 | 12,000 | 40133771 |
| 650771 | Dec 11, 2007 | Dec 11, 2007 | Enervest Operating, L.L.C. | Rusk | Fahle #4 | 12,000 | 40133975 |
| 650759 | Dec 11, 2007 | Dec 11, 2007 | Enervest Operating, L.L.C. | Rusk | Fahle #2 | 12,000 | 40133730 |
| 650754 | Dec 11, 2007 | Dec 11, 2007 | Enervest Operating, L.L.C. | Rusk | Polve #2 | 12,000 | 40134412 |
| 650737 | Dec 11, 2007 | Dec 11, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 2 #2 | 12,000 | 40133974 |
| 650730 | Dec 11, 2007 | Dec 11, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 2 #1 | 12,000 | 40133959 |
| 650725 | Dec 11, 2007 | Dec 11, 2007 | Enervest Operating, L.L.C. | Rusk | Smith, R. T. #1 | 12,000 | 40134319 |
| 650724 | Dec 11, 2007 | Dec 11, 2007 | Enervest Operating, L.L.C. | Rusk | Poovey Gas Unit #1 | 12,000 | 40134308 |
| 650424 | Dec 10, 2007 | Dec 10, 2007 | Enervest Operating, L.L.C. | Lee | Judy #1REH | 11,000 | 28730508 |
| 649848 | Nov 26, 2007 | Nov 26, 2007 | Enervest Operating, L.L.C. | Harrison | Loftis Gas Unit #13 | 11,500 | 20334198 |
| 649848Amendment | Nov 26, 2007 | Nov 26, 2007 | Enervest Operating, L.L.C. | Harrison | Loftis Gas Unit #13 | 11,500 | 20334198 |
| 649794 | Nov 26, 2007 | Nov 26, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #11 | 12,000 | 40134573 |
| 649788 | Nov 21, 2007 | Nov 21, 2007 | Enervest Operating, L.L.C. | Harrison | Jennifer Stewart Gas Unit #16 | 11,500 | 20334197 |
| 649735 | Nov 21, 2007 | Nov 21, 2007 | Enervest Operating, L.L.C. | Harrison | Loftis Gas Unit #10 | 11,500 | 20334194 |
| 649707 | Nov 21, 2007 | Nov 21, 2007 | Enervest Operating, L.L.C. | Rusk | Kangerga Gas Unit #3 | 12,000 | 40134568 |
| 648863 | Nov 20, 2007 | Nov 20, 2007 | Enervest Operating, L.L.C. | Brazos | Allen #1REH | 16,000 | 04131734 |
| 649280 | Nov 15, 2007 | Nov 15, 2007 | Enervest Operating, L.L.C. | Harrison | Hart Gas Unit #13 | 11,500 | 20334184 |
| 648771 | Nov 7, 2007 | Nov 7, 2007 | Enervest Operating, L.L.C. | Rusk | Black Stone Minerals Co GU #2 | 12,000 | 40134555 |
| 648054 | Oct 24, 2007 | Oct 24, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #10 | 12,000 | 40134540 |
| 648036 | Oct 24, 2007 | Oct 24, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 2 #7 | 12,000 | 40134538 |
| 647478 | Oct 16, 2007 | Oct 16, 2007 | Enervest Operating, L.L.C. | Lee | Griffin-Pruegner #1REH | 11,000 | 28731624 |
| 647136 | Oct 8, 2007 | Oct 8, 2007 | Enervest Operating, L.L.C. | Brazos | Terry-Terry Unit #1REH | 15,000 | 04131544 |
| 646370 | Oct 2, 2007 | Oct 2, 2007 | Enervest Operating, L.L.C. | Coke | EV Cooper #1 | 5,800 | 08131904 |
| 646664 | Sep 28, 2007 | Sep 28, 2007 | Enervest Operating, L.L.C. | Rusk | Kangerga Gas Unit #2 | 12,000 | 40134524 |
| 645006 | Sep 18, 2007 | Sep 18, 2007 | Enervest Operating, L.L.C. | Washington | Becker Unit #1REH | 14,000 | 47730743 |
| 645626 | Sep 12, 2007 | Sep 12, 2007 | Enervest Operating, L.L.C. | Brazos | Abshire-Selected Lands Unit #1REH | 13,000 | 04131981 |
| 633464 | Aug 28, 2007 | Aug 28, 2007 | Enervest Operating, L.L.C. | Coke | Fcolu #8055 | 5,800 | 08131902 |
| 644250 | Aug 15, 2007 | Aug 15, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 2 #8 | 12,000 | 40134461 |
| 644161 | Aug 14, 2007 | Aug 14, 2007 | Enervest Operating, L.L.C. | Harrison | Hart Gas Unit #14 | 11,500 | 20334073 |
| 644109 | Aug 13, 2007 | Aug 13, 2007 | Enervest Operating, L.L.C. | Harrison | Jennifer Stewart Gas Unit #15 | 11,500 | 20334070 |
| 643682 | Aug 9, 2007 | Aug 9, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #9 | 12,000 | 40134448 |
| 643682Amendment | Aug 9, 2007 | Aug 9, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #9 | 12,000 | 40134448 |
| 643633 | Aug 9, 2007 | Aug 9, 2007 | Enervest Operating, L.L.C. | Harrison | Jones Gas Unit #10 | 11,500 | 20334061 |
| 643307 | Aug 4, 2007 | Aug 4, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #8 | 12,000 | 40134439 |
| 643307Amendment | Aug 4, 2007 | Aug 4, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #8 | 12,000 | 40134439 |
| 642871 | Jul 31, 2007 | Jul 31, 2007 | Enervest Operating, L.L.C. | Rusk | Marks Poovey Gas Unit #2 | 12,000 | 40134428 |
| 642871Amendment | Jul 31, 2007 | Jul 31, 2007 | Enervest Operating, L.L.C. | Rusk | Marks Poovey Gas Unit #2 | 12,000 | 40134428 |
| 642773 | Jul 31, 2007 | Jul 31, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit NO.2 #6 | 12,000 | 40134427 |
| 642773Amendment | Jul 31, 2007 | Jul 31, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit NO.2 #6 | 12,000 | 40134427 |
| 642757 | Jul 30, 2007 | Jul 30, 2007 | Enervest Operating, L.L.C. | Harrison | Hart Gas Unit #9 | 11,500 | 20334047 |
| 642723 | Jul 30, 2007 | Jul 30, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 2 #5 | 12,000 | 40134425 |
| 642723Amendment | Jul 30, 2007 | Jul 30, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 2 #5 | 12,000 | 40134425 |