| 642594 | Jul 27, 2007 | Jul 27, 2007 | Enervest Operating, L.L.C. | Rusk | Kangerga Gas Unit #1 | 12,000 | 40134423 |
| 642594Amendment | Jul 27, 2007 | Jul 27, 2007 | Enervest Operating, L.L.C. | Rusk | Kangerga Gas Unit #1 | 12,000 | 40134423 |
| 642168 | Jul 18, 2007 | Jul 18, 2007 | Enervest Operating, L.L.C. | Rusk | Polve #2 | 12,000 | 40134412 |
| 641789 | Jul 11, 2007 | Jul 11, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #7 | 12,000 | 40134401 |
| 641504 | Jul 6, 2007 | Jul 6, 2007 | Enervest Operating, L.L.C. | Harrison | Resch Gas Unit #6 | 11,500 | 20334014 |
| 640644 | Jun 22, 2007 | Jun 22, 2007 | Enervest Operating, L.L.C. | Harrison | Hart Gas Unit #7 | 11,500 | 20334004 |
| 640608 | Jun 21, 2007 | Jun 21, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #6 | 12,000 | 40134373 |
| 640603 | Jun 21, 2007 | Jun 21, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #5 | 12,000 | 40134374 |
| 639733 | Jun 20, 2007 | Jun 20, 2007 | Enervest Operating, L.L.C. | Coke | Fort Chadbourne Odom Lime Unit #859 | 5,800 | 08131901 |
| 640280 | Jun 18, 2007 | Jun 18, 2007 | Enervest Operating, L.L.C. | Harrison | Jennifer Stewart Gas Unit #11 | 11,500 | 20333996 |
| 640048 | Jun 11, 2007 | Jun 11, 2007 | Enervest Operating, L.L.C. | Harrison | Hart Gas Unit #5 | 11,500 | 20333990 |
| 639758 | Jun 7, 2007 | Jun 7, 2007 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #A115 | 5,800 | 39935058 |
| 639757 | Jun 6, 2007 | Jun 6, 2007 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #A116 | 5,800 | 39935059 |
| 639745 | Jun 6, 2007 | Jun 6, 2007 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #A117 | 5,800 | 39935057 |
| 639743 | Jun 6, 2007 | Jun 6, 2007 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #A118 | 5,800 | 39935056 |
| 639738 | Jun 4, 2007 | Jun 4, 2007 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #1110 | 5,800 | 39935055 |
| 639737 | Jun 4, 2007 | Jun 4, 2007 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #1111 | 5,800 | 39935054 |
| 639736 | Jun 4, 2007 | Jun 4, 2007 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #1112 | 5,800 | 39935053 |
| 639734 | Jun 4, 2007 | Jun 4, 2007 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #1114 | 5,800 | 39935052 |
| 639730 | Jun 4, 2007 | Jun 4, 2007 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #2625 | 5,800 | 39935051 |
| 639727 | Jun 4, 2007 | Jun 4, 2007 | Enervest Operating, L.L.C. | Runnels | Fort Chadbourne Odom Lime Unit #1113 | 5,800 | 39935050 |
| 639324 | May 23, 2007 | May 23, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #4 | 12,000 | 40134337 |
| 638598 | May 16, 2007 | May 16, 2007 | Enervest Operating, L.L.C. | Coke | Fcolu #2401 | 5,800 | 08131899 |
| 638594 | May 16, 2007 | May 16, 2007 | Enervest Operating, L.L.C. | Coke | Fcolu #2504 | 5,800 | 08131900 |
| 638434 | May 14, 2007 | May 14, 2007 | Enervest Operating, L.L.C. | Rusk | Smith, R. T. #1 | 12,000 | 40134319 |
| 638460 | May 12, 2007 | May 12, 2007 | Enervest Operating, L.L.C. | Rusk | Fahle #3 | 11,500 | 40133971 |
| 637569 | Apr 26, 2007 | Apr 26, 2007 | Enervest Operating, L.L.C. | Rusk | Poovey Gas Unit #1 | 12,000 | 40134308 |
| 635507 | Mar 27, 2007 | Mar 27, 2007 | Enervest Operating, L.L.C. | Rusk | Marks Poovey Gas Unit #1 | 11,000 | 40134268 |
| 635142 | Mar 20, 2007 | Mar 20, 2007 | Enervest Operating, L.L.C. | Harrison | Hunt Gas Unit #12 | 11,200 | 20333870 |
| 635142Amendment | Mar 20, 2007 | Mar 20, 2007 | Enervest Operating, L.L.C. | Harrison | Hunt Gas Unit #12 | 11,200 | 20333870 |
| 635137 | Mar 20, 2007 | Mar 20, 2007 | Enervest Operating, L.L.C. | Harrison | Hunt Gas Unit #14 | 11,200 | 20333867 |
| 635136 | Mar 20, 2007 | Mar 20, 2007 | Enervest Operating, L.L.C. | Harrison | Hunt Gas Unit #2 | 11,200 | 20333868 |
| 633550 | Mar 14, 2007 | Mar 14, 2007 | Enervest Operating, L.L.C. | Runnels | Fcolu #A111 | 5,800 | 39935037 |
| 633511 | Mar 14, 2007 | Mar 14, 2007 | Enervest Operating, L.L.C. | Coke | Fcolu #840 | 5,800 | 08131898 |
| 633518 | Mar 13, 2007 | Mar 13, 2007 | Enervest Operating, L.L.C. | Coke | Fcolu #849 | 5,800 | 08131897 |
| 632728 | Feb 2, 2007 | Feb 2, 2007 | Enervest Operating, L.L.C. | Harrison | Resch Gas Unit #8 | 11,500 | 20333820 |
| 632308 | Jan 25, 2007 | Jan 25, 2007 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #3 | 11,300 | 40134198 |
| 629915Amendment | Jan 24, 2007 | Jan 24, 2007 | Enervest Operating, L.L.C. | Lee | Two Fingers Unit #2REH | 9,900 | 28730400 |
| 632123 | Jan 23, 2007 | Jan 23, 2007 | Enervest Operating, L.L.C. | Harrison | Jennifer Stewart Gas Unit #4 | 11,350 | 20333805 |
| 630891 | Dec 21, 2006 | Dec 21, 2006 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit NO.2 #4 | 12,000 | 40134176 |
| 627719 | Oct 18, 2006 | Oct 18, 2006 | Enervest Operating, L.L.C. | Rusk | Shaw, R. W. #5 | 12,000 | 40134113 |
| 627718 | Oct 18, 2006 | Oct 18, 2006 | Enervest Operating, L.L.C. | Rusk | Shaw, R. W. #4 | 12,000 | 40134112 |
| 627717 | Oct 18, 2006 | Oct 18, 2006 | Enervest Operating, L.L.C. | Rusk | Shaw, R. W. #3 | 12,000 | 40134111 |
| 627715 | Oct 18, 2006 | Oct 18, 2006 | Enervest Operating, L.L.C. | Rusk | Shaw, R. W. #2 | 12,000 | 40134110 |
| 627545 | Oct 16, 2006 | Oct 16, 2006 | Enervest Operating, L.L.C. | Harrison | Bailey Gas Unit #2 | 11,200 | 20333699 |
| 627311 | Oct 11, 2006 | Oct 11, 2006 | Enervest Operating, L.L.C. | Harrison | Bivins Zeigler Gas Unit #2 | 11,500 | 20333696 |
| 626469 | Oct 4, 2006 | Oct 4, 2006 | Enervest Operating, L.L.C. | Coke | Fcolu #3338 | 5,700 | 08131882 |
| 626467 | Oct 4, 2006 | Oct 4, 2006 | Enervest Operating, L.L.C. | Coke | Fcolu #8048 | 5,700 | 08131881 |
| 625795 | Sep 12, 2006 | Sep 12, 2006 | Enervest Operating, L.L.C. | Coke | Fort Chadbourne Odom Lime Unit #8052 | 5,625 | 08131878 |
| 625794 | Sep 12, 2006 | Sep 12, 2006 | Enervest Operating, L.L.C. | Coke | Fort Chadbourne Odom Lime Unit #8039 | 5,600 | 08131877 |
| 625793 | Sep 12, 2006 | Sep 12, 2006 | Enervest Operating, L.L.C. | Coke | Fort Chadbourne Odom Lime Unit #8053 | 5,620 | 08131879 |
| 625792 | Sep 12, 2006 | Sep 12, 2006 | Enervest Operating, L.L.C. | Coke | Fort Chadbourne Odom Lime Unit #8058 | 5,600 | 08131880 |
| 625760Amendment | Sep 12, 2006 | Sep 12, 2006 | Enervest Operating, L.L.C. | Fayette | Foerster-Donovan Unit #1REH | 13,000 | 14932617 |
| 625719 | Sep 12, 2006 | Sep 12, 2006 | Enervest Operating, L.L.C. | Rusk | Black Stone Minerals Co. GU NO.1 #3 | 11,500 | 40134060 |
| 625719Amendment | Sep 12, 2006 | Sep 12, 2006 | Enervest Operating, L.L.C. | Rusk | Black Stone Minerals Co. GU NO.1 #3 | 11,500 | 40134060 |
| 624057 | Aug 16, 2006 | Aug 16, 2006 | Enervest Operating, L.L.C. | Coke | Fcolu #4701 | 5,700 | 08131846 |
| 623992 | Aug 15, 2006 | Aug 15, 2006 | Enervest Operating, L.L.C. | Runnels | Fcolu #1109 | 5,700 | 39934998 |
| 623990 | Aug 15, 2006 | Aug 15, 2006 | Enervest Operating, L.L.C. | Runnels | Fcolu #1108 | 5,700 | 39934997 |
| 623988 | Aug 15, 2006 | Aug 15, 2006 | Enervest Operating, L.L.C. | Runnels | Fcolu #1107 | 5,700 | 39934996 |
| 624003Amendment | Aug 14, 2006 | Aug 14, 2006 | Enervest Operating, L.L.C. | Lee | Zgabay Unit #3REH | 9,915 | 28730979 |
| 623968 | Aug 11, 2006 | Aug 11, 2006 | Enervest Operating, L.L.C. | Runnels | Fcolu #1106 | 5,700 | 39934993 |
| 622866 | Jul 20, 2006 | Jul 20, 2006 | Enervest Operating, L.L.C. | Harrison | Resch Gas Unit SWD #1 | 4,500 | 20333588 |
| 622801 | Jul 19, 2006 | Jul 19, 2006 | Enervest Operating, L.L.C. | Harrison | Loftis Gas Unit #2 | 11,500 | 20333587 |
| 622801Amendment | Jul 19, 2006 | Jul 19, 2006 | Enervest Operating, L.L.C. | Harrison | Loftis Gas Unit #7 | 11,500 | 20333587 |
| 622799 | Jul 19, 2006 | Jul 19, 2006 | Enervest Operating, L.L.C. | Harrison | Stewart Gas Unit #5 | 11,500 | 20333586 |
| 621526 | Jun 26, 2006 | Jun 26, 2006 | Enervest Operating, L.L.C. | Rusk | Fahle #5 | 11,500 | 40133976 |
| 621525 | Jun 26, 2006 | Jun 26, 2006 | Enervest Operating, L.L.C. | Harrison | Hart Gas Unit #3 | 11,500 | 20333545 |
| 621525Amendment | Jun 26, 2006 | Jun 26, 2006 | Enervest Operating, L.L.C. | Harrison | Hart Gas Unit #3 | 11,500 | 20333545 |
| 621532 | Jun 23, 2006 | Jun 23, 2006 | Enervest Operating, L.L.C. | Rusk | Fahle #4 | 11,500 | 40133975 |
| 621531 | Jun 23, 2006 | Jun 23, 2006 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 2 #2 | 11,500 | 40133974 |
| 621529 | Jun 23, 2006 | Jun 23, 2006 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit NO.2 #3 | 11,500 | 40133973 |
| 621528 | Jun 23, 2006 | Jun 23, 2006 | Enervest Operating, L.L.C. | Rusk | Polve #1 | 11,500 | 40133972 |
| 621528Amendment | Jun 23, 2006 | Jun 23, 2006 | Enervest Operating, L.L.C. | Rusk | Polve #1 | 11,500 | 40133972 |
| 621528Amendment | Jun 23, 2006 | Jun 23, 2006 | Enervest Operating, L.L.C. | Rusk | Polve #1 | 12,500 | 40133972 |
| 621527 | Jun 23, 2006 | Jun 23, 2006 | Enervest Operating, L.L.C. | Rusk | Fahle #3 | 11,500 | 40133971 |
| 620664 | Jun 9, 2006 | Jun 9, 2006 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit NO.2 #1 | 11,300 | 40133959 |
| 620656 | Jun 9, 2006 | Jun 9, 2006 | Enervest Operating, L.L.C. | Rusk | Harrell Gas Unit No. 1 #2 | 11,300 | 40133958 |
| 619765 | May 23, 2006 | May 23, 2006 | Enervest Operating, L.L.C. | Harrison | Resch Gas Unit #7 | 11,200 | 20333504 |
| 619764 | May 23, 2006 | May 23, 2006 | Enervest Operating, L.L.C. | Harrison | Resch Gas Unit #11 | 11,200 | 20333503 |
| 618525Amendment | May 2, 2006 | May 2, 2006 | Enervest Operating, L.L.C. | Coke | Fort Chadbourne Odom Lime Unit #3335 | 5,700 | 08131859 |
| 618229 | Apr 26, 2006 | Apr 26, 2006 | Enervest Operating, L.L.C. | Harrison | Loftis Gas Unit #6 | 11,200 | 20333484 |
| 612733 | Jan 20, 2006 | Jan 20, 2006 | Enervest Operating, L.L.C. | Rusk | Emma Ann Harrell #2 | 11,300 | 40133812 |
| 612554Amendment | Jan 18, 2006 | Jan 18, 2006 | Enervest Operating, L.L.C. | Parker | Edwards #A 2 HH | 6,750 | 36733876 |
| 611404 | Dec 21, 2005 | Dec 21, 2005 | Enervest Operating, L.L.C. | Rusk | Blackstone Minerals Company UT #1 | 11,300 | 40133771 |
| 608805 | Nov 1, 2005 | Nov 1, 2005 | Enervest Operating, L.L.C. | Rusk | Fahle #2 | 11,300 | 40133730 |
| 606959Amendment | Sep 27, 2005 | Sep 27, 2005 | Enervest Operating, L.L.C. | Harrison | Stewart Gas Unit #10 | 11,300 | 20333301 |
| 606933Amendment | Sep 27, 2005 | Sep 27, 2005 | Enervest Operating, L.L.C. | Harrison | Loftis Gas Unit #5 | 11,300 | 20333299 |
| 606933Amendment | Sep 27, 2005 | Sep 27, 2005 | Enervest Operating, L.L.C. | Harrison | Loftis Gas Unit #5 | 11,300 | 20333299 |
| 601002 | May 20, 2005 | May 20, 2005 | Enervest Operating, L.L.C. | Howard | Dodge, G. M. #96 | 2,950 | 22735949 |
| 600775 | May 17, 2005 | May 17, 2005 | Enervest Operating, L.L.C. | Howard | G M Dodge #97 | 2,950 | 22735948 |
| 561026 | May 2, 2005 | May 2, 2005 | Enervest Operating, L.L.C. | Mitchell | Elder, P. 1 #14 | 2,895 | 33534509 |
| 561026Amendment | May 2, 2005 | May 2, 2005 | Enervest Operating, L.L.C. | Mitchell | Elder, P. 1 #14 | 2,895 | 33534509 |
| 561089 | Apr 26, 2005 | Apr 26, 2005 | Enervest Operating, L.L.C. | Mitchell | Adams, C. M. 2 #11 | 2,925 | 33534508 |
| 561025 | Apr 25, 2005 | Apr 25, 2005 | Enervest Operating, L.L.C. | Mitchell | Pettitfils, J. D. #12 | 2,895 | 33534506 |
| 561025Amendment | Apr 25, 2005 | Apr 25, 2005 | Enervest Operating, L.L.C. | Mitchell | Pettitfils, J. D. "A" #12 | 2,895 | 33534506 |
| 559431 | Mar 23, 2005 | Mar 23, 2005 | Enervest Operating, L.L.C. | Mitchell | Miller, H.C. #30 | 3,400 | 33534499 |
| 559431Amendment | Mar 23, 2005 | Mar 23, 2005 | Enervest Operating, L.L.C. | Mitchell | Miller, H.C. #30 | 2,895 | 33534499 |
| 559430 | Mar 23, 2005 | Mar 23, 2005 | Enervest Operating, L.L.C. | Mitchell | Enervest Fee-A.j.watson #29 | 3,400 | 33534505 |
| 559429 | Mar 23, 2005 | Mar 23, 2005 | Enervest Operating, L.L.C. | Mitchell | Clark, J.W. #15 | 3,400 | 33534504 |
| 559428 | Mar 23, 2005 | Mar 23, 2005 | Enervest Operating, L.L.C. | Mitchell | E.T. Strain "C" #13 | 3,400 | 33534503 |