| 620625 | Jun 13, 2006 | Jun 13, 2006 | Encana Oil & Gas(usa) Inc. | Massey, Kenneth #1HH | 9,000 | 22131121 |
| 620734 | Jun 12, 2006 | Jun 12, 2006 | Chief Oil & Gas LLC | Ator #1HH | 8,900 | 22131123 |
| 620734Amendment | Jun 12, 2006 | Jun 12, 2006 | Devon Energy Production Co, L.P. | Ator GU "A" #1HH | 9,000 | 22131123 |
| 620731 | Jun 9, 2006 | Jun 9, 2006 | Chief Oil & Gas LLC | Ator #2HH | 8,900 | 22131122 |
| 620731Amendment | Jun 9, 2006 | Jun 9, 2006 | Devon Energy Production Co, L.P. | Ator #1HH | 8,900 | 22131122 |
| 619535 | Jun 5, 2006 | Jun 5, 2006 | Devon Energy Production Co, L.P. | Christine's Lucky Draw #1H | 9,000 | 22131117 |
| 619535Amendment | Jun 5, 2006 | Jun 5, 2006 | Devon Energy Production Co, L.P. | Christine's Lucky Draw #1H | 9,000 | 22131117 |
| 620229 | Jun 1, 2006 | Jun 1, 2006 | Range Production Company | Mitchell Ranch #1HH | 9,850 | 22131120 |
| 620229Amendment | Jun 1, 2006 | Jun 1, 2006 | Range Production Company | Mitchell Ranch #1HH | 9,850 | 22131120 |
| 620229Amendment | Jun 1, 2006 | Jun 1, 2006 | Range Production Company | Mitchell Ranch #1HH | 9,850 | 22131120 |
| 619998 | May 26, 2006 | May 26, 2006 | Arrington,david H. Oil & Gas,inc | Parachute Hopper #1HH | 7,200 | 22131119 |
| 619742 | May 23, 2006 | May 23, 2006 | Burlington Resources O & G Co LP | Courts Cleveland C #4HH | 9,000 | 22131118 |
| 619405 | May 18, 2006 | May 18, 2006 | Ged Operating LLC | Wind Dancer #1HH | 5,760 | 22131116 |
| 619405Amendment | May 18, 2006 | May 18, 2006 | Ged Operating LLC | Wind Dancer #1HH | 6,890 | 22131116 |
| 619221 | May 12, 2006 | May 12, 2006 | Chief Oil & Gas LLC ** | Swaim Unit #1HH | 8,900 | 22131115 |
| 619022 | May 10, 2006 | May 10, 2006 | Carrizo Oil & Gas, Inc. | Tomlinson #1HH | 7,500 | 22131114 |
| 619022Amendment | May 10, 2006 | May 10, 2006 | Carrizo Oil & Gas, Inc. | Tomlinson #1HH | 7,500 | 22131114 |
| 618473 | May 10, 2006 | May 10, 2006 | EOG Resources, Inc. | Fred Crowder Unit #1HH | 7,000 | 22131112 |
| 618797 | May 8, 2006 | May 8, 2006 | Quicksilver Resources Inc. | Officers Club SWD #1 | 10,000 | 22131113 |
| 618545 | May 2, 2006 | May 2, 2006 | Quicksilver Resources Inc. | Marshall, Sam "A" #1HH | 6,600 | 22131111 |
| 618539 | May 2, 2006 | May 2, 2006 | Quicksilver Resources Inc. | Hawkeye Unit #2HH | 6,400 | 22131110 |
| 618510 | May 2, 2006 | May 2, 2006 | Pinnergy, Inc. | Parker #1D | 5,200 | 22131109 |
| 618510Amendment | May 2, 2006 | May 2, 2006 | Pinnergy, Inc. | Parker #1D | 5,200 | 22131109 |
| 617654 | Apr 17, 2006 | Apr 17, 2006 | Burlington Resources O & G Co LP | Bowser Ranch #3HH | 9,000 | 22131108 |
| 617203 | Apr 7, 2006 | Apr 7, 2006 | Carrizo Oil & Gas, Inc. | Brawner Unit #1HH | 7,500 | 22131107 |
| 617134 | Apr 6, 2006 | Apr 6, 2006 | Burlington Resources O & G Co LP | Behrens B Unit #3HH | 9,000 | 22131106 |
| 616672 | Apr 6, 2006 | Apr 6, 2006 | Encana Oil & Gas(usa) Inc. | Stewart Unit #1HH | 9,000 | 22131105 |
| 616672Amendment | Apr 6, 2006 | Apr 6, 2006 | Encana Oil & Gas(usa) Inc. | Stewart Unit #1HH | 9,000 | 22131105 |
| 616650 | Mar 29, 2006 | Mar 29, 2006 | Quicksilver Resources Inc. | Tejas Western #1HH | 6,600 | 22131104 |
| 616124 | Mar 27, 2006 | Mar 27, 2006 | Quicksilver Resources Inc. | Kimmel Unit #1HH | 6,600 | 22131102 |
| 616202 | Mar 22, 2006 | Mar 22, 2006 | Burlington Resources O & G Co LP | Courts Cleveland C #3HH | 9,000 | 22131101 |
| 615941 | Mar 16, 2006 | Mar 16, 2006 | Burlington Resources O & G Co LP | Georges Creek Ranch #14HH | 9,000 | 22131100 |
| 615662 | Mar 10, 2006 | Mar 10, 2006 | Adkins, R. L. Corp. | Hopper #1HH | 6,500 | 22131099 |
| 615637 | Mar 10, 2006 | Mar 10, 2006 | XTO Energy Inc. | Wilhoit #4HH | 9,000 | 22131098 |
| 615637Amendment | Mar 10, 2006 | Mar 10, 2006 | XTO Energy Inc. | Wilhoit #4HH | 9,000 | 22131098 |
| 615463 | Mar 8, 2006 | Mar 8, 2006 | Burlington Resources O & G Co LP | Kidd #2HH | 9,000 | 22131097 |
| 615390 | Mar 7, 2006 | Mar 7, 2006 | Quicksilver Resources Inc. | Haywire #1HH | 6,600 | 22131096 |
| 615390Amendment | Mar 7, 2006 | Mar 7, 2006 | Quicksilver Resources Inc. | Haywire #1HH | 6,600 | 22131096 |
| 614744 | Feb 27, 2006 | Feb 27, 2006 | EOG Resources, Inc. | Rhoades #1HH | 5,500 | 22131094 |
| 614625 | Feb 27, 2006 | Feb 27, 2006 | Quicksilver Resources Inc. | Bob Denver Unit #1HH | 6,400 | 22131093 |
| 614619 | Feb 27, 2006 | Feb 27, 2006 | Quicksilver Resources Inc. | Bob Denver Unit #2HH | 6,400 | 22131095 |
| 614416 | Feb 24, 2006 | Feb 24, 2006 | Quicksilver Resources Inc. | Hinton #1HH | 6,400 | 22131092 |
| 614125 | Feb 22, 2006 | Feb 22, 2006 | Quicksilver Resources Inc. | Chrissy Unit #1HH | 6,400 | 22131091 |
| 613808 | Feb 15, 2006 | Feb 15, 2006 | EOG Resources, Inc. | Mooney #1HH | 5,500 | 22131088 |
| 613808Amendment | Feb 15, 2006 | Feb 15, 2006 | EOG Resources, Inc. | Mooney Unit #1HH | 5,500 | 22131088 |
| 613808Amendment | Feb 15, 2006 | Feb 15, 2006 | EOG Resources, Inc. | Mooney Unit #1HH | 5,500 | 22131088 |
| 613808Amendment | Feb 15, 2006 | Feb 15, 2006 | EOG Resources, Inc. | Branch Farms #1HH | 5,600 | 22131088 |
| 614180 | Feb 14, 2006 | Feb 14, 2006 | Quicksilver Resources Inc. | Speed Racer #2D | 6,300 | 22131090 |
| 614175 | Feb 14, 2006 | Feb 14, 2006 | Quicksilver Resources Inc. | Lucy Unit #2 | 6,200 | 22131089 |
| 613778 | Feb 7, 2006 | Feb 7, 2006 | Burlington Resources O & G Co LP | Wallace #1HH | 9,000 | 22131087 |
| 613589 | Feb 3, 2006 | Feb 3, 2006 | Peak Energy Operating #2, LLC | Wann #3HH | 5,500 | 22131086 |
| 613324 | Jan 31, 2006 | Jan 31, 2006 | Quicksilver Resources Inc. | Sugar Crisp Unit #1HH | 6,600 | 22131084 |
| 613320 | Jan 31, 2006 | Jan 31, 2006 | Quicksilver Resources Inc. | Sugar Crisp Unit #2HH | 6,600 | 22131085 |
| 612871 | Jan 31, 2006 | Jan 31, 2006 | Quicksilver Resources Inc. | Coyote Crossing Unit #1HH | 6,600 | 22131083 |
| 612673 | Jan 19, 2006 | Jan 19, 2006 | Majestic Consulting, LC | Acton SWD #1 | 10,000 | 22131082 |
| 612673Amendment | Jan 19, 2006 | Jan 19, 2006 | Wec, Inc. | Acton SWD #1 | 10,000 | 22131082 |
| 611848 | Jan 10, 2006 | Jan 10, 2006 | Burlington Resources O & G Co LP | Kidd #1HH | 9,000 | 22131080 |
| 611940 | Jan 6, 2006 | Jan 6, 2006 | Carrizo Oil & Gas, Inc. | Buzzard Hollow Ranch #2HH | 7,500 | 22131081 |
| 611847 | Jan 4, 2006 | Jan 4, 2006 | Burlington Resources O & G Co LP | Underwood #1HH | 9,000 | 22131079 |
| 611662 | Dec 28, 2005 | Dec 28, 2005 | Quicksilver Resources Inc. | Red Dragon Unit #2HH | 6,600 | 22131078 |
| 611657 | Dec 28, 2005 | Dec 28, 2005 | Quicksilver Resources Inc. | Red Dragon Unit #1HH | 6,600 | 22131077 |
| 611253 | Dec 28, 2005 | Dec 28, 2005 | Quicksilver Resources Inc. | Brown-Eyed Girl Unit #1HH | 6,600 | 22131076 |
| 610680 | Dec 8, 2005 | Dec 8, 2005 | Burlington Resources O & G Co LP | Behrens a Unit #2HH | 9,000 | 22131074 |
| 610654 | Dec 8, 2005 | Dec 8, 2005 | EOG Resources, Inc. | Dale Head Unit #1HH | 6,000 | 22131073 |
| 610273 | Nov 30, 2005 | Nov 30, 2005 | Peak Energy Operating #2, LLC | Cravens #8HH | 5,527 | 22131072 |
| 610273Amendment | Nov 30, 2005 | Nov 30, 2005 | XTO Energy Inc. | Cravens #8HH | 8,900 | 22131072 |
| 610066 | Nov 29, 2005 | Nov 29, 2005 | Encana Oil & Gas(usa) Inc. | Mills #5HH | 9,000 | 22131070 |
| 610065 | Nov 29, 2005 | Nov 29, 2005 | Encana Oil & Gas(usa) Inc. | Mills #3HH | 9,000 | 22131071 |
| 609907 | Nov 28, 2005 | Nov 28, 2005 | Peak Energy Operating #2, LLC | Nix #6HH | 5,543 | 22131069 |
| 609907Amendment | Nov 28, 2005 | Nov 28, 2005 | XTO Energy Inc. | Nix #6HH | 5,543 | 22131069 |
| 609816 | Nov 23, 2005 | Nov 23, 2005 | Encana Oil & Gas(usa) Inc. | Stank Unit #1HH | 9,000 | 22131068 |
| 609816Amendment | Nov 23, 2005 | Nov 23, 2005 | Encana Oil & Gas(usa) Inc. | Stank Unit #1HH | 9,000 | 22131068 |
| 609572 | Nov 16, 2005 | Nov 16, 2005 | Peak Energy Operating #2, LLC | Marshall-Loftin #6HH | 5,600 | 22131067 |
| 609335 | Nov 14, 2005 | Nov 14, 2005 | Peak Energy Operating #2, LLC | Nix #5HH | 5,563 | 22131066 |
| 609335Amendment | Nov 14, 2005 | Nov 14, 2005 | XTO Energy Inc. | Nix Unit #5HH | 8,900 | 22131066 |
| 609153 | Nov 9, 2005 | Nov 9, 2005 | Burlington Resources O & G Co LP | Bowser Ranch #2HH | 9,000 | 22131065 |
| 609122 | Nov 8, 2005 | Nov 8, 2005 | EOG Resources, Inc. | Big L Ranch #1HH | 9,300 | 22131064 |
| 608849 | Nov 4, 2005 | Nov 4, 2005 | Quicksilver Resources Inc. | Langdon Unit "A" #2 | 6,200 | 22131062 |
| 608764 | Nov 3, 2005 | Nov 3, 2005 | Quicksilver Resources Inc. | Langdon Unit "A" #1HH | 6,600 | 22131063 |
| 608468 | Oct 28, 2005 | Oct 28, 2005 | Peak Energy Operating #2, LLC | Bratten Ranch #13HH | 5,200 | 22131061 |
| 608345 | Oct 26, 2005 | Oct 26, 2005 | Peak Energy Operating #2, LLC | Bratten Ranch #12HH | 5,200 | 22131060 |
| 608202 | Oct 21, 2005 | Oct 21, 2005 | Encana Oil & Gas(usa) Inc. | Mills #4HH | 9,000 | 22131059 |
| 608093 | Oct 20, 2005 | Oct 20, 2005 | Quicksilver Resources Inc. | Lafrance Unit #1HH | 6,400 | 22131058 |
| 608092 | Oct 20, 2005 | Oct 20, 2005 | Quicksilver Resources Inc. | Lafrance Unit #2HH | 6,400 | 22131057 |
| 608091 | Oct 18, 2005 | Oct 18, 2005 | Burlington Resources O & G Co LP | Courts Cleveland B #2HH | 9,000 | 22131056 |
| 607838 | Oct 13, 2005 | Oct 13, 2005 | Carrizo Oil & Gas, Inc. | Robinson #1HH | 7,500 | 22131055 |
| 607659 | Oct 11, 2005 | Oct 11, 2005 | Peak Energy Operating #2, LLC | Peak SWD #1 | 8,500 | 22131054 |
| 607659Amendment | Oct 11, 2005 | Oct 11, 2005 | Peak Energy Operating #2, LLC | Peak SWD #1 | 9,500 | 22131054 |
| 607289 | Oct 6, 2005 | Oct 6, 2005 | Quicksilver Resources Inc. | Campos Unit "B" #1HH | 6,400 | 22131053 |
| 607289Amendment | Oct 6, 2005 | Oct 6, 2005 | Quicksilver Resources Inc. | Campos Unit "B" #1HH | 6,400 | 22131053 |
| 607286 | Oct 5, 2005 | Oct 5, 2005 | Quicksilver Resources Inc. | Campos Unit "B" #2HH | 6,400 | 22131052 |
| 607286Amendment | Oct 5, 2005 | Oct 5, 2005 | Quicksilver Resources Inc. | Campos Unit "B" #2HH | 6,400 | 22131052 |
| 606803 | Sep 27, 2005 | Sep 27, 2005 | Quicksilver Resources Inc. | Marshall, Sam #2 | 6,200 | 22131049 |
| 606761 | Sep 26, 2005 | Sep 26, 2005 | Quicksilver Resources Inc. | Pallmeyer Unit "B" #1HH | 6,400 | 22131051 |
| 606701 | Sep 23, 2005 | Sep 23, 2005 | Quicksilver Resources Inc. | Massey #2HH | 6,400 | 22131050 |
| 606725 | Sep 22, 2005 | Sep 22, 2005 | Majestic Consulting, LC | Majestic SWD I #1 | 9,000 | 22131048 |
| 606599 | Sep 21, 2005 | Sep 21, 2005 | Quicksilver Resources Inc. | Massey #1HH | 6,400 | 22131047 |
| 606584 | Sep 21, 2005 | Sep 21, 2005 | Quicksilver Resources Inc. | Hayworth #1HH | 6,400 | 22131046 |
| 606386 | Sep 16, 2005 | Sep 16, 2005 | Quicksilver Resources Inc. | Campos Unit "A" #1HH | 6,400 | 22131045 |
| 606383 | Sep 16, 2005 | Sep 16, 2005 | Quicksilver Resources Inc. | Campos Unit "A" #2HH | 6,400 | 22131044 |