| 624836Amendment | Sep 28, 2006 | Sep 28, 2006 | XTO Energy Inc. | Wann #4HH | 9,000 | 22131171 |
| 624836Amendment | Sep 28, 2006 | Sep 28, 2006 | XTO Energy Inc. | Wann #4HH | 9,000 | 22131171 |
| 626460 | Sep 25, 2006 | Sep 25, 2006 | Aspect Energy, LLC | Porter #2HH | 7,000 | 22131200 |
| 626451 | Sep 22, 2006 | Sep 22, 2006 | Aspect Energy, LLC | Porter #1HH | 7,000 | 22131199 |
| 626389 | Sep 22, 2006 | Sep 22, 2006 | Quicksilver Resources Inc. | San Raphael Unit #1HH | 6,400 | 22131198 |
| 626389Amendment | Sep 22, 2006 | Sep 22, 2006 | Quicksilver Resources Inc. | San Raphael Unit #1HH | 6,400 | 22131198 |
| 626389Amendment | Sep 22, 2006 | Sep 22, 2006 | Quicksilver Resources Inc. | San Raphael Unit #1HH | 6,400 | 22131198 |
| 626158 | Sep 22, 2006 | Sep 22, 2006 | Republic Energy Inc. | Alberthal #1HH | 8,900 | 22131189 |
| 626368 | Sep 21, 2006 | Sep 21, 2006 | XTO Energy Inc. | Marshall Loftin #7HH | 8,500 | 22131197 |
| 626368Amendment | Sep 21, 2006 | Sep 21, 2006 | XTO Energy Inc. | Marshall-Loftin #7HH | 8,500 | 22131197 |
| 626238 | Sep 21, 2006 | Sep 21, 2006 | Quicksilver Resources Inc. | Vette #4HH | 6,400 | 22131191 |
| 626261 | Sep 20, 2006 | Sep 20, 2006 | Star of Texas Energy Srvs, Inc. | Robertson Unit #1HH | 8,000 | 22131196 |
| 626240 | Sep 20, 2006 | Sep 20, 2006 | Quicksilver Resources Inc. | Vette #5HH | 6,400 | 22131193 |
| 626236 | Sep 20, 2006 | Sep 20, 2006 | Quicksilver Resources Inc. | Vette #3HH | 6,400 | 22131194 |
| 626235 | Sep 20, 2006 | Sep 20, 2006 | Quicksilver Resources Inc. | Possum Holler Unit #4HH | 6,400 | 22131192 |
| 626234 | Sep 20, 2006 | Sep 20, 2006 | Quicksilver Resources Inc. | Possum Holler Unit #3HH | 6,400 | 22131190 |
| 626089 | Sep 18, 2006 | Sep 18, 2006 | Burlington Resources O & G Co LP | Kidd Unit #5HH | 9,000 | 22131188 |
| 626089Amendment | Sep 18, 2006 | Sep 18, 2006 | Burlington Resources O & G Co LP | Kidd C Unit #5HH | 9,000 | 22131188 |
| 626089Amendment | Sep 18, 2006 | Sep 18, 2006 | Burlington Resources O & G Co LP | Kidd C Unit #5HH | 9,000 | 22131188 |
| 625986 | Sep 15, 2006 | Sep 15, 2006 | Quicksilver Resources Inc. | Possum Holler Unit #2HH | 6,400 | 22131187 |
| 625816 | Sep 13, 2006 | Sep 13, 2006 | Devon Energy Production Co, L.P. | Graham, Billy #1HH | 9,000 | 22131186 |
| 625797 | Sep 12, 2006 | Sep 12, 2006 | Quicksilver Resources Inc. | Boy Scout #2HH | 6,400 | 22131185 |
| 625796 | Sep 12, 2006 | Sep 12, 2006 | Quicksilver Resources Inc. | Boy Scout #1HH | 6,400 | 22131184 |
| 625389 | Sep 8, 2006 | Sep 8, 2006 | Encana Oil & Gas(usa) Inc. | Broyles #2HH | 9,000 | 22131181 |
| 625389Amendment | Sep 8, 2006 | Sep 8, 2006 | Encana Oil & Gas(usa) Inc. | Broyles #2HH | 9,000 | 22131181 |
| 625388 | Sep 8, 2006 | Sep 8, 2006 | Encana Oil & Gas(usa) Inc. | Broyles #1HH | 9,000 | 22131180 |
| 625556 | Sep 7, 2006 | Sep 7, 2006 | Carrizo Oil & Gas, Inc. | Buzzard Hollow Ranch #3HH | 7,500 | 22131183 |
| 625556Amendment | Sep 7, 2006 | Sep 7, 2006 | Carrizo Oil & Gas, Inc. | Buzzard Hollow Ranch #3HH | 7,500 | 22131183 |
| 625423 | Sep 7, 2006 | Sep 7, 2006 | Quicksilver Resources Inc. | Parker Unit #3HH | 6,400 | 22131182 |
| 625360 | Sep 1, 2006 | Sep 1, 2006 | Burlington Resources O & G Co LP | Hayworth Unit #2HH | 9,000 | 22131179 |
| 625189 | Aug 31, 2006 | Aug 31, 2006 | Quicksilver Resources Inc. | Possum Holler #1HH | 6,400 | 22131177 |
| 625189Amendment | Aug 31, 2006 | Aug 31, 2006 | Quicksilver Resources Inc. | Possum Holler Unit #1HH | 6,400 | 22131177 |
| 625193 | Aug 30, 2006 | Aug 30, 2006 | Quicksilver Resources Inc. | Haywire #2 | 6,200 | 22131178 |
| 625172 | Aug 29, 2006 | Aug 29, 2006 | Quicksilver Resources Inc. | El Camino Unit #1HH | 6,400 | 22131176 |
| 625070 | Aug 28, 2006 | Aug 28, 2006 | XTO Energy Inc. | Lokey #A 1HH | 10,000 | 22131175 |
| 625070Amendment | Aug 28, 2006 | Aug 28, 2006 | XTO Energy Inc. | Lokey #A 1HH | 10,000 | 22131175 |
| 625070Amendment | Aug 28, 2006 | Aug 28, 2006 | XTO Energy Inc. | Lokey #A 1HH | 10,000 | 22131175 |
| 625035 | Aug 28, 2006 | Aug 28, 2006 | Arrington,david H. Oil & Gas,inc | Cutwing Parachute Blue Damsel #1HH | 7,500 | 22131174 |
| 625005 | Aug 28, 2006 | Aug 28, 2006 | Arrington,david H. Oil & Gas,inc | T.R. McCasland SWD #1 | 8,500 | 22131173 |
| 624868 | Aug 25, 2006 | Aug 25, 2006 | Encana Oil & Gas(usa) Inc. | Cauble #2HH | 9,000 | 22131172 |
| 624868Amendment | Aug 25, 2006 | Aug 25, 2006 | Quicksilver Resources Inc. | Cauble #2HH | 9,000 | 22131172 |
| 624787 | Aug 23, 2006 | Aug 23, 2006 | Quicksilver Resources Inc. | Mabel Roe Unit #2HH | 6,400 | 22131170 |
| 624783 | Aug 23, 2006 | Aug 23, 2006 | Quicksilver Resources Inc. | Mabel Roe Unit #1HH | 6,400 | 22131169 |
| 624759 | Aug 22, 2006 | Aug 22, 2006 | Big State Industries, Inc. | Gay #1 | 9,000 | 22131168 |
| 624658 | Aug 21, 2006 | Aug 21, 2006 | Burlington Resources O & G Co LP | C-C Unit #1HH | 9,000 | 22131167 |
| 624243 | Aug 18, 2006 | Aug 18, 2006 | Quicksilver Resources Inc. | S.S. Minnow Unit #1HH | 6,400 | 22131165 |
| 624243Amendment | Aug 18, 2006 | Aug 18, 2006 | Quicksilver Resources Inc. | S. S. Minnow Unit #1HH | 6,400 | 22131165 |
| 624328 | Aug 15, 2006 | Aug 15, 2006 | Arrington,david H. Oil & Gas,inc | Cutwing Parachute Adams #1HH | 7,000 | 22131166 |
| 624170 | Aug 10, 2006 | Aug 10, 2006 | Quicksilver Resources Inc. | Monte Carlo #2HH | 6,400 | 22131164 |
| 624103 | Aug 9, 2006 | Aug 9, 2006 | Quicksilver Resources Inc. | Marshall, Sam A #2 | 6,200 | 22131163 |
| 623693 | Aug 8, 2006 | Aug 8, 2006 | Encana Oil & Gas(usa) Inc. | Burns-Worrell Unit #3HH | 9,000 | 22131161 |
| 623688 | Aug 8, 2006 | Aug 8, 2006 | Encana Oil & Gas(usa) Inc. | Burns-Worrell Unit #2HH | 9,000 | 22131162 |
| 623685 | Aug 8, 2006 | Aug 8, 2006 | Encana Oil & Gas(usa) Inc. | Burns-Worrell Unit #1HH | 9,000 | 22131160 |
| 623839 | Aug 4, 2006 | Aug 4, 2006 | Chesapeake Operating, Inc. | Little Hoss #V 3HH | 9,000 | 22131159 |
| 623838 | Aug 4, 2006 | Aug 4, 2006 | Chesapeake Operating, Inc. | Little Hoss #V 2HH | 9,000 | 22131158 |
| 623837 | Aug 4, 2006 | Aug 4, 2006 | Chesapeake Operating, Inc. | Little Hoss #V 1HH | 12,000 | 22131157 |
| 623836 | Aug 4, 2006 | Aug 4, 2006 | Aspect Energy, LLC | Blaylock #1H | 6,800 | 22131156 |
| 623836Amendment | Aug 4, 2006 | Aug 4, 2006 | Aspect Energy, LLC | Blaylock #1HH | 6,800 | 22131156 |
| 623776 | Aug 3, 2006 | Aug 3, 2006 | Quicksilver Resources Inc. | Thurston Unit #3HH | 6,400 | 22131155 |
| 623771 | Aug 3, 2006 | Aug 3, 2006 | Quicksilver Resources Inc. | Thurston Unit #2HH | 6,400 | 22131154 |
| 623204 | Jul 26, 2006 | Jul 26, 2006 | Quicksilver Resources Inc. | Smelley #2 | 6,200 | 22131153 |
| 622835 | Jul 26, 2006 | Jul 26, 2006 | EOG Resources, Inc. | Black Ranch #7HH | 5,500 | 22131151 |
| 622835Amendment | Jul 26, 2006 | Jul 26, 2006 | EOG Resources, Inc. | Black Ranch #7HH | 5,500 | 22131151 |
| 623059 | Jul 24, 2006 | Jul 24, 2006 | EOG Resources, Inc. | Welborn-Simon #1HH | 5,900 | 22131152 |
| 622825 | Jul 19, 2006 | Jul 19, 2006 | Arrington,david H. Oil & Gas,inc | Cutwing Parachute Emerger #1HH | 7,200 | 22131150 |
| 622627 | Jul 14, 2006 | Jul 14, 2006 | Quicksilver Resources Inc. | Sunnye Unit #2HH | 6,400 | 22131149 |
| 622625 | Jul 14, 2006 | Jul 14, 2006 | Quicksilver Resources Inc. | Sunnye Unit #1HH | 6,400 | 22131148 |
| 622131 | Jul 12, 2006 | Jul 12, 2006 | Quicksilver Resources Inc. | Monte Carlo #1HH | 6,400 | 22131146 |
| 622130 | Jul 12, 2006 | Jul 12, 2006 | Quicksilver Resources Inc. | Smelley B #1HH | 6,400 | 22131145 |
| 622130Amendment | Jul 12, 2006 | Jul 12, 2006 | Quicksilver Resources Inc. | Smelley B #1HH | 6,400 | 22131145 |
| 622286 | Jul 11, 2006 | Jul 11, 2006 | Burlington Resources O & G Co LP | Comanche Peak #7HH | 9,000 | 22131147 |
| 622189 | Jul 10, 2006 | Jul 10, 2006 | Burlington Resources O & G Co LP | Kidd Unit #4HH | 9,000 | 22131144 |
| 622063 | Jul 6, 2006 | Jul 6, 2006 | Burlington Resources O & G Co LP | Comanche Peak #5HH | 9,000 | 22131143 |
| 621880 | Jul 3, 2006 | Jul 3, 2006 | Quicksilver Resources Inc. | Thurston Unit #1HH | 6,400 | 22131142 |
| 621880Amendment | Jul 3, 2006 | Jul 3, 2006 | Quicksilver Resources Inc. | Thurston Unit #1HH | 6,400 | 22131142 |
| 621910 | Jun 30, 2006 | Jun 30, 2006 | Willowbend Investments, Inc. | Triad-Cooper #1HH | 6,000 | 22131141 |
| 621781 | Jun 29, 2006 | Jun 29, 2006 | Burlington Resources O & G Co LP | Comanche Peak #6HH | 9,000 | 22131140 |
| 621714 | Jun 28, 2006 | Jun 28, 2006 | Bandera Exploration Company | Horseshoe #2 | 9,510 | 22131139 |
| 621704 | Jun 28, 2006 | Jun 28, 2006 | Range Production Company | Mitchell Ranch #4HH | 7,000 | 22131138 |
| 621704Amendment | Jun 28, 2006 | Jun 28, 2006 | Range Production Company | Mitchell Ranch-Betty Lou #4HH | 7,000 | 22131138 |
| 621703 | Jun 28, 2006 | Jun 28, 2006 | Range Production Company | Mitchell Ranch #3HH | 7,000 | 22131137 |
| 621703Amendment | Jun 28, 2006 | Jun 28, 2006 | Range Production Company | Mitchell Ranch #3HH | 9,000 | 22131137 |
| 621654 | Jun 28, 2006 | Jun 28, 2006 | Range Production Company | Mitchell Ranch #6HH | 7,000 | 22131135 |
| 621653 | Jun 27, 2006 | Jun 27, 2006 | Range Production Company | Mitchell Ranch #5HH | 7,000 | 22131136 |
| 621559 | Jun 26, 2006 | Jun 26, 2006 | Chief Oil & Gas LLC ** | Nance, Kathy #1HH | 8,900 | 22131134 |
| 621492 | Jun 23, 2006 | Jun 23, 2006 | Burlington Resources O & G Co LP | Evans #1HH | 9,000 | 22131133 |
| 621492Amendment | Jun 23, 2006 | Jun 23, 2006 | Burlington Resources O & G Co LP | Evans #1HH | 9,000 | 22131133 |
| 621408 | Jun 22, 2006 | Jun 22, 2006 | Arrington,david H. Oil & Gas,inc | Cutwing Parachute Caddis #1HH | 7,200 | 22131132 |
| 621258 | Jun 21, 2006 | Jun 21, 2006 | Burlington Resources O & G Co LP | Hayworth #1HH | 9,000 | 22131129 |
| 621258Amendment | Jun 21, 2006 | Jun 21, 2006 | Burlington Resources O & G Co LP | Hayworth #1HH | 9,000 | 22131129 |
| 621156 | Jun 21, 2006 | Jun 21, 2006 | Range Production Company | Mitchell Ranch #2HH | 9,850 | 22131131 |
| 621271 | Jun 20, 2006 | Jun 20, 2006 | Burlington Resources O & G Co LP | Kidd Unit #3HH | 9,000 | 22131130 |
| 621271Amendment | Jun 20, 2006 | Jun 20, 2006 | Burlington Resources O & G Co LP | Kidd a Unit #3HH | 9,000 | 22131130 |
| 621271Amendment | Jun 20, 2006 | Jun 20, 2006 | Burlington Resources O & G Co LP | Kidd a Unit #3HH | 9,000 | 22131130 |
| 621095 | Jun 20, 2006 | Jun 20, 2006 | EOG Resources, Inc. | Black Ranch #8HH | 5,400 | 22131127 |
| 621241 | Jun 19, 2006 | Jun 19, 2006 | Arrington,david H. Oil & Gas,inc | Praying Mantis #1HH | 6,500 | 22131128 |
| 620946 | Jun 19, 2006 | Jun 19, 2006 | Encana Oil & Gas(usa) Inc. | Massey, Kenneth #3HH | 9,000 | 22131126 |
| 620944 | Jun 19, 2006 | Jun 19, 2006 | Encana Oil & Gas(usa) Inc. | Massey, Kenneth #2HH | 9,000 | 22131125 |
| 620714 | Jun 15, 2006 | Jun 15, 2006 | EOG Resources, Inc. | Callaway Unit #2HH | 7,000 | 22131124 |
| 620714Amendment | Jun 15, 2006 | Jun 15, 2006 | EOG Resources, Inc. | Callaway Unit #2HH | 10,000 | 22131124 |