| 632858Amendment | Feb 5, 2007 | Feb 5, 2007 | Quicksilver Resources Inc. | Bubbs Unit #3HH | 6,400 | 22131277 |
| 632851 | Feb 5, 2007 | Feb 5, 2007 | Quicksilver Resources Inc. | Bubbs Unit #2HH | 6,400 | 22131276 |
| 632851Amendment | Feb 5, 2007 | Feb 5, 2007 | Quicksilver Resources Inc. | Bubbs Unit #2HH | 6,053 | 22131276 |
| 632849 | Feb 5, 2007 | Feb 5, 2007 | Quicksilver Resources Inc. | Bubbs Unit #1HH | 6,400 | 22131275 |
| 632697 | Feb 2, 2007 | Feb 2, 2007 | Carrizo Oil & Gas, Inc. | Tomlinson #2HH | 7,500 | 22131274 |
| 632631 | Jan 30, 2007 | Jan 30, 2007 | Quicksilver Resources Inc. | Wellman Unit #3HH | 6,400 | 22131273 |
| 632630 | Jan 30, 2007 | Jan 30, 2007 | Quicksilver Resources Inc. | Wellman Unit #2HH | 6,400 | 22131272 |
| 632417 | Jan 26, 2007 | Jan 26, 2007 | Quicksilver Resources Inc. | Pallmeyer A #2HH | 6,400 | 22131271 |
| 632062 | Jan 22, 2007 | Jan 22, 2007 | XTO Energy Inc. | Black Ranch North B #E 1HH | 10,000 | 22131269 |
| 631912 | Jan 22, 2007 | Jan 22, 2007 | EOG Resources, Inc. | Mabery "a" Unit #1HH | 5,700 | 22131267 |
| 631979 | Jan 19, 2007 | Jan 19, 2007 | Quicksilver Resources Inc. | Wellman Unit #1HH | 6,400 | 22131268 |
| 631859 | Jan 18, 2007 | Jan 18, 2007 | Devon Energy Production Co, L.P. | Pepper GU #1HH | 9,000 | 22131266 |
| 631835 | Jan 18, 2007 | Jan 18, 2007 | Chief Operating LLC | Crockett-Calhoun #1HH | 8,900 | 22131265 |
| 631834 | Jan 18, 2007 | Jan 18, 2007 | Chief Operating LLC | Crockett-Calhoun #2HH | 8,900 | 22131264 |
| 630750 | Jan 18, 2007 | Jan 18, 2007 | Devon Energy Production Co, L.P. | Wakefield, Sandra #1HH | 9,000 | 22131259 |
| 630750Amendment | Jan 18, 2007 | Jan 18, 2007 | Devon Energy Production Co, L.P. | Wakefield, Sandra #1HH | 9,000 | 22131259 |
| 631034 | Dec 27, 2006 | Dec 27, 2006 | EOG Resources, Inc. | Mabery "B" Unit #1HH | 5,700 | 22131263 |
| 631034Amendment | Dec 27, 2006 | Dec 27, 2006 | EOG Resources, Inc. | Mabery "B" Unit #1HH | 5,700 | 22131263 |
| 630989 | Dec 27, 2006 | Dec 27, 2006 | Devon Energy Production Co, L.P. | Bills Gas Unit #1HH | 9,000 | 22131262 |
| 630875 | Dec 21, 2006 | Dec 21, 2006 | Quicksilver Resources Inc. | Langdon #4HH | 6,400 | 22131261 |
| 630874 | Dec 21, 2006 | Dec 21, 2006 | Quicksilver Resources Inc. | Langdon #3HH | 6,400 | 22131260 |
| 630795 | Dec 20, 2006 | Dec 20, 2006 | Burlington Resources O & G Co LP | Triple Creek B Unit #1HH | 9,000 | 22131258 |
| 630795Amendment | Dec 20, 2006 | Dec 20, 2006 | Burlington Resources O & G Co LP | Triple Creek B Unit #1HH | 9,000 | 22131258 |
| 630629 | Dec 20, 2006 | Dec 20, 2006 | Burlington Resources O & G Co LP | Triple Creek #1HH | 9,000 | 22131249 |
| 630629Amendment | Dec 20, 2006 | Dec 20, 2006 | Burlington Resources O & G Co LP | Triple Creek #1HH | 9,000 | 22131249 |
| 630682 | Dec 19, 2006 | Dec 19, 2006 | Quicksilver Resources Inc. | Skipper Unit #5HH | 6,600 | 22131257 |
| 630679 | Dec 19, 2006 | Dec 19, 2006 | Quicksilver Resources Inc. | Skipper Unit #4HH | 6,400 | 22131256 |
| 630673 | Dec 18, 2006 | Dec 18, 2006 | Quicksilver Resources Inc. | Skipper Unit #3HH | 6,400 | 22131255 |
| 630655 | Dec 18, 2006 | Dec 18, 2006 | Quicksilver Resources Inc. | Randle #6HH | 6,400 | 22131254 |
| 630653 | Dec 18, 2006 | Dec 18, 2006 | Quicksilver Resources Inc. | Randle #5HH | 6,400 | 22131253 |
| 630652 | Dec 18, 2006 | Dec 18, 2006 | Quicksilver Resources Inc. | Randle #4HH | 6,400 | 22131252 |
| 630648 | Dec 18, 2006 | Dec 18, 2006 | Quicksilver Resources Inc. | Randle #3HH | 6,400 | 22131251 |
| 630648Amendment | Dec 18, 2006 | Dec 18, 2006 | Quicksilver Resources Inc. | Randle #3HH | 6,400 | 22131251 |
| 630646 | Dec 18, 2006 | Dec 18, 2006 | Quicksilver Resources Inc. | Randle #2HH | 6,400 | 22131250 |
| 630646Amendment | Dec 18, 2006 | Dec 18, 2006 | Quicksilver Resources Inc. | Randle #2HH | 6,400 | 22131250 |
| 630622 | Dec 15, 2006 | Dec 15, 2006 | Quicksilver Resources Inc. | Randle #1HH | 6,400 | 22131248 |
| 630622Amendment | Dec 15, 2006 | Dec 15, 2006 | Quicksilver Resources Inc. | Randle #1HH | 6,400 | 22131248 |
| 630607 | Dec 15, 2006 | Dec 15, 2006 | Pinnergy, Ltd. | Parker #1D | 10,000 | 22131109 |
| 630588 | Dec 15, 2006 | Dec 15, 2006 | Chesapeake Operating, Inc. | Little Hoss #P 3HH | 9,000 | 22131247 |
| 630588Amendment | Dec 15, 2006 | Dec 15, 2006 | Chesapeake Operating, Inc. | Little Hoss #P 3HH | 9,000 | 22131247 |
| 630587 | Dec 15, 2006 | Dec 15, 2006 | Chesapeake Operating, Inc. | Little Hoss #P 2HH | 9,000 | 22131246 |
| 630587Amendment | Dec 15, 2006 | Dec 15, 2006 | Chesapeake Operating, Inc. | Little Hoss #P 2HH | 9,000 | 22131246 |
| 630586 | Dec 15, 2006 | Dec 15, 2006 | Chesapeake Operating, Inc. | Little Hoss #P 1HH | 9,000 | 22131245 |
| 630586Amendment | Dec 15, 2006 | Dec 15, 2006 | Chesapeake Operating, Inc. | Little Hoss #P 1HH | 9,000 | 22131245 |
| 630584 | Dec 15, 2006 | Dec 15, 2006 | Quicksilver Resources Inc. | Skipper Unit #1HH | 6,400 | 22131244 |
| 630362 | Dec 12, 2006 | Dec 12, 2006 | XTO Energy Inc. | Black Ranch North A #D 1HH | 11,000 | 22131243 |
| 630358 | Dec 12, 2006 | Dec 12, 2006 | XTO Energy Inc. | Black Ranch North B #C 1HH | 11,000 | 22131242 |
| 630358Amendment | Dec 12, 2006 | Dec 12, 2006 | XTO Energy Inc. | Black Ranch North B #C 1HH | 10,000 | 22131242 |
| 630268 | Dec 11, 2006 | Dec 11, 2006 | XTO Energy Inc. | Bratten Ranch #14HH | 11,000 | 22131241 |
| 630268Amendment | Dec 11, 2006 | Dec 11, 2006 | XTO Energy Inc. | Bratten Ranch #14HH | 11,000 | 22131241 |
| 630050 | Dec 6, 2006 | Dec 6, 2006 | Quicksilver Resources Inc. | Bob Denver Unit #4HH | 6,400 | 22131239 |
| 630046 | Dec 6, 2006 | Dec 6, 2006 | Quicksilver Resources Inc. | Bob Denver Unit #3HH | 6,400 | 22131240 |
| 630020 | Dec 6, 2006 | Dec 6, 2006 | EOG Resources, Inc. | Black Ranch #15HH | 5,700 | 22131238 |
| 629867 | Dec 1, 2006 | Dec 1, 2006 | Quicksilver Resources Inc. | Hinton #3HH | 6,400 | 22131237 |
| 629865 | Dec 1, 2006 | Dec 1, 2006 | Quicksilver Resources Inc. | Hinton #2HH | 6,400 | 22131236 |
| 629476 | Nov 27, 2006 | Nov 27, 2006 | EOG Resources, Inc. | Black Ranch #14HH | 5,500 | 22131235 |
| 629363 | Nov 21, 2006 | Nov 21, 2006 | Quicksilver Resources Inc. | Skipper Unit #2HH | 6,600 | 22131234 |
| 629363Amendment | Nov 21, 2006 | Nov 21, 2006 | Quicksilver Resources Inc. | Skipper Unit #2HH | 6,600 | 22131234 |
| 629172 | Nov 17, 2006 | Nov 17, 2006 | Devon Energy Production Co, L.P. | Seymour East #1HH | 9,000 | 22131233 |
| 628775 | Nov 9, 2006 | Nov 9, 2006 | EOG Resources, Inc. | Black Ranch #11HH | 5,700 | 22131231 |
| 628549 | Nov 6, 2006 | Nov 6, 2006 | Quicksilver Resources Inc. | Bob Denver Unit #6HH | 6,600 | 22131230 |
| 628548 | Nov 6, 2006 | Nov 6, 2006 | Quicksilver Resources Inc. | Bob Denver Unit #5HH | 6,600 | 22131229 |
| 628519 | Nov 3, 2006 | Nov 3, 2006 | Quicksilver Resources Inc. | Bob Denver Unit #7HH | 6,600 | 22131228 |
| 628515 | Nov 3, 2006 | Nov 3, 2006 | Devon Energy Production Co, L.P. | Thompson, Ada #1HH | 9,000 | 22131227 |
| 628246 | Oct 30, 2006 | Oct 30, 2006 | Chief Operating LLC | Everidge Unit #1HH | 8,900 | 22131226 |
| 628221 | Oct 30, 2006 | Oct 30, 2006 | Quicksilver Resources Inc. | Gilligan Unit #5HH | 6,600 | 22131225 |
| 628220 | Oct 27, 2006 | Oct 27, 2006 | Quicksilver Resources Inc. | Gilligan Unit #4HH | 6,600 | 22131223 |
| 628218 | Oct 27, 2006 | Oct 27, 2006 | Quicksilver Resources Inc. | Gilligan Unit #3HH | 6,600 | 22131224 |
| 628216 | Oct 27, 2006 | Oct 27, 2006 | Quicksilver Resources Inc. | Gilligan Unit #2HH | 6,600 | 22131222 |
| 628033 | Oct 25, 2006 | Oct 25, 2006 | Devon Energy Production Co, L.P. | Thormann GU #1 | 9,000 | 22131221 |
| 628027 | Oct 25, 2006 | Oct 25, 2006 | Burlington Resources O & G Co LP | Blanche-Emily #1HH | 9,000 | 22131220 |
| 627713 | Oct 18, 2006 | Oct 18, 2006 | EOG Resources, Inc. | Welborn-Simon #2HH | 6,000 | 22131218 |
| 627713Amendment | Oct 18, 2006 | Oct 18, 2006 | EOG Resources, Inc. | Welborn-Simon #2HH | 6,000 | 22131218 |
| 627643 | Oct 18, 2006 | Oct 18, 2006 | Burlington Resources O & G Co LP | Randle #1HH | 9,000 | 22131219 |
| 627643Amendment | Oct 18, 2006 | Oct 18, 2006 | Burlington Resources O & G Co LP | Randle #1HH | 9,000 | 22131219 |
| 627517 | Oct 16, 2006 | Oct 16, 2006 | Quicksilver Resources Inc. | Pallmeyer East #1HH | 6,400 | 22131217 |
| 627437 | Oct 13, 2006 | Oct 13, 2006 | Devon Energy Production Co, L.P. | Nona Williams #1HH | 9,000 | 22131216 |
| 627422 | Oct 12, 2006 | Oct 12, 2006 | Quicksilver Resources Inc. | San Raphael Unit #4HH | 6,400 | 22131215 |
| 627422Amendment | Oct 12, 2006 | Oct 12, 2006 | Quicksilver Resources Inc. | San Raphael Unit #4HH | 6,400 | 22131215 |
| 627421 | Oct 12, 2006 | Oct 12, 2006 | Quicksilver Resources Inc. | San Raphael Unit #3HH | 6,400 | 22131214 |
| 627421Amendment | Oct 12, 2006 | Oct 12, 2006 | Quicksilver Resources Inc. | San Raphael Unit #3HH | 6,400 | 22131214 |
| 627419 | Oct 12, 2006 | Oct 12, 2006 | Quicksilver Resources Inc. | Parker Unit #6HH | 6,400 | 22131213 |
| 627417 | Oct 12, 2006 | Oct 12, 2006 | Quicksilver Resources Inc. | Parker Unit #5HH | 6,400 | 22131212 |
| 627416 | Oct 12, 2006 | Oct 12, 2006 | Quicksilver Resources Inc. | Parker Unit #4HH | 6,400 | 22131211 |
| 627156 | Oct 11, 2006 | Oct 11, 2006 | Star of Texas Energy Srvs, Inc. | Durant #1HH | 8,000 | 22131209 |
| 627229 | Oct 10, 2006 | Oct 10, 2006 | Arrington,david H. Oil & Gas,inc | Cutwing Parachute Emerger #2HH | 7,200 | 22131210 |
| 627087 | Oct 5, 2006 | Oct 5, 2006 | Quicksilver Resources Inc. | Cauble #1HH | 6,400 | 22131208 |
| 626942 | Oct 3, 2006 | Oct 3, 2006 | Bandera Exploration Company | Horseshoe #1 | 9,510 | 22131206 |
| 626907 | Oct 3, 2006 | Oct 3, 2006 | Quicksilver Resources Inc. | San Raphael Unit #2HH | 6,400 | 22131205 |
| 626907Amendment | Oct 3, 2006 | Oct 3, 2006 | Quicksilver Resources Inc. | San Raphael Unit #2HH | 6,400 | 22131205 |
| 626905 | Oct 3, 2006 | Oct 3, 2006 | Quicksilver Resources Inc. | Boy Scout #5HH | 6,400 | 22131204 |
| 626905Amendment | Oct 3, 2006 | Oct 3, 2006 | Quicksilver Resources Inc. | Boy Scout #5HH | 6,400 | 22131204 |
| 626887 | Oct 3, 2006 | Oct 3, 2006 | Quicksilver Resources Inc. | Boy Scout #4HH | 6,400 | 22131203 |
| 626887Amendment | Oct 3, 2006 | Oct 3, 2006 | Quicksilver Resources Inc. | Boy Scout #4HH | 6,400 | 22131203 |
| 626741 | Oct 3, 2006 | Oct 3, 2006 | Quicksilver Resources Inc. | Boy Scout #3HH | 6,400 | 22131207 |
| 626741Amendment | Oct 3, 2006 | Oct 3, 2006 | Quicksilver Resources Inc. | Boy Scout #3HH | 6,400 | 22131207 |
| 626242 | Oct 3, 2006 | Oct 3, 2006 | Quicksilver Resources Inc. | Vette #6 | 6,200 | 22131195 |
| 626853 | Oct 2, 2006 | Oct 2, 2006 | Burlington Resources O & G Co LP | Kidd D Unit #6HH | 9,000 | 22131202 |
| 626696 | Sep 28, 2006 | Sep 28, 2006 | Arrington,david H. Oil & Gas,inc | Baker Street #1HH | 7,500 | 22131201 |
| 624836 | Sep 28, 2006 | Sep 28, 2006 | XTO Energy Inc. | Wann #4HH | 9,000 | 22131171 |