Musselshell County has 1,385 wells in the MBOGC well file — 28 of them producing today (28 oil, 0 gas), 3 permitted, 0 spudded but not yet completed, and 1,236 plugged and abandoned. The most active operator by well count is True Oil LLC. Figures come from the 2026-09-29 MBOGC bulk file; production runs through 2026-08.
| Operator | Wells |
|---|---|
| True Oil LLC | 81 |
| Beartooth Oil & Gas Company | 76 |
| Mcalester Fuel Co | 66 |
| Texaco Exploration And Production INC. | 49 |
| Amerada Hess Corporation | 34 |
| Conoco INC. | 29 |
| Cline Production Company | 27 |
| Cardinal Petroleum | 26 |
| Exeter Exploration Company | 26 |
| Aberdeen Resources Corp | 25 |
| Field | Wells |
|---|---|
| Big Wall | 55 |
| Devil's Basin | 49 |
| Keg Coulee | 41 |
| Little Wall Creek, South | 26 |
| Jim Coulee | 25 |
| Ivanhoe | 24 |
| Mason Lake | 24 |
| Ragged Point | 24 |