Sheridan County has 1,100 wells in the MBOGC well file — 87 of them producing today (87 oil, 0 gas), 4 permitted, 0 spudded but not yet completed, and 750 plugged and abandoned. The most active operator by well count is D90 Energy, LLC. Figures come from the 2026-09-29 MBOGC bulk file; production runs through 2026-08.
| Operator | Wells |
|---|---|
| D90 Energy, LLC | 145 |
| Northern Oil Production, INC. | 56 |
| Wy Basin Operating LLC | 54 |
| Signal Drilling & Expl. Co. INC. | 35 |
| Granite Creek Energy LLC | 29 |
| Chevron U.s.a. INC.(A Pennsylvania Corp.) | 26 |
| Rim Operating, INC. | 26 |
| Sun Exploration And Production Co | 20 |
| Amerada Hess Corporation | 19 |
| Taqa North Usa, INC. | 15 |
| Field | Wells |
|---|---|
| Flat Lake | 165 |
| Goose Lake | 60 |
| Dwyer | 53 |
| Divide | 26 |
| Outlook | 25 |
| Raymond | 24 |
| Wildcat Sheridan | 20 |
| Clear Lake | 17 |