Petroleum County has 706 wells in the MBOGC well file — 43 of them producing today (43 oil, 0 gas), 1 permitted, 0 spudded but not yet completed, and 616 plugged and abandoned. The most active operator by well count is Cenex, INC.. Figures come from the 2026-09-29 MBOGC bulk file; production runs through 2026-08.
| Operator | Wells |
|---|---|
| Cenex, INC. | 78 |
| Cat Creek Holdings LLC | 56 |
| Continental Oil Company | 33 |
| Conoco INC. | 25 |
| Mid-Northern Oil Co. | 21 |
| Taylor, Ike | 15 |
| Frantz Corporation | 15 |
| Carnell, Millicent C. | 12 |
| Minnesota Flatwillow Petroleum Corp. | 12 |
| Central Montana Resources, LLC | 12 |
| Field | Wells |
|---|---|
| Cat Creek | 292 |
| Rattlesnake Butte | 15 |
| Wildcat Petroleum | 7 |
| Rattle Snake Butte (Heath) | 7 |
| Brush Creek | 2 |
| Yellow Water (Heath) | 2 |
| Kootenai | 1 |
| Mcdonald Creek | 1 |