All 9 drilling companies that have filed a well log in Petroleum County in the last ten years, 5 of them in the last five, ranked by recent work.
| Company | Last 5 yrs | Last 10 yrs | All time | Latest | First on file |
|---|---|---|---|---|---|
| Central Drilling Inc | 5 | 11 | 19 | 2025 | 2000 |
| Hole World Consulting Llc | 4 | 5 | 5 | 2023 | 2018 |
| Vidic Drilling Inc | 2 | 4 | 5 | 2022 | 2004 |
| Singley Drilling | 1 | 2 | 83 | 2021 | 1918 |
| Higgins Drilling Company | 1 | 1 | 1 | 2024 | 2024 |
| Haz Tech Drilling Inc | 0 | 4 | 4 | 2020 | 2019 |
| Gordon Drilling Inc | 0 | 4 | 43 | 2017 | 1992 |
| Bertram Drilling Inc | 0 | 1 | 1 | 2020 | 2020 |
| Aquasource Drilling Llc | 0 | 1 | 1 | 2020 | 2020 |
Source: MBMG Ground Water Information Center well logs. A count of public records, not a recommendation. How to check a driller. Depth and yield for Petroleum County: Montana Water Report.
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