Cardinal Petroleum
Operator of record for 546 catalogued wells across 7 states. Every well below links to its full registry page.
Filed as: CARDINAL PETROLEUM CO · CARDINAL PETROLEUM CO. · CARDINAL PETROLEUM COMPANY · CARDINAL PETROLEUM CORP · …
At a glance
Cardinal Petroleum is the operator of record for 546 catalogued U.S. oil & gas wells in 7 states. 1 (0.2%) are active, 532 (97%) plugged & abandoned. Its largest concentration is in Montana, with 271 wells (50% of its portfolio).
Wells operated
546
Active
1
Plugged
532
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| Montana | 271 |
| North Dakota | 160 |
| Colorado | 55 |
| Wyoming | 54 |
| Illinois | 4 |
| Kentucky | 1 |
| Oklahoma | 1 |
Well mix
- Oil wells
- 226
- Gas wells
- 7
- Shut-in
- 0
- Active share
- 0%
Is this your company?
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Claim your operator profileWhere does Cardinal Petroleum operate?
Cardinal Petroleum's catalogued wells are spread across 7 states: Montana (271), North Dakota (160), Colorado (55), Wyoming (54) and Illinois (4) and 2 more. Its 271 Montana wells are 0.6% of the 42,011 catalogued in that state — its largest share of any state. Counts cover only states whose registries WellCensus has ingested with operator names; wells in Nebraska and Texas (location indexes) and in states without a registry ingest are not yet attributed to any operator.
How many of Cardinal Petroleum’s wells are active, plugged or orphaned?
0.2% of Cardinal Petroleum's catalogued wells are active, 29 percentage points below the national share of 29%. 97% are plugged & abandoned, against 47% nationally. None of the wells filed under this name is flagged as orphaned.
What kinds of wells does Cardinal Petroleum operate?
By product class, 226 (41%) are oil wells and 7 (1%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is Evensen Trust 1 in Sheridan, MT at 10,682 ft. The wells listed below sit in Sheridan (MT), Daniels (MT), Converse (WY), Campbell (WY), Carter (MT) and Grant (ND) and other counties. State filings spell the name 7 ways; WellCensus merges exact-normalized spellings only, so subsidiaries and affiliates keep their own pages.
Notable wells operated by Cardinal Petroleum
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Evensen Trust 1 | 25-091-21142 | Plugged & abandoned | Other type | Sheridan, MT | Cardinal Petroleum | 10,682 ft |
| Longacre Cook 1 | 25-019-21017 | Plugged & abandoned | Other type | Daniels, MT | Cardinal Petroleum | 10,042 ft |
| Federal 8-15 | 49-009-20190 | Plugged & abandoned | Oil | Converse, WY | Cardinal Petroleum Company | 9,555 ft |
| Kleppen Etal 1 | 25-091-21136 | Plugged & abandoned | Other type | Sheridan, MT | Cardinal Petroleum | 9,435 ft |
| Derington 1 | 49-005-05733 | Plugged & abandoned | Oil | Campbell, WY | Cardinal Petroleum Company | 9,400 ft |
| State 64-1057 1 | 49-005-05727 | Plugged & abandoned | Oil | Campbell, WY | Cardinal Petroleum Company | 9,292 ft |
| Traweek 1 | 25-011-21208 | Plugged & abandoned | Other type | Carter, MT | Cardinal Petroleum | 9,171 ft |
| Federal 8-12 | 49-005-22100 | Plugged & abandoned | Oil | Campbell, WY | Cardinal Petroleum Company | 9,084 ft |
| Federal W-047611 7-10 | 49-005-22200 | Plugged & abandoned | Oil | Campbell, WY | Cardinal Petroleum Company | 9,048 ft |
| Federal 6-6 | 49-005-22348 | Plugged & abandoned | Oil | Campbell, WY | Cardinal Petroleum Company | 9,000 ft |
| Marie Bierwagen 1 | 33-037-00002 | Plugged & abandoned | Oil | Grant, ND | Cardinal Petroleum Co. | 8,860 ft |
| Sam Cymboluk Et Al 1 | 33-007-00068 | Plugged & abandoned | Oil | Billings, ND | Cardinal Petroleum Co. | 8,600 ft |
Deepest first where depth is published. See all 546 wells →
Frequently asked questions
How many wells does Cardinal Petroleum operate?
Cardinal Petroleum is the operator of record for 546 catalogued oil & gas wells, with the largest concentration in Montana (271). Only wells in states WellCensus has ingested are counted.
How many of Cardinal Petroleum's wells are still active?
1 of Cardinal Petroleum's catalogued wells are active; 532 are plugged & abandoned.
In which states does Cardinal Petroleum operate wells?
Cardinal Petroleum is the operator of record for wells in Montana (271), North Dakota (160), Colorado (55), Wyoming (54), Illinois (4), Kentucky (1) and Oklahoma (1).
Does Cardinal Petroleum operate mostly oil or gas wells?
226 of Cardinal Petroleum's catalogued wells are oil wells and 7 are gas wells; the rest are injection, service or unclassified wells.
What is Cardinal Petroleum's deepest well?
Among wells with a published depth, Evensen Trust 1 in Sheridan, MT is the deepest at 10,682 ft.
Where Cardinal Petroleum's wells are
- Oil & gas wells in Montana· 271 operated by Cardinal Petroleum
- Oil & gas wells in North Dakota· 160 operated by Cardinal Petroleum
- Oil & gas wells in Colorado· 55 operated by Cardinal Petroleum
- Oil & gas wells in Wyoming· 54 operated by Cardinal Petroleum
- Oil & gas wells in Illinois· 4 operated by Cardinal Petroleum
- Oil & gas wells in Kentucky· 1 operated by Cardinal Petroleum
- Largest U.S. well operators
- All well operators
About this data
Source: State oil & gas regulator registries (operator of record as filed, exact-normalized across states) plus the USGS United States Documented Orphaned Well Database (2026), as published October 10, 2026 — WellCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: WellCensus, “Cardinal Petroleum — well portfolio”, https://wellcensus.com/operators/cardinal-petroleum-2313 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).