Calvert Exploration Northwestern Refining
Operator of record for 1 catalogued wells across 1 state. Every well below links to its full registry page.
At a glance
Calvert Exploration Northwestern Refining is the operator of record for 1 catalogued U.S. oil & gas wells in 1 state. None is listed as active, 1 (100%) are plugged & abandoned. Its largest concentration is in North Dakota, with 1 wells (100% of its portfolio).
Wells operated
1
Active
0
Plugged
1
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| North Dakota | 1 |
Well mix
- Oil wells
- 1
- Gas wells
- 0
- Shut-in
- 0
- Active share
- 0%
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Claim Calvert Exploration Northwestern Refining to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Calvert Exploration Northwestern Refining operate?
Calvert Exploration Northwestern Refining's catalogued wells are spread across 1 state: North Dakota (1). Its 1 North Dakota wells are 0.0% of the 43,680 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 Calvert Exploration Northwestern Refining’s wells are active, plugged or orphaned?
0% of Calvert Exploration Northwestern Refining's catalogued wells are active, 29 percentage points below the national share of 29%. 100% are plugged & abandoned, against 47% nationally. None of the wells filed under this name is flagged as orphaned.
What kinds of wells does Calvert Exploration Northwestern Refining operate?
By product class, 1 (100%) are oil wells and 0 (0%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is Hjalmer Johnson 1 in Mchenry, ND at 4,275 ft.
Notable wells operated by Calvert Exploration Northwestern Refining
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Hjalmer Johnson 1 | 33-049-00073 | Plugged & abandoned | Oil | Mchenry, ND | Calvert Exploration-Northwestern Refining | 4,275 ft |
Deepest first where depth is published. See all 1 wells →
Frequently asked questions
How many wells does Calvert Exploration Northwestern Refining operate?
Calvert Exploration Northwestern Refining is the operator of record for 1 catalogued oil & gas wells, with the largest concentration in North Dakota (1). Only wells in states WellCensus has ingested are counted.
How many of Calvert Exploration Northwestern Refining's wells are still active?
0 of Calvert Exploration Northwestern Refining's catalogued wells are active; 1 are plugged & abandoned.
In which states does Calvert Exploration Northwestern Refining operate wells?
Calvert Exploration Northwestern Refining is the operator of record for wells in North Dakota (1).
Does Calvert Exploration Northwestern Refining operate mostly oil or gas wells?
1 of Calvert Exploration Northwestern Refining's catalogued wells are oil wells and 0 are gas wells; the rest are injection, service or unclassified wells.
What is Calvert Exploration Northwestern Refining's deepest well?
Among wells with a published depth, Hjalmer Johnson 1 in Mchenry, ND is the deepest at 4,275 ft.
Where Calvert Exploration Northwestern Refining's wells are
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, “Calvert Exploration Northwestern Refining — well portfolio”, https://wellcensus.com/operators/calvert-exploration-northwestern-refining-2360 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).