Grayson Mill Operating
Operator of record for 141 catalogued wells across 2 states. Every well below links to its full registry page.
Filed as: GRAYSON MILL OPERATING LLC · GRAYSON MILL OPERATING, LLC
At a glance
Grayson Mill Operating is the operator of record for 141 catalogued U.S. oil & gas wells in 2 states. None is listed as active, 2 (1%) are plugged & abandoned. Its largest concentration is in Wyoming, with 107 wells (76% of its portfolio).
Wells operated
141
Active
0
Plugged
2
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| Wyoming | 107 |
| North Dakota | 34 |
Well mix
- Oil wells
- 138
- Gas wells
- 2
- Shut-in
- 2
- Active share
- 0%
Is this your company?
Claim Grayson Mill Operating to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Grayson Mill Operating operate?
Grayson Mill Operating's catalogued wells are spread across 2 states: Wyoming (107) and North Dakota (34). Its 107 Wyoming wells are 0.1% of the 129,957 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 Grayson Mill Operating’s wells are active, plugged or orphaned?
0% of Grayson Mill Operating's catalogued wells are active, 29 percentage points below the national share of 29%. 1% are plugged & abandoned, against 47% nationally. 2 wells (1%) are shut-in — unplugged but idle. None of the wells filed under this name is flagged as orphaned.
What kinds of wells does Grayson Mill Operating operate?
By product class, 138 (98%) are oil wells and 2 (1%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is Dahl 150-98-5-8-8hlw in Mckenzie, ND at 21,960 ft. The wells listed below sit in Mckenzie (ND), Sweetwater (WY) and Converse (WY). State filings spell the name 2 ways; WellCensus merges exact-normalized spellings only, so subsidiaries and affiliates keep their own pages.
Notable wells operated by Grayson Mill Operating
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Dahl 150-98-5-8-8hlw | 33-053-08724 | Plugged & abandoned | Oil | Mckenzie, ND | Grayson Mill Operating, LLC | 21,960 ft |
| Hay Federal 1-20 | 49-037-21912 | Shut-in | Gas | Sweetwater, WY | Grayson Mill Operating LLC | 12,920 ft |
| Pennzoil Federal 1-30 | 49-037-22307 | Shut-in | Gas | Sweetwater, WY | Grayson Mill Operating LLC | 12,862 ft |
| Mount Harvard 39n-71w-27-34 Mah | 49-009-35415 | Other status | Oil | Converse, WY | Grayson Mill Operating LLC | 11,187 ft |
| Mount Harvard 39n-71w-27-34 Mbh | 49-009-35416 | Other status | Oil | Converse, WY | Grayson Mill Operating LLC | 11,164 ft |
| Mount Harvard 39n-71w-27-34 Mch | 49-009-35417 | Other status | Oil | Converse, WY | Grayson Mill Operating LLC | 11,147 ft |
| Mount Harvard 39n-71w-27-34 Mdh | 49-009-35418 | Other status | Oil | Converse, WY | Grayson Mill Operating LLC | 11,127 ft |
| Cetus 387006 29ath | 49-009-37206 | Other status | Oil | Converse, WY | Grayson Mill Operating LLC | 10,856 ft |
| Imp 39-69-29-32 MDAH | 49-009-42084 | Other status | Oil | Converse, WY | Grayson Mill Operating LLC | 10,652 ft |
| Scylla W 39-69-33-34 MDDH | 49-009-42643 | Other status | Oil | Converse, WY | Grayson Mill Operating LLC | 10,552 ft |
| Monocerata 39-69-21-28 MDBH | 49-009-42073 | Other status | Oil | Converse, WY | Grayson Mill Operating LLC | 10,509 ft |
| Thoon 39-69-26-35 MDAH | 49-009-42318 | Other status | Oil | Converse, WY | Grayson Mill Operating LLC | 10,427 ft |
Deepest first where depth is published. See all 141 wells →
Frequently asked questions
How many wells does Grayson Mill Operating operate?
Grayson Mill Operating is the operator of record for 141 catalogued oil & gas wells, with the largest concentration in Wyoming (107). Only wells in states WellCensus has ingested are counted.
How many of Grayson Mill Operating's wells are still active?
0 of Grayson Mill Operating's catalogued wells are active; 2 are plugged & abandoned.
In which states does Grayson Mill Operating operate wells?
Grayson Mill Operating is the operator of record for wells in Wyoming (107) and North Dakota (34).
Does Grayson Mill Operating operate mostly oil or gas wells?
138 of Grayson Mill Operating's catalogued wells are oil wells and 2 are gas wells; the rest are injection, service or unclassified wells.
What is Grayson Mill Operating's deepest well?
Among wells with a published depth, Dahl 150-98-5-8-8hlw in Mckenzie, ND is the deepest at 21,960 ft.
Where Grayson Mill Operating'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, “Grayson Mill Operating — well portfolio”, https://wellcensus.com/operators/grayson-mill-operating-2523 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).