Encore Operating
Operator of record for 203 catalogued wells across 5 states. Every well below links to its full registry page.
Filed as: ENCORE OPERATING INC · ENCORE OPERATING LP · ENCORE OPERATING, L.P. · Encore Operating Company · …
At a glance
Encore Operating is the operator of record for 203 catalogued U.S. oil & gas wells in 5 states. 4 (2%) are active, 176 (87%) plugged & abandoned. Its largest concentration is in Montana, with 119 wells (59% of its portfolio).
Wells operated
203
Active
4
Plugged
176
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| Montana | 119 |
| Kansas | 33 |
| North Dakota | 27 |
| Oklahoma | 22 |
| New Mexico | 2 |
Well mix
- Oil wells
- 95
- Gas wells
- 9
- Shut-in
- 0
- Active share
- 2%
Is this your company?
Claim Encore Operating to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Encore Operating operate?
Encore Operating's catalogued wells are spread across 5 states: Montana (119), Kansas (33), North Dakota (27), Oklahoma (22) and New Mexico (2). Its 119 Montana wells are 0.3% 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 Encore Operating’s wells are active, plugged or orphaned?
2% of Encore Operating's catalogued wells are active, 27 percentage points below the national share of 29%. 87% are plugged & abandoned, against 47% nationally. None of the wells filed under this name is flagged as orphaned.
What kinds of wells does Encore Operating operate?
By product class, 95 (47%) are oil wells and 9 (4%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is Monarch 11-01H in Fallon, MT at 14,326 ft. The wells listed below sit in Fallon (MT), Richland (MT), Dawson (MT), Billings (ND), Wibaux (MT) and Prairie (MT). State filings spell the name 5 ways; WellCensus merges exact-normalized spellings only, so subsidiaries and affiliates keep their own pages.
Notable wells operated by Encore Operating
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Monarch 11-01H | 25-025-21992 | Plugged & abandoned | Oil | Fallon, MT | Encore Operating LP | 14,326 ft |
| Wick 1 | 25-083-21105 | Plugged & abandoned | Oil | Richland, MT | Encore Operating LP | 12,630 ft |
| Obergfell 1 | 25-083-21057 | Plugged & abandoned | Injection | Richland, MT | Encore Operating LP | 12,570 ft |
| Federal 11X-07H | 25-021-21171 | Plugged & abandoned | Oil | Dawson, MT | Encore Operating LP | 12,411 ft |
| Unit 33-18CH | 25-025-21344 | Plugged & abandoned | Oil | Fallon, MT | Encore Operating LP | 12,364 ft |
| Unit 12X-20BH | 25-025-22724 | Plugged & abandoned | Other type | Fallon, MT | Encore Operating LP | 11,401 ft |
| Franks Creek State 4-23 | 33-007-00287 | Plugged & abandoned | Oil | Billings, ND | Encore Operating, L.P. | 9,400 ft |
| Franks Creek State 3-23 | 33-007-00284 | Plugged & abandoned | Oil | Billings, ND | Encore Operating, L.P. | 9,370 ft |
| Unit 21-24A | 25-109-05038 | Plugged & abandoned | Injection | Wibaux, MT | Encore Operating LP | 9,270 ft |
| Unit 32-29C | 25-079-05090 | Plugged & abandoned | Oil | Prairie, MT | Encore Operating LP | 9,265 ft |
| Unit 22X-36 | 25-025-05284 | Plugged & abandoned | Oil | Fallon, MT | Encore Operating LP | 9,242 ft |
| Unit 34-24A | 25-109-05013 | Plugged & abandoned | Injection | Wibaux, MT | Encore Operating LP | 9,214 ft |
Deepest first where depth is published. See all 203 wells →
Frequently asked questions
How many wells does Encore Operating operate?
Encore Operating is the operator of record for 203 catalogued oil & gas wells, with the largest concentration in Montana (119). Only wells in states WellCensus has ingested are counted.
How many of Encore Operating's wells are still active?
4 of Encore Operating's catalogued wells are active; 176 are plugged & abandoned.
In which states does Encore Operating operate wells?
Encore Operating is the operator of record for wells in Montana (119), Kansas (33), North Dakota (27), Oklahoma (22) and New Mexico (2).
Does Encore Operating operate mostly oil or gas wells?
95 of Encore Operating's catalogued wells are oil wells and 9 are gas wells; the rest are injection, service or unclassified wells.
What is Encore Operating's deepest well?
Among wells with a published depth, Monarch 11-01H in Fallon, MT is the deepest at 14,326 ft.
Where Encore Operating's wells are
- Oil & gas wells in Montana· 119 operated by Encore Operating
- Oil & gas wells in Kansas· 33 operated by Encore Operating
- Oil & gas wells in North Dakota· 27 operated by Encore Operating
- Oil & gas wells in Oklahoma· 22 operated by Encore Operating
- Oil & gas wells in New Mexico· 2 operated by Encore Operating
- 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, “Encore Operating — well portfolio”, https://wellcensus.com/operators/encore-operating-2173 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).