Sierra Petroleum
Operator of record for 39 catalogued wells across 4 states. Every well below links to its full registry page.
Filed as: SIERRA PETROLEUM CO INC · SIERRA PETROLEUM INC · Sierra Petroleum Co., Inc.
At a glance
Sierra Petroleum is the operator of record for 39 catalogued U.S. oil & gas wells in 4 states. None is listed as active, 38 (97%) are plugged & abandoned. Its largest concentration is in Kansas, with 30 wells (77% of its portfolio).
Wells operated
39
Active
0
Plugged
38
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| Kansas | 30 |
| Colorado | 5 |
| Oklahoma | 3 |
| Wyoming | 1 |
Well mix
- Oil wells
- 8
- Gas wells
- 1
- Shut-in
- 0
- Active share
- 0%
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Claim your operator profileWhere does Sierra Petroleum operate?
Sierra Petroleum's catalogued wells are spread across 4 states: Kansas (30), Colorado (5), Oklahoma (3) and Wyoming (1). Its 30 Kansas wells are 0.0% of the 473,140 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 Sierra Petroleum’s wells are active, plugged or orphaned?
0% of Sierra 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 Sierra Petroleum operate?
By product class, 8 (21%) are oil wells and 1 (3%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is 1 Hasser in Prowers, CO at 5,920 ft. The wells listed below sit in Prowers (CO), Baca (CO), Harper (KS), Kingman (KS), Weston (WY) and Ellsworth (KS) and other counties. State filings spell the name 3 ways; WellCensus merges exact-normalized spellings only, so subsidiaries and affiliates keep their own pages.
Notable wells operated by Sierra Petroleum
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| 1 Hasser | 05-099-05005 | Plugged & abandoned | Other type | Prowers, CO | Sierra Petroleum Co Inc | 5,920 ft |
| 1 Cadwalder | 05-009-05011 | Plugged & abandoned | Other type | Baca, CO | Sierra Petroleum Co Inc | 5,239 ft |
| 1 Smith | 05-099-05032 | Plugged & abandoned | Other type | Prowers, CO | Sierra Petroleum Co Inc | 5,145 ft |
| Hudson 1 | 15-077-00184 | Plugged & abandoned | Other type | Harper, KS | Sierra Petroleum Co., Inc. | 5,032 ft |
| Browning 1 | 15-077-00278 | Plugged & abandoned | Other type | Harper, KS | Sierra Petroleum Co., Inc. | 4,824 ft |
| Creighton 1 | 15-095-19152 | Plugged & abandoned | Other type | Kingman, KS | Sierra Petroleum Co., Inc. | 4,788 ft |
| Magee 1 | 49-045-07095 | Plugged & abandoned | Oil | Weston, WY | Sierra Petroleum Inc | 4,687 ft |
| Gaider 1 | 15-095-30092 | Plugged & abandoned | Other type | Kingman, KS | Sierra Petroleum Co., Inc. | 4,590 ft |
| Harbacek 5 | 15-053-01383 | Plugged & abandoned | Injection | Ellsworth, KS | Sierra Petroleum Co., Inc. | 3,966 ft |
| Noah 1 | 15-051-30321 | Plugged & abandoned | Other type | Ellis, KS | Sierra Petroleum Co., Inc. | 3,820 ft |
| Landgren 'B' 4 | 15-113-21116 | Plugged & abandoned | Oil | Mcpherson, KS | Sierra Petroleum Co., Inc. | 3,630 ft |
| Kanzelmeyer 2 | 15-147-00952 | Plugged & abandoned | Oil | Phillips, KS | Sierra Petroleum Co., Inc. | 3,605 ft |
Deepest first where depth is published. See all 39 wells →
Frequently asked questions
How many wells does Sierra Petroleum operate?
Sierra Petroleum is the operator of record for 39 catalogued oil & gas wells, with the largest concentration in Kansas (30). Only wells in states WellCensus has ingested are counted.
How many of Sierra Petroleum's wells are still active?
0 of Sierra Petroleum's catalogued wells are active; 38 are plugged & abandoned.
In which states does Sierra Petroleum operate wells?
Sierra Petroleum is the operator of record for wells in Kansas (30), Colorado (5), Oklahoma (3) and Wyoming (1).
Does Sierra Petroleum operate mostly oil or gas wells?
8 of Sierra Petroleum's catalogued wells are oil wells and 1 are gas wells; the rest are injection, service or unclassified wells.
What is Sierra Petroleum's deepest well?
Among wells with a published depth, 1 Hasser in Prowers, CO is the deepest at 5,920 ft.
Where Sierra Petroleum'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, “Sierra Petroleum — well portfolio”, https://wellcensus.com/operators/sierra-petroleum-6646 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).