Sierra Oil
Operator of record for 17 catalogued wells across 2 states. Every well below links to its full registry page.
At a glance
Sierra Oil is the operator of record for 17 catalogued U.S. oil & gas wells in 2 states. None is listed as active, 7 (41%) are plugged & abandoned and 9 flagged as orphaned. Its largest concentration is in California, with 13 wells (76% of its portfolio).
Wells operated
17
Active
0
Plugged
7
Orphaned
9
Portfolio by state
| State | Wells |
|---|---|
| California | 13 |
| Illinois | 4 |
Well mix
- Oil wells
- 11
- Gas wells
- 1
- Shut-in
- 0
- Active share
- 0%
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Claim Sierra Oil to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Sierra Oil operate?
Sierra Oil's catalogued wells are spread across 2 states: California (13) and Illinois (4). Its 13 California wells are 0.0% of the 242,471 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 Oil’s wells are active, plugged or orphaned?
0% of Sierra Oil's catalogued wells are active, 29 percentage points below the national share of 29%. 41% are plugged & abandoned, against 47% nationally. 9 wells filed under this name are flagged as orphaned — unplugged, with no operator able to plug them.
What kinds of wells does Sierra Oil operate?
By product class, 11 (65%) are oil wells and 1 (6%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is Messner 1 in Macoupin, IL at 490 ft. The wells listed below sit in Macoupin (IL), Orange (CA), Los Angeles (CA) and Kern (CA).
Notable wells operated by Sierra Oil
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Messner 1 | 12-117-22691 | Plugged & abandoned | Other type | Macoupin, IL | Sierra Oil Co. | 490 ft |
| Ahrling 1-S | 12-117-22725 | Other status | Gas | Macoupin, IL | Sierra Oil Co. | 474 ft |
| Kulenkamp 1 | 12-117-22728 | Orphaned | Other type | Macoupin, IL | Sierra Oil Co. | 440 ft |
| Smith 1 | 12-117-22690 | Plugged & abandoned | Other type | Macoupin, IL | Sierra Oil Co. | 294 ft |
| Farnsworth 3 | 04-059-05982 | Plugged & abandoned | Oil | Orange, CA | Sierra Oil Co. | — |
| Lease by Sierra Oil Co. 2 | 04-037-26070 | Orphaned | Oil | Los Angeles, CA | Sierra Oil Co. | — |
| Lease by Sierra Oil Co. 1 | 04-037-26071 | Orphaned | Oil | Los Angeles, CA | Sierra Oil Co. | — |
| Sierra Oil Co. 1 | 04-029-32802 | Plugged & abandoned | Other type | Kern, CA | Sierra Oil Co. | — |
| Lease by Sierra Oil Co. 4 | 04-037-26073 | Orphaned | Oil | Los Angeles, CA | Sierra Oil Co. | — |
| Lease by Sierra Oil Co. 3 | 04-037-26074 | Orphaned | Oil | Los Angeles, CA | Sierra Oil Co. | — |
| Lease by Sierra Oil Co. 6 | 04-037-26075 | Orphaned | Oil | Los Angeles, CA | Sierra Oil Co. | — |
| Lease by Sierra Oil Co. 7 | 04-037-26076 | Orphaned | Oil | Los Angeles, CA | Sierra Oil Co. | — |
Deepest first where depth is published. See all 17 wells →
Frequently asked questions
How many wells does Sierra Oil operate?
Sierra Oil is the operator of record for 17 catalogued oil & gas wells, with the largest concentration in California (13). Only wells in states WellCensus has ingested are counted.
How many of Sierra Oil's wells are still active?
0 of Sierra Oil's catalogued wells are active; 7 are plugged & abandoned and 9 are flagged as orphaned.
In which states does Sierra Oil operate wells?
Sierra Oil is the operator of record for wells in California (13) and Illinois (4).
Does Sierra Oil operate mostly oil or gas wells?
11 of Sierra Oil's catalogued wells are oil wells and 1 are gas wells; the rest are injection, service or unclassified wells.
What is Sierra Oil's deepest well?
Among wells with a published depth, Messner 1 in Macoupin, IL is the deepest at 490 ft.
Where Sierra Oil'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 Oil — well portfolio”, https://wellcensus.com/operators/sierra-oil-3602 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).