Guarantee Oil
Operator of record for 3 catalogued wells across 2 states. Every well below links to its full registry page.
Filed as: Guarantee Oil · Guarantee Oil Co.
At a glance
Guarantee Oil is the operator of record for 3 catalogued U.S. oil & gas wells in 2 states. None is listed as active, 3 (100%) are plugged & abandoned. Its largest concentration is in Montana, with 2 wells (67% of its portfolio).
Wells operated
3
Active
0
Plugged
3
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| Montana | 2 |
| California | 1 |
Well mix
- Oil wells
- 1
- Gas wells
- 0
- Shut-in
- 0
- Active share
- 0%
Is this your company?
Claim Guarantee Oil to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Guarantee Oil operate?
Guarantee Oil's catalogued wells are spread across 2 states: Montana (2) and California (1). Its 2 Montana wells are 0.0% 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 Guarantee Oil’s wells are active, plugged or orphaned?
0% of Guarantee Oil'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 Guarantee Oil operate?
By product class, 1 (33%) 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 Lewis 1 in Toole, MT at 1,595 ft. The wells listed below sit in Toole (MT) and San Mateo (CA). 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 Guarantee Oil
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Lewis 1 | 25-101-05253 | Plugged & abandoned | Other type | Toole, MT | Guarantee Oil | 1,595 ft |
| Lewis 2 | 25-101-09150 | Plugged & abandoned | Other type | Toole, MT | Guarantee Oil | 1,576 ft |
| Lease by Guarantee Oil Co. 4 | 04-081-00099 | Plugged & abandoned | Oil | San Mateo, CA | Guarantee Oil Co. | — |
Deepest first where depth is published. See all 3 wells →
Frequently asked questions
How many wells does Guarantee Oil operate?
Guarantee Oil is the operator of record for 3 catalogued oil & gas wells, with the largest concentration in Montana (2). Only wells in states WellCensus has ingested are counted.
How many of Guarantee Oil's wells are still active?
0 of Guarantee Oil's catalogued wells are active; 3 are plugged & abandoned.
In which states does Guarantee Oil operate wells?
Guarantee Oil is the operator of record for wells in Montana (2) and California (1).
Does Guarantee Oil operate mostly oil or gas wells?
1 of Guarantee Oil's catalogued wells are oil wells and 0 are gas wells; the rest are injection, service or unclassified wells.
What is Guarantee Oil's deepest well?
Among wells with a published depth, Lewis 1 in Toole, MT is the deepest at 1,595 ft.
Where Guarantee 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, “Guarantee Oil — well portfolio”, https://wellcensus.com/operators/guarantee-oil-11546 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).