Diamond Shamrock Expl
Operator of record for 75 catalogued wells across 3 states. Every well below links to its full registry page.
Filed as: DIAMOND SHAMROCK EXPL. CO. · Diamond Shamrock Expl · Diamond Shamrock Expl. Co.
At a glance
Diamond Shamrock Expl is the operator of record for 75 catalogued U.S. oil & gas wells in 3 states. None is listed as active, 54 (72%) are plugged & abandoned. Its largest concentration is in Utah, with 69 wells (92% of its portfolio).
Wells operated
75
Active
0
Plugged
54
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| Utah | 69 |
| California | 4 |
| Louisiana | 2 |
Well mix
- Oil wells
- 38
- Gas wells
- 0
- Shut-in
- 0
- Active share
- 0%
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Claim your operator profileWhere does Diamond Shamrock Expl operate?
Diamond Shamrock Expl's catalogued wells are spread across 3 states: Utah (69), California (4) and Louisiana (2). Its 69 Utah wells are 0.2% of the 40,139 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 Diamond Shamrock Expl’s wells are active, plugged or orphaned?
0% of Diamond Shamrock Expl's catalogued wells are active, 29 percentage points below the national share of 29%. 72% are plugged & abandoned, against 47% nationally. None of the wells filed under this name is flagged as orphaned.
What kinds of wells does Diamond Shamrock Expl operate?
By product class, 38 (51%) 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 Sl 12504 001 in Plaquemines, LA at 9,400 ft. The wells listed below sit in Plaquemines (LA), Ouachita (LA), Sacramento (CA), Uintah (UT) and San Joaquin (CA). 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 Diamond Shamrock Expl
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Sl 12504 001 | 17-726-20384 | Plugged & abandoned | Other type | Plaquemines, LA | Diamond Shamrock Expl. Co. | 9,400 ft |
| J B Bonnett 001 | 17-073-22101 | Plugged & abandoned | Other type | Ouachita, LA | Diamond Shamrock Expl. Co. | 6,000 ft |
| Howard Fee 24-1 | 04-067-20255 | Plugged & abandoned | Other type | Sacramento, CA | Diamond Shamrock Expl. Co. | — |
| Vita-Fee 11-5 | 04-067-20254 | Plugged & abandoned | Other type | Sacramento, CA | Diamond Shamrock Expl. Co. | — |
| Hendel Fed 1-8 | 43-047-30057 | Plugged & abandoned | Oil | Uintah, UT | Diamond Shamrock Expl | — |
| E Red Wash Fed 3-5 | 43-047-30002 | Plugged & abandoned | Other type | Uintah, UT | Diamond Shamrock Expl | — |
| Hill Creek Fed 1 | 43-047-11016 | Plugged & abandoned | Other type | Uintah, UT | Diamond Shamrock Expl | — |
| E Red Wash Fed 4-5 | 43-047-30003 | Other status | Oil | Uintah, UT | Diamond Shamrock Expl | — |
| Horseshoe Bend 1 | 43-047-11017 | Plugged & abandoned | Other type | Uintah, UT | Diamond Shamrock Expl | — |
| U V Fed 1-34 | 43-047-30161 | Plugged & abandoned | Other type | Uintah, UT | Diamond Shamrock Expl | — |
| Steffan Fee 46-6 | 04-077-20472 | Plugged & abandoned | Other type | San Joaquin, CA | Diamond Shamrock Expl. Co. | — |
| Peterson Fee 43-17 | 04-077-20393 | Plugged & abandoned | Other type | San Joaquin, CA | Diamond Shamrock Expl. Co. | — |
Deepest first where depth is published. See all 75 wells →
Frequently asked questions
How many wells does Diamond Shamrock Expl operate?
Diamond Shamrock Expl is the operator of record for 75 catalogued oil & gas wells, with the largest concentration in Utah (69). Only wells in states WellCensus has ingested are counted.
How many of Diamond Shamrock Expl's wells are still active?
0 of Diamond Shamrock Expl's catalogued wells are active; 54 are plugged & abandoned.
In which states does Diamond Shamrock Expl operate wells?
Diamond Shamrock Expl is the operator of record for wells in Utah (69), California (4) and Louisiana (2).
Does Diamond Shamrock Expl operate mostly oil or gas wells?
38 of Diamond Shamrock Expl's catalogued wells are oil wells and 0 are gas wells; the rest are injection, service or unclassified wells.
What is Diamond Shamrock Expl's deepest well?
Among wells with a published depth, Sl 12504 001 in Plaquemines, LA is the deepest at 9,400 ft.
Where Diamond Shamrock Expl'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, “Diamond Shamrock Expl — well portfolio”, https://wellcensus.com/operators/diamond-shamrock-expl-11335 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).