Sigma Oil
Operator of record for 9 catalogued wells across 1 state. Every well below links to its full registry page.
At a glance
Sigma Oil is the operator of record for 9 catalogued U.S. oil & gas wells in 1 state. 3 (33%) are active, 5 (56%) plugged & abandoned. Its largest concentration is in Illinois, with 9 wells (100% of its portfolio).
Wells operated
9
Active
3
Plugged
5
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| Illinois | 9 |
Well mix
- Oil wells
- 6
- Gas wells
- 0
- Shut-in
- 0
- Active share
- 33%
Is this your company?
Claim Sigma Oil to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Sigma Oil operate?
Sigma Oil's catalogued wells are spread across 1 state: Illinois (9). Its 9 Illinois wells are 0.0% of the 174,478 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 Sigma Oil’s wells are active, plugged or orphaned?
33% of Sigma Oil's catalogued wells are active, 4 percentage points above the national share of 29%. 56% are plugged & abandoned, against 47% nationally. None of the wells filed under this name is flagged as orphaned.
What kinds of wells does Sigma Oil operate?
By product class, 6 (67%) 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 Gray, Winiford 4 in Wabash, IL at 3,540 ft.
Notable wells operated by Sigma Oil
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Gray, Winiford 4 | 12-185-02238 | Active | Oil | Wabash, IL | Sigma Oil Company | 3,540 ft |
| Gray, Winiford 6 | 12-185-26269 | Active | Oil | Wabash, IL | Sigma Oil Company | 2,887 ft |
| Gray Winiford 7 | 12-185-26559 | Active | Oil | Wabash, IL | Sigma Oil Company | 2,882 ft |
| B & A Shultz 3 | 12-185-26352 | Other status | Oil | Wabash, IL | Sigma Oil Company | 2,858 ft |
| Gray A 3 | 12-185-05787 | Plugged & abandoned | Other type | Wabash, IL | Sigma Oil Company | 2,851 ft |
| Epler A E Etal 1 | 12-185-05454 | Plugged & abandoned | Other type | Wabash, IL | Sigma Oil Company | 2,659 ft |
| Compton Etal "B" 1 | 12-185-05551 | Plugged & abandoned | Oil | Wabash, IL | Sigma Oil Company | 2,610 ft |
| Compton 2A | 12-185-05506 | Plugged & abandoned | Oil | Wabash, IL | Sigma Oil Company | 2,580 ft |
| Compton 1-A | 12-185-05497 | Plugged & abandoned | Other type | Wabash, IL | Sigma Oil Company | 2,573 ft |
Deepest first where depth is published. See all 9 wells →
Frequently asked questions
How many wells does Sigma Oil operate?
Sigma Oil is the operator of record for 9 catalogued oil & gas wells, with the largest concentration in Illinois (9). Only wells in states WellCensus has ingested are counted.
How many of Sigma Oil's wells are still active?
3 of Sigma Oil's catalogued wells are active; 5 are plugged & abandoned.
In which states does Sigma Oil operate wells?
Sigma Oil is the operator of record for wells in Illinois (9).
Does Sigma Oil operate mostly oil or gas wells?
6 of Sigma Oil's catalogued wells are oil wells and 0 are gas wells; the rest are injection, service or unclassified wells.
What is Sigma Oil's deepest well?
Among wells with a published depth, Gray, Winiford 4 in Wabash, IL is the deepest at 3,540 ft.
Where Sigma 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, “Sigma Oil — well portfolio”, https://wellcensus.com/operators/sigma-oil-67107 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).