Mammoth Producing & Refining
Operator of record for 11 catalogued wells across 1 state. Every well below links to its full registry page.
At a glance
Mammoth Producing & Refining is the operator of record for 11 catalogued U.S. oil & gas wells in 1 state. 2 (18%) are active, 7 (64%) plugged & abandoned and 1 flagged as orphaned. Its largest concentration is in Illinois, with 11 wells (100% of its portfolio).
Wells operated
11
Active
2
Plugged
7
Orphaned
1
Portfolio by state
| State | Wells |
|---|---|
| Illinois | 11 |
Well mix
- Oil wells
- 6
- Gas wells
- 0
- Shut-in
- 1
- Active share
- 18%
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Claim your operator profileWhere does Mammoth Producing & Refining operate?
Mammoth Producing & Refining's catalogued wells are spread across 1 state: Illinois (11). Its 11 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 Mammoth Producing & Refining’s wells are active, plugged or orphaned?
18% of Mammoth Producing & Refining's catalogued wells are active, 11 percentage points below the national share of 29%. 64% are plugged & abandoned, against 47% nationally. 1 wells (9%) are shut-in — unplugged but idle. 1 wells filed under this name are flagged as orphaned — unplugged, with no operator able to plug them.
What kinds of wells does Mammoth Producing & Refining operate?
By product class, 6 (55%) 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 Stewart Glenn G 1 in Richland, IL at 3,201 ft. The wells listed below sit in Richland (IL), Clay (IL) and White (IL).
Notable wells operated by Mammoth Producing & Refining
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Stewart Glenn G 1 | 12-159-01626 | Shut-in | Other type | Richland, IL | Mammoth Producing & Refining Corp. | 3,201 ft |
| Bemis 1 | 12-025-02956 | Plugged & abandoned | Other type | Clay, IL | Mammoth Producing & Refining Corp. | 3,168 ft |
| McCauley R W 1 | 12-159-00082 | Plugged & abandoned | Other type | Richland, IL | Mammoth Producing & Refining Corp. | 3,123 ft |
| Bell A W 4 | 12-159-00624 | Orphaned | Oil | Richland, IL | Mammoth Producing & Refining Corp. | 3,085 ft |
| Ring 1 | 12-159-00617 | Active | Oil | Richland, IL | Mammoth Producing & Refining Corp. | 3,081 ft |
| Brace-McCauley 1 | 12-159-01637 | Plugged & abandoned | Oil | Richland, IL | Mammoth Producing & Refining Corp. | 3,069 ft |
| Ring, E F 2 | 12-159-00623 | Plugged & abandoned | Oil | Richland, IL | Mammoth Producing & Refining Corp. | 3,059 ft |
| Fitzgerald, Belle 1 | 12-193-04264 | Plugged & abandoned | Other type | White, IL | Mammoth Producing & Refining Corp. | 3,025 ft |
| Heitz Leo 1 | 12-159-00160 | Plugged & abandoned | Injection | Richland, IL | Mammoth Producing & Refining Corp. | 3,010 ft |
| Heitz Leo 3 | 12-159-02107 | Plugged & abandoned | Oil | Richland, IL | Mammoth Producing & Refining Corp. | 3,010 ft |
| Marsh, Charles 5 | 12-025-02583 | Active | Oil | Clay, IL | Mammoth Producing & Refining Corp. | 2,753 ft |
Deepest first where depth is published. See all 11 wells →
Frequently asked questions
How many wells does Mammoth Producing & Refining operate?
Mammoth Producing & Refining is the operator of record for 11 catalogued oil & gas wells, with the largest concentration in Illinois (11). Only wells in states WellCensus has ingested are counted.
How many of Mammoth Producing & Refining's wells are still active?
2 of Mammoth Producing & Refining's catalogued wells are active; 7 are plugged & abandoned and 1 are flagged as orphaned.
In which states does Mammoth Producing & Refining operate wells?
Mammoth Producing & Refining is the operator of record for wells in Illinois (11).
Does Mammoth Producing & Refining operate mostly oil or gas wells?
6 of Mammoth Producing & Refining's catalogued wells are oil wells and 0 are gas wells; the rest are injection, service or unclassified wells.
What is Mammoth Producing & Refining's deepest well?
Among wells with a published depth, Stewart Glenn G 1 in Richland, IL is the deepest at 3,201 ft.
Where Mammoth Producing & Refining'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, “Mammoth Producing & Refining — well portfolio”, https://wellcensus.com/operators/mammoth-producing-refining-67000 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).