Gilliam Drilling
Operator of record for 56 catalogued wells across 3 states. Every well below links to its full registry page.
Filed as: GILLIAM DRILLING CO · Gilliam Drilling Company
At a glance
Gilliam Drilling is the operator of record for 56 catalogued U.S. oil & gas wells in 3 states. 6 (11%) are active, 48 (86%) plugged & abandoned. Its largest concentration is in Illinois, with 50 wells (89% of its portfolio).
Wells operated
56
Active
6
Plugged
48
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| Illinois | 50 |
| Colorado | 4 |
| Kentucky | 2 |
Well mix
- Oil wells
- 28
- Gas wells
- 1
- Shut-in
- 1
- Active share
- 11%
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Claim your operator profileWhere does Gilliam Drilling operate?
Gilliam Drilling's catalogued wells are spread across 3 states: Illinois (50), Colorado (4) and Kentucky (2). Its 50 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 Gilliam Drilling’s wells are active, plugged or orphaned?
11% of Gilliam Drilling's catalogued wells are active, 18 percentage points below the national share of 29%. 86% are plugged & abandoned, against 47% nationally. 1 wells (2%) are shut-in — unplugged but idle. None of the wells filed under this name is flagged as orphaned.
What kinds of wells does Gilliam Drilling operate?
By product class, 28 (50%) are oil wells and 1 (2%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is 1 Rodman Et Al in Weld, CO at 5,890 ft. The wells listed below sit in Weld (CO), Morgan (CO), White (IL), Wayne (IL) and Richland (IL). 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 Gilliam Drilling
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| 1 Rodman Et Al | 05-123-05579 | Plugged & abandoned | Other type | Weld, CO | Gilliam Drilling Co | 5,890 ft |
| 1-A Rodman | 05-123-05581 | Plugged & abandoned | Gas | Weld, CO | Gilliam Drilling Co | 5,832 ft |
| 1 Hayes | 05-087-05203 | Plugged & abandoned | Other type | Morgan, CO | Gilliam Drilling Co | 5,261 ft |
| 1 Wagers | 05-087-05343 | Plugged & abandoned | Other type | Morgan, CO | Gilliam Drilling Co | 5,241 ft |
| Newcomb Everett 1 | 12-193-01996 | Plugged & abandoned | Other type | White, IL | Gilliam Drilling Company | 3,292 ft |
| Long, A. 1 | 12-191-00719 | Plugged & abandoned | Other type | Wayne, IL | Gilliam Drilling Company | 3,292 ft |
| Williams Geo B Etal 1 | 12-193-05031 | Plugged & abandoned | Other type | White, IL | Gilliam Drilling Company | 3,290 ft |
| Bobbett L R 1 | 12-191-00821 | Plugged & abandoned | Oil | Wayne, IL | Gilliam Drilling Company | 3,281 ft |
| Provines Forrest 1 | 12-159-01818 | Plugged & abandoned | Other type | Richland, IL | Gilliam Drilling Company | 3,230 ft |
| McKnight A L 1 | 12-193-01097 | Plugged & abandoned | Other type | White, IL | Gilliam Drilling Company | 3,204 ft |
| Bohleber Minnie 1 | 12-193-05269 | Plugged & abandoned | Other type | White, IL | Gilliam Drilling Company | 3,190 ft |
| Taylor R R 1 | 12-193-05279 | Plugged & abandoned | Oil | White, IL | Gilliam Drilling Company | 3,159 ft |
Deepest first where depth is published. See all 56 wells →
Frequently asked questions
How many wells does Gilliam Drilling operate?
Gilliam Drilling is the operator of record for 56 catalogued oil & gas wells, with the largest concentration in Illinois (50). Only wells in states WellCensus has ingested are counted.
How many of Gilliam Drilling's wells are still active?
6 of Gilliam Drilling's catalogued wells are active; 48 are plugged & abandoned.
In which states does Gilliam Drilling operate wells?
Gilliam Drilling is the operator of record for wells in Illinois (50), Colorado (4) and Kentucky (2).
Does Gilliam Drilling operate mostly oil or gas wells?
28 of Gilliam Drilling's catalogued wells are oil wells and 1 are gas wells; the rest are injection, service or unclassified wells.
What is Gilliam Drilling's deepest well?
Among wells with a published depth, 1 Rodman Et Al in Weld, CO is the deepest at 5,890 ft.
Where Gilliam Drilling'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, “Gilliam Drilling — well portfolio”, https://wellcensus.com/operators/gilliam-drilling-5350 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).