Nielson & Associates
Operator of record for 49 catalogued wells across 4 states. Every well below links to its full registry page.
Filed as: NIELSON & ASSOCIATES INC · NIELSON & ASSOCIATES, INC · Nielson & Associates, Inc.
At a glance
Nielson & Associates is the operator of record for 49 catalogued U.S. oil & gas wells in 4 states. None is listed as active, 24 (49%) are plugged & abandoned. Its largest concentration is in Colorado, with 42 wells (86% of its portfolio).
Wells operated
49
Active
0
Plugged
24
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| Colorado | 42 |
| Oklahoma | 4 |
| Montana | 2 |
| Wyoming | 1 |
Well mix
- Oil wells
- 12
- Gas wells
- 1
- Shut-in
- 0
- Active share
- 0%
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Claim your operator profileWhere does Nielson & Associates operate?
Nielson & Associates's catalogued wells are spread across 4 states: Colorado (42), Oklahoma (4), Montana (2) and Wyoming (1). Its 42 Colorado wells are 0.0% of the 124,327 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 Nielson & Associates’s wells are active, plugged or orphaned?
0% of Nielson & Associates's catalogued wells are active, 29 percentage points below the national share of 29%. 49% are plugged & abandoned, against 47% nationally. None of the wells filed under this name is flagged as orphaned.
What kinds of wells does Nielson & Associates operate?
By product class, 12 (24%) 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 21-1 North Wellington in Larimer, CO at 7,650 ft. The wells listed below sit in Larimer (CO), Jackson (CO), Converse (WY) and Fergus (MT). 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 Nielson & Associates
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| 21-1 North Wellington | 05-069-06330 | Plugged & abandoned | Oil | Larimer, CO | Nielson & Associates, Inc | 7,650 ft |
| 107 Mccallum Unit | 05-057-06194 | Plugged & abandoned | Oil | Jackson, CO | Nielson & Associates, Inc | 6,540 ft |
| 30 Mccallum Unit | 05-057-05105 | Plugged & abandoned | Oil | Jackson, CO | Nielson & Associates, Inc | 6,090 ft |
| 27 Mccallum Unit | 05-057-05077 | Plugged & abandoned | Oil | Jackson, CO | Nielson & Associates, Inc | 6,070 ft |
| 26 Mccallum Unit | 05-057-05097 | Plugged & abandoned | Other type | Jackson, CO | Nielson & Associates, Inc | 6,040 ft |
| 6 Conoco Federal 21 | 05-057-06200 | Plugged & abandoned | Gas | Jackson, CO | Nielson & Associates, Inc | 5,778 ft |
| 155 Mccallum | 05-057-06387 | Plugged & abandoned | Oil | Jackson, CO | Nielson & Associates, Inc | 4,170 ft |
| Wyoming State-D 1 | 49-009-05696 | Plugged & abandoned | Oil | Converse, WY | Nielson & Associates Inc | 3,990 ft |
| State 32-16 | 25-027-21235 | Plugged & abandoned | Other type | Fergus, MT | Nielson & Associates, Inc. | 2,390 ft |
| 103 Mccallum Unit | 05-057-06190 | Plugged & abandoned | Oil | Jackson, CO | Nielson & Associates, Inc | 1,767 ft |
| 11-1 Bull Mountain | 05-069-06329 | Plugged & abandoned | Oil | Larimer, CO | Nielson & Associates, Inc | 1,740 ft |
| 1 French Woman | 05-069-06328 | Plugged & abandoned | Other type | Larimer, CO | Nielson & Associates, Inc | 1,569 ft |
Deepest first where depth is published. See all 49 wells →
Frequently asked questions
How many wells does Nielson & Associates operate?
Nielson & Associates is the operator of record for 49 catalogued oil & gas wells, with the largest concentration in Colorado (42). Only wells in states WellCensus has ingested are counted.
How many of Nielson & Associates's wells are still active?
0 of Nielson & Associates's catalogued wells are active; 24 are plugged & abandoned.
In which states does Nielson & Associates operate wells?
Nielson & Associates is the operator of record for wells in Colorado (42), Oklahoma (4), Montana (2) and Wyoming (1).
Does Nielson & Associates operate mostly oil or gas wells?
12 of Nielson & Associates's catalogued wells are oil wells and 1 are gas wells; the rest are injection, service or unclassified wells.
What is Nielson & Associates's deepest well?
Among wells with a published depth, 21-1 North Wellington in Larimer, CO is the deepest at 7,650 ft.
Where Nielson & Associates'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, “Nielson & Associates — well portfolio”, https://wellcensus.com/operators/nielson-associates-2815 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).