WYOMING · WELLS · CROOK COUNTY · API 49-011-20278
Larsen Fed 12
Shut inVertical oil wellWOGCC status: Shut-In
- Operator of record
- Black Thunder Oil LLC
- Permitted by
- L & J Operating Inc
- County
- Crook
- Field
- Thornton
A vertical oil well in Crook County, Wyoming, operated by Black Thunder Oil LLC. WOGCC status: shut-in.
Spudded September 25, 1977.
Completed in 3 fields: Thornton, Thornton, Thornton.
It has reported 7,027 bbl of oil, 0 Mcf of gas, and 0 bbl of water since the record begins in January 1978; in the twelve months through August 2026, 31 bbl, 0 Mcf, and 0 bbl.
- 31
- bbl oil, 12 months through Aug 2026
- 0
- Mcf gas, same 12 months
- 0
- bbl produced water, same 12 months
- 7,027
- bbl oil since Jan 1978 · 0 Mcf gas
- Status
- Approved · WOGCC: Drilling or Drilled Permit
- Approved
- Sep 21, 1977
- Operator
- L & J Operating Inc
- Proposed formation
- Turner
- Target depth
- 850 ft
Wells nearby
Every well with a location on file around this well, in any state, nearest first.
Reported production
Every month on file for this well on form 2, summed across its fields and the operators that filed it. The newest months can still be amended.
12 months through Aug 2026 31 · prior 12 18(+72%)
Larsen Fed 12: Oil by month.
Completions
ONE PER RESERVOIR THE WELL IS COMPLETED IN
Formation tops
Download CSV →3 tops as filed, by depth. A formation filed more than once is listed each time.
| Formation | Depth |
|---|---|
| CARLILE,MBR (CODY SH) | 0 ft |
| TURNER,SANDY MBR (CARLILE SH) | 580 ft |
| CODY,FM | 612 ft |
Source: Wyoming Oil and Gas Conservation Commission, "Geological Markers Based On Form 3"
Formation tops nearby
Operators of record
| Operator | From | To |
|---|---|---|
| Black Thunder Oil LLC | Jan 4, 2016 | today |
| Kings X Oil Company LLC | Jan 1, 2000 | Jan 4, 2016 |
Well record
- API number
- 49-011-20278
- Location
- SW SW 33-49N-66W · 330 FSL, 430 FWL
- Coordinates
- 44.17961, -104.79864 ↗
- Elevation
- 4,340 ft UGR
- Total depth
- 850 ft
- Land
- Federal
- Basin, as WOGCC files it
- Powder River Basin
- APD
- Approved Sep 21, 1977
- Proposed formation
- Turner
- Target depth
- 850 ft
- Spudded
- Sep 25, 1977
About this data
Wyoming Oil and Gas Conservation Commission (WOGCC), from its public database extracts. Status and type are in WOGCC's own words. Production and injection are what operators filed on form 2, by well and month; twelve-month figures end in Aug 2026, the last month whose filings are in. Locations are from the well's location plat and are approximate. The Commission's production file names each well's current operator on every month, so an operator's figures are those of the wells it operates today. Nothing is estimated.
Developers: this page as JSON is GET /v1/data/wells/4901120278, documented in the API reference.