WELL · 42-389-32772 · DISTRICT 8
Big Chief #4801
Reeves County · Wolfbone (Trend Area) field · Vertical
Big Chief #4801 (API 42-389-32772) is a plugged well in Reeves County, plugged January 27, 2020, last operated by Cog Operating LLC.
The RRC has issued 3 drilling permits (amended 3 times) between 2011 and 2015, permitted to 14,500 ft.
Completion filings report 8 formation tops, including Delaware, Castile, Bell Canyon, Bone Spring.
Its 3 leases have reported 8.82M barrels of oil and 15.6M mcf of gas since June 2011, last reporting in July 2026. The leases carry 37 wells, so these are lease totals, not this well alone.
Operator of record
Midland, TX · P-5 Y, filed May 4, 2026 · 4,568 permits on file · (432) 853-2355
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | COG Operating LLC |
| Production reports | Scout Energy Management LLCthrough Apr 2026 |
| Latest permit | COG Operating LLCOct 27, 2015 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 14,500
- total depth, ft
- 6
- permits on file
- Oct 27, 2015
- last permit issued
- Jun 3, 2011
- completed
- 8.82M
- cumulative oil, bbl
- 15.6M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jun 2011 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jun 3, 2011
- Shut in
- —
- Plugged
- Jan 27, 2020
Surface location
No coordinates on the permit record yet. The RRC's GIS record usually lands within days of issuance; historical master-file permits never carry one.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH APR 2026
Texas reports oil by lease, not by well. These are the 3 leases this well is completed on; they carry 37 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Big Chief O-10-44043 | Hoefs T-K (Wolfcamp) | Scout Energy Management LLC | 34 | 8.81M | 15.6M | Jul 2012 – Jul 2026 |
| Big Chief O-10-46940 | Lookski (Bell Canyon) | COG Operating LLC | 1 | 2.74K | 10.9K | Mar 2015 – Sep 2020 |
| Big Chief O-10-41788 | Wolfbone (Trend Area) | COG Operating LLC | 2 | 8.53K | 5.72K | Jun 2011 – Sep 2014 |
Oil, barrels lease total
Last 12 months 428,721 · prior 12 511,185(-16%)
Gas, mcf lease total
Last 12 months 1,497,233 · prior 12 1,075,942(+39%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1COG Operating LLCOct 2011 → Feb 2025
- 2Scout Energy Management LLCMar 2025 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 811492-99 | Recompletion | COG Operating LLC | Oct 26, 2015 | Oct 27, 2015 | Apr 25, 2014 | 8,180 |
| 768517-97 | Recompletion | COG Operating LLC | Mar 3, 2015 | Sep 10, 2013 | — | 7,340 |
| 768517-98 | Drill | COG Operating LLC | May 21, 2014 | Sep 10, 2013 | — | 14,500 |
| 768517-99 | Field transfer | COG Operating LLC | Aug 19, 2013 | Sep 10, 2013 | Apr 2, 2013 | 12,000 |
| 711057-98 | Drill | COG Operating LLC | Apr 19, 2011 | Mar 1, 2011 | Apr 18, 2011 | 14,500 |
| 711057-99 | Drill | COG Operating LLC | Feb 28, 2011 | Mar 1, 2011 | — | 13,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-41788 | — | — | — | — |
| — | — O-10-44043 | — | — | — | — |
| — | — O-10-46940 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,936 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| DelawareFORD-DELAWARE | 2,500 | 436 |
| CastileCASTILLE | 2,800 | 136 |
| Bell Canyon | 4,800 | -1,864 |
| Delaware | 4,850 | -1,914 |
| Bone Spring | 7,836 | -4,900 |
| Wolfcamp | 9,990 | -7,054 |
| Bone SpringBONE SPRINGS | — | — |
| Cherry Canyon | — | — |
| Delaware | — | — |
| DelawareDELAWARE CONSOLIDATED GAS | — | — |
| Pennsylvanian | — | — |
| Permian (undifferentiated)PERMIAN | — | — |
| Wolfcamp | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,900 | 7,910 | Perforated |
| 8,524 | 10,380 | Perforated |
| 10,830 | 10,850 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 1,447 | 17.048 | 1,250 S |
| 13.375 | 1,447 | 17.5 | 1,250 S |
| 9.625 | 5,110 | 12.25 | 1,950 S |
| 7 | 9,858 | 8.75 | 900 S |
| 4.5 | 14,000 | 6.125 | 550 S |
| 7 | — | 8.75 | 400 S |
Completion filings
W-2 and G-1 reports on record in the RRC wellbore file, newest first. The suffix identifies the wellbore or completion event. About these reports →
| Suffix | Filed | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Oct 27, 2015 | Sep 8, 2015 | Yes |
| 00 | Jun 2, 2014 | Sep 12, 2013 | Yes |
| 00 | Apr 22, 2013 | Mar 26, 2012 | — |
| 00 | Sep 11, 2012 | Oct 18, 2011 | Yes |
The source documents
Petrora holds the structured record. The scanned filings live at the RRC; these links open its search already filled in for this API.
- Wellbore filings for 42-389-32772 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-389-32772 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward) and the University Lands library. then paste it into their search.
About this data
Permits from the RRC OGA049M master and daily daf420 files; wellbore and operator of record from the EWA schedule, weekly; completions, formation tops, casing, and perforations from the dbf900 wellbore file; production from PDQ lease reports, which lag two to three months; injection from UIC permits, H-10 reports, and TexNet daily volumes; earthquakes from the TexNet catalog.
New to these records? How to read a well page · API numbers · completion reports and tops · why production is by lease
Developers: this page as JSON is GET /v1/data/wells/38932772, documented in the API reference.