TEXAS · WELLS · UPTON COUNTY · API 42-461-35313 · DISTRICT 6E
Blackwell #4
Upton County · Pegasus (Consolidated) field · Vertical
Blackwell #4 (API 42-461-35313) is a plugged well in Upton County, plugged July 14, 2021, last operated by Cog Operating LLC.
The RRC has issued one drilling permit, issued April 3, 2007, permitted to 10,800 ft.
It was permitted by Henry Petroleum LP and has since transferred to Cog Operating LLC on the wellbore schedule.
Completion filings report 5 formation tops, including San Adnres, Clear Fork, Spraberry, Dean.
Its 2 leases have reported 584K barrels of oil and 2.34M mcf of gas since December 2004, last reporting volume in April 2026. The leases carry 13 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Henry Petroleum LP; the EWA schedule now lists a different operator.
- Based in
- Midland, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- Jun 2, 2026
- Permits on file
- 4,568
- Phone
- (432) 683-7443
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | COG Operating LLC |
| Production reports | COG Operating LLCthrough Apr 2026 |
| Latest permit | Henry Petroleum LPApr 3, 2007 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,800
- total depth, ft
- 1
- permits on file
- Apr 3, 2007
- last permit issued
- Jul 25, 2007
- completed
- 584K
- cumulative oil, bbl
- 2.34M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 2004 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jul 25, 2007
- Shut in
- —
- Plugged
- Jul 14, 2021
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 2 leases this well is completed on; they carry 13 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Blackwell O-9-17165 | Pegasus (Consolidated) | COG Operating LLC | 8 | 377K | 1.61M | May 2010 – Apr 2026 |
| Blackwell O-9-15647 | Spraberry (Trend Area) | COG Operating LLC | 5 | 207K | 728K | Dec 2004 – Apr 2010 |
Oil, barrels lease total
Last 12 months 10,885 · prior 12 13,278(-18%)
Gas, mcf lease total
Last 12 months 26,538 · prior 12 29,184(-9%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Henry Petroleum LPDec 2004 → Dec 2008
- 2COG Operating LLCJan 2009 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 634456-99 | Drill | Henry Petroleum LP | Mar 1, 2007 | Apr 3, 2007 | Jun 1, 2007 | 10,800 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jul 25, 2007 | Blackwell O-9-17165 | Pegasus (Consolidated) | COG Operating LLC | Plugged | — |
| Jul 25, 2007 | Blackwell O-9-15647 | Spraberry (Trend Area) | COG Operating LLC | Plugged | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,877 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| San Adnres | 4,838 | -1,961 |
| Clear ForkCLEARFORK | 6,940 | -4,063 |
| Spraberry | 7,718 | -4,841 |
| Dean | 9,010 | -6,133 |
| Wolfcamp | 9,130 | -6,253 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,530 | 10,308 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 525 | 12.25 | 325 S |
| 5.5 | 10,350 | 7.875 | 830 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. The record date is the RRC's own date on the record, not the day the report was filed: 462,034 of the state's filings carry 1984-01-12. About these reports →
| Suffix | RRC record date | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Jun 2, 2010 | Aug 7, 2007 | Yes |
| 00 | Aug 29, 2007 | Aug 7, 2007 | Yes |
| 00 | Aug 14, 2007 | — | — |
Well logs
1 log loaded from the RRC's log index, the latest received Jun 22, 2010. Neutron. These are the logs loaded into Petrora from the Railroad Commission's inventories, not necessarily every log run on the well. The RRC holds the files; each opens from its log search for the well. The kind is the RRC's description of the log; the interval is the one filed for it.
Open the RRC's log search for this well ↗| Logas described | Files | Intervalft, as filed | Datereceived | SizeMB |
|---|---|---|---|---|
| NEUTRON POROSITYSpans San Adnres, Clear Fork, Spraberry, Dean, Wolfcamp | TIFF | 3,000 to 10,328 | Jun 22, 2010run Jun 21, 2007 | 3.82 |
"Spans" is by this well's own filed formation tops: a formation runs from its top to the next deeper top filed, and the deepest runs to the bottom of the log. Depths are measured along the wellbore, so on a horizontal the lateral counts in the formation it was landed in.
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 42-461-35313 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-461-35313 → scanned completion filings
The logs loaded for this well are under Well logs, with the RRC's log search for it. The University Lands library has no per-well link: then paste it into its 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/46135313, documented in the API reference.