WELL · 42-461-33943 · DISTRICT 7
Windham 4H #8
Upton County · Spraberry (Trend Area) field · Vertical
Windham 4h #8 (API 42-461-33943) is a well in Upton County operated by Diamondback E&P LLC, completed November 23, 1998.
The RRC has issued one drilling permit (amended once), issued July 1, 1998, permitted to 9,250 ft.
It was permitted by Concho Resources Inc. and has since transferred to Diamondback E&P LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Top Of U. Spraberry, Top Of L. Spraberry, Dean.
Its 2 leases have reported 271K barrels of oil and 617K mcf of gas since January 1993, last reporting in July 2026. The leases carry 10 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Concho Resources Inc.; the EWA schedule now lists a different operator.
- Based in
- Midland, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- May 4, 2026
- Permits on file
- 5,237
- Phone
- (432) 221-7400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Diamondback E&P LLC |
| Production reports | Diamondback E&P LLCthrough Jun 2025 |
| Latest permit | Concho Resources Inc.Jul 1, 1998 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 9,250
- total depth, ft
- 2
- permits on file
- Jul 1, 1998
- last permit issued
- Nov 23, 1998
- completed
- 271K
- cumulative oil, bbl
- 617K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Nov 23, 1998
- Shut in
- —
- Plugged
- —
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 10 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Windham "4H" O-9-11389 | Spraberry (Trend Area) | Diamondback E&P LLC | 9 | 266K | 614K | Jan 1993 – Jul 2026 |
| Windham "4E" O-9-21202 | Spraberry (Trend Area) | COG Operating LLC | 1 | 4.23K | 3.41K | Nov 2020 – Jul 2026 |
Oil, barrels lease total
Last 12 months 83 · prior 12 685(-88%)
Gas, mcf lease total
Last 12 months 0 · prior 12 248(-100%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Costilla Petroleum CorporationJan 1993 → Jan 1997
- 2Costilla Energy, Inc.Feb 1997 → Dec 1997
- 3Concho Resources Inc.Jan 1998 → Jun 2001
- 4Devon Energy Production Co, L.P.Jul 2001 → Jun 2002
- 5Merit Energy CompanyJul 2002 → Nov 2013
- 6Hunt Oil CompanyDec 2013 → Jan 2018
- 7Endeavor Energy Resources L.P.Feb 2018 → May 2023
- 8COG Operating LLCNov 2020 → Jan 2025
- 9DE IV Operating, LLCJun 2023 → Sep 2024
- 10Diamondback E&P LLCJun 2025 → Jun 2025
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 476975-98 | Drill | Concho Resources Inc. | Dec 22, 1998 | Jul 1, 1998 | Sep 8, 1998 | 9,250 |
| 476975-99 | Drill | Concho Resources Inc. | Jun 8, 1998 | Jul 1, 1998 | — | 9,100 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-9-11389 | — | — | — | — |
| — | — O-9-21202 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,845 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,695 | 7,885 | Perforated |
| 8,261 | 8,534 | Perforated |
| 8,966 | 9,128 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 12.75 | 419 | 17.5 | 400 S |
| 4.5 | 9,250 | 7.875 | 1,475 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 | Jan 29, 2021 | Dec 11, 1998 | Yes |
| 00 | Mar 17, 1999 | Dec 11, 1998 | Yes |
| 00 | Feb 23, 1999 | — | — |
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 42-461-33943 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-461-33943 → 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/46133943, documented in the API reference.