WELL · 42-461-31423 · DISTRICT 7
Halff Estate 26 #1
Upton County · Spraberry (Trend Area) field · Producing · Vertical
Halff Estate 26 #1 (API 42-461-31423) is a well in Upton County operated by Pioneer Natural Res. USA Inc., completed January 1, 2018 and listed as producing on the RRC schedule.
The RRC has issued 2 drilling permits between 1979 and 2022, permitted to 10,500 ft.
Completion filings report 3 formation tops, including Redbeds, San Andres, Spraberry.
Its 2 leases have reported 51.9K barrels of oil and 141K mcf of gas since January 1993, last reporting in July 2026. The leases carry 3 wells, so these are lease totals, not this well alone.
Operator of record
Spring, TX · P-5 Y, filed May 4, 2026 · 15,619 permits on file · (972) 598-8150
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Pioneer Natural Res. USA Inc. |
| Production reports | Pioneer Natural Res. USA, Inc.through Apr 2026 |
| Latest permit | Pioneer Natural Res. USA, Inc.Jun 1, 2022 |
- 10,500
- total depth, ft
- 2
- permits on file
- Jun 1, 2022
- last permit issued
- Jan 1, 2018
- completed
- 51.9K
- cumulative oil, bbl
- 141K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jan 1, 2018
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active
Surface location
31.345287, -102.024415
OpenStreetMap → · Google Maps →
Permit surface location from the RRC GIS record, in Upton County.
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 3 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Halff Estate 26 O-9-7999 | Old Upland (Bend) | Pioneer Natural Res. USA, Inc. | 1 | 27.7K | 46.3K | Jan 1993 – Jul 2026 |
| Halff Estate "26" O-9-16281 | Spraberry (Trend Area) | Pioneer Natural Res. USA, Inc. | 2 | 24.2K | 94.6K | Apr 2007 – Jul 2026 |
Gas, mcf lease total
Last 12 months 567 · prior 12 4,692(-88%)
Oil, barrels lease total
Last 12 months 15 · prior 12 550(-97%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Cox, John L.Jan 1993 → Sep 2003
- 2JM Cox Resources, L.P.Oct 2003 → Jun 2018
- 3DE3 Operating LLCAug 2018 → May 2021
- 4Pioneer Natural Res. USA, Inc.Jun 2021 → Mar 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 879419-99 | Recompletion | Pioneer Natural Res. USA, Inc. | Apr 25, 2022 | Jun 1, 2022 | Jan 1, 2018 | 10,355 |
| 45072-99 | Drill | Cox, John L. | Mar 27, 1979 | Mar 27, 1979 | — | 10,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-9-7999 | — | — | — | — |
| — | — O-9-16281 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,712 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Redbeds | 420 | 2,292 |
| San Andres | 4,450 | -1,738 |
| Spraberry | 6,500 | -3,788 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,694 | 9,169 | Perforated |
| 10,247 | 10,291 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 12.75 | 455 | 17 | 450 S |
| 8.625 | 4,580 | 11 | 500 S |
| 2 | 9,423 | — | — |
| 5.5 | 10,355 | 7.875 | 1,100 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 | Aug 22, 2022 | Jun 9, 2022 | — |
| 00 | Jan 12, 1984 | Oct 2, 1979 | — |
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 42-461-31423 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-461-31423 → 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.
Nearby wells and their tops
NEAREST 8 LOCATED WELLS WITH TOPS · WITHIN 16 KM
Draw a cross-section
This well's tops beside its 5 nearest neighbours, subsea-aligned so they line up regardless of surface terrain.
Amacker 67A42-461-41396
1.7 KM · COG Operating LLC · Section with this well →
| Yates | 2,403 | 293 |
| Grayburg | 2,543 | 153 |
| San Andres | 4,554 | -1,858 |
| Spraberry | 7,164 | -4,468 |
| Wolfcamp | 8,484 | -5,788 |
| Fusselman | — | |
| Ellenburger | — | |
| Devonian | — |
9 TOPS · FIRST 8
Amacker 67B42-461-41395
1.7 KM · COG Operating LLC · Section with this well →
| Yates | 2,418 | 278 |
| Grayburg | 2,558 | 138 |
| San Andres | 4,569 | -1,873 |
| Spraberry | 7,179 | -4,483 |
| Wolfcamp | 8,499 | -5,803 |
| Ellenburger | — | |
| Fusselman | — | |
| Devonian | — |
9 TOPS · FIRST 8
Amacker 66E42-461-41062
1.7 KM · COG Operating LLC · Section with this well →
| Yates | 2,405 | 282 |
| Grayburg | 3,000 | -313 |
| San Andres | 4,597 | -1,910 |
| Spraberry | 7,204 | -4,517 |
| Wolfcamp | 8,505 | -5,818 |
| Strawn | — | |
| Devonian | — | |
| Ellenburger | — |
9 TOPS · FIRST 8
Amacker 66F42-461-41074
1.7 KM · COG Operating LLC · Section with this well →
| Yates | 2,405 | 282 |
| Grayburg | 3,000 | -313 |
| San Andres | 4,597 | -1,910 |
| Spraberry | 7,204 | -4,517 |
| Wolfcamp | 8,505 | -5,818 |
| Devonian | — | |
| Ellenburger | — | |
| Fusselman | — |
9 TOPS · FIRST 8
Amacker 66A42-461-41079
1.8 KM · COG Operating LLC · Section with this well →
| Yates | 2,386 | -2,385 |
| Grayburg | 2,500 | -2,499 |
| San Andres | 4,580 | -4,579 |
| Spraberry | 7,187 | -7,186 |
| Wolfcamp | 8,479 | -8,478 |
| Devonian | — | |
| Ellenburger | — | |
| Strawn | — |
9 TOPS · FIRST 8
Amacker 66B42-461-41080
1.8 KM · COG Operating LLC · Section with this well →
| Yates | 2,386 | 278 |
| Grayburg | 2,500 | 164 |
| San Andres | 4,574 | -1,910 |
| Spraberry | 7,184 | -4,520 |
| Wolfcamp | 8,471 | -5,807 |
| Ellenburger | — | |
| Strawn | — | |
| Fusselman | — |
9 TOPS · FIRST 8
Amacker 67D42-461-41094
1.8 KM · COG Operating LLC · Section with this well →
| Yates | 2,425 | 267 |
| Grayburg | 3,000 | -308 |
| San Andres | 4,563 | -1,871 |
| Spraberry | 7,210 | -4,518 |
| Wolfcamp | 8,493 | -5,801 |
| Devonian | — | |
| Ellenburger | — | |
| Fusselman | — |
9 TOPS · FIRST 8
Amacker 66G42-461-41474
1.8 KM · COG Operating LLC · Section with this well →
| Yates | 2,410 | 305 |
| Grayburg | 4,115 | -1,400 |
| San Andres | 4,615 | -1,900 |
| Spraberry | 7,086 | -4,371 |
| Wolfcamp | 8,511 | -5,796 |
| Fusselman | — | |
| Devonian | — | |
| Strawn | — |
9 TOPS · FIRST 8
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/46131423, documented in the API reference.