WELL · 42-461-35304 · DISTRICT 7
Halff Estate 26 #2
Upton County · Spraberry (Trend Area) field · Producing · Vertical
Halff Estate 26 #2 (API 42-461-35304) is a well in Upton County operated by Pioneer Natural Res. USA Inc., completed April 24, 2007 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued March 9, 2007, permitted to 10,400 ft.
It was permitted by JM Cox Resources, L.P. and has since transferred to Pioneer Natural Res. USA Inc. on the wellbore schedule.
Completion filings report 4 formation tops, including San Andres, Spraberry, Dean, Wolfcamp.
Its lease has reported 24.2K barrels of oil and 94.6K mcf of gas since April 2007, last reporting in July 2026. The lease carries 2 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by JM Cox Resources, L.P.; the EWA schedule now lists a different operator.
- Based in
- Spring, TX
- P-5 status
- Active (A)
- P-5 last filed
- Jul 8, 2026
- Permits on file
- 15,628
- Phone
- (972) 444-4001
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 | JM Cox Resources, L.P.Mar 9, 2007 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,400
- total depth, ft
- 1
- permits on file
- Mar 9, 2007
- last permit issued
- Apr 24, 2007
- completed
- 24.2K
- cumulative oil, bbl
- 94.6K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Apr 2007 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Apr 24, 2007
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
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 lease this well is completed on; they carry 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| 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.
- 1JM Cox Resources, L.P.Apr 2007 → Jun 2018
- 2DE3 Operating LLCAug 2018 → May 2021
- 3Pioneer Natural Res. USA, Inc.Jun 2021 → Mar 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 634601-99 | Drill | JM Cox Resources, L.P. | Mar 5, 2007 | Mar 9, 2007 | Mar 21, 2007 | 10,400 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-9-16281 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,662 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| San Andres | 4,790 | -2,128 |
| Spraberry | 6,950 | -4,288 |
| Dean | 8,330 | -5,668 |
| Wolfcamp | 8,790 | -6,128 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,452 | 8,638 | Perforated |
| 8,814 | 8,912 | Perforated |
| 9,012 | 9,144 | Perforated |
| 9,313 | 9,460 | Perforated |
| 9,537 | 9,716 | Perforated |
| 9,854 | 9,972 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 430 | 17.5 | 400 S |
| 8.625 | 4,604 | 11 | 1,400 S |
| 5.5 | 10,290 | 7.875 | 1,200 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 | Jul 30, 2007 | Jul 3, 2007 | Yes |
| 00 | Jul 16, 2007 | — | — |
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 42-461-35304 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-461-35304 → 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/46135304, documented in the API reference.