TEXAS · WELLS · UPTON COUNTY · HALFF ESTATE -D- LEASE · API 42-461-31346 · DISTRICT 6E
Halff Estate -D- #1
Upton County · Old Upland (Bend) field · Producing · Vertical
Halff Estate -D- #1 (API 42-461-31346) is a well in Upton County operated by Pioneer Natural Res. USA Inc., completed November 5, 1978 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued August 21, 1978, permitted to 10,350 ft.
It was permitted by Cox, John L. and has since transferred to Pioneer Natural Res. USA Inc. on the wellbore schedule.
Its lease has reported 54K barrels of oil and 135K mcf of gas since January 1993, last reporting in July 2026.
Operator of record
Permitted by Cox, John L.; 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 | Cox, John L.Aug 21, 1978 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,350
- total depth, ft
- 1
- permits on file
- Aug 21, 1978
- last permit issued
- Nov 5, 1978
- completed
- 54K
- cumulative oil, bbl
- 135K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Nov 5, 1978
- 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; this well is the only one on it.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Halff Estate -D- O-9-7655 | Old Upland (Bend) | Pioneer Natural Res. USA, Inc. | 1 | 54K | 135K | Jan 1993 – Jul 2026 |
Gas, mcf lease total
Last 12 months 2,491 · prior 12 4,352(-43%)
Oil, barrels lease total
Last 12 months 497 · prior 12 593(-16%)
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 → Jul 2018
- 3DE3 Operating LLCAug 2018 → May 2021
- 4Pioneer Natural Res. USA, Inc.Jun 2021 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 31004-99 | Drill | Cox, John L. | Aug 21, 1978 | Aug 21, 1978 | — | 10,300 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Nov 5, 1978 | Halff Estate -D- O-9-7655 | Old Upland (Bend) | Pioneer Natural Res. USA Inc. | Producing | 10,350 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 10,225 | 10,269 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 12.75 | 425 | 17 | 450 S |
| 8.625 | 4,515 | 11 | 450 S |
| 2 | 10,186 | — | — |
| 4.5 | 10,350 | 7.875 | 1,000 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 12, 1984 | Nov 30, 1978 | — |
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 42-461-31346 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-461-31346 → 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/46131346, documented in the API reference.