WELL · 42-495-34305 · DISTRICT 8
UL Bighorn J 21-30-19 #4210H
Winkler County · Phantom (Wolfcamp) field · Producing · Horizontal
UL Bighorn J 21-30-19 #4210H (API 42-495-34305) is a horizontal well in Winkler County operated by Apache Corporation, completed March 28, 2021 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued January 31, 2019, permitted to 12,500 ft.
It was permitted by Oasis Petroleum Permian LLC and has since transferred to Apache Corporation on the wellbore schedule.
Completion filings report 11 formation tops, including Rustler, Bone Spring, Clear Fork, Colby-Queen.
Its lease has reported 267K barrels of oil and 295K mcf of gas since August 2019, last reporting in July 2026.
Operator of record
Permitted by Oasis Petroleum Permian LLC; the EWA schedule now lists a different operator.
Houston, TX · P-5 Y, filed Oct 4, 2025 · 9,754 permits on file · (713) 296-6400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Apache Corporation |
| Production reports | Apache Corporationthrough Apr 2026 |
| Latest permit | Oasis Petroleum Permian LLCJan 31, 2019 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 12,500
- total depth, ft
- 1
- permits on file
- Jan 31, 2019
- last permit issued
- Mar 28, 2021
- completed
- 267K
- cumulative oil, bbl
- 295K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Aug 2019 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Mar 28, 2021
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active
Surface location
31.696720, -103.249880
OpenStreetMap → · Google Maps →
Permit surface location from the RRC GIS record, in Winkler County.
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 |
|---|---|---|---|---|---|---|
| UL Bighorn J 21-30-19 O-10-53664 | Phantom (Wolfcamp) | Apache Corporation | 1 | 267K | 295K | Aug 2019 – Jul 2026 |
Oil, barrels lease total
Last 12 months 16,384 · prior 12 13,945(+17%)
Gas, mcf lease total
Last 12 months 17,586 · prior 12 13,635(+29%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Oasis Petroleum Permian LLCMar 2020 → Feb 2021
- 2Percussion Petroleum Oper Ii,llcMar 2021 → Jul 2023
- 3Callon Permian II, LLCAug 2023 → Jul 2024
- 4Apache CorporationAug 2024 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 849373-99 | Drill | Oasis Petroleum Permian LLC | Jan 29, 2019 | Jan 31, 2019 | Apr 24, 2019 | 12,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-53664 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,768 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| RustlerRUSTLER - POSSIBLE FLOW; POSSIBL | 717 | 2,051 |
| Bone SpringBONE SPRING 1 SHALE | 9,662 | -6,894 |
| Bone SpringBONE SPRING 3 CARBONATE | 10,618 | -7,850 |
| Bone SpringBONE SPRING 3 SHALE | 11,111 | -8,343 |
| Bone SpringBONE SPRING 3 SAND | 11,373 | -8,605 |
| Clear ForkCLEARFORK | — | — |
| Colby-Queen | — | — |
| Delaware | — | — |
| Glorieta | — | — |
| Holt | — | — |
| QueenQUEEN-SEVEN RIVERS | — | — |
| San AndresSAN ANDRES - HIGH FLOWS, H2S, CO | — | — |
| Wichita-AlbanyWICHITA ALBANY | — | — |
| Yates | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,986 | 21,666 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 5,045 | 12.25 | 2,755 S |
| 7.625 | 11,804 | 8.75 | 665 S |
| 5.5 | 22,025 | 6.75 | 1,325 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 | Jun 17, 2021 | Jun 3, 2021 | Yes |
| 00 | Nov 18, 2020 | Nov 2, 2020 | — |
| 00 | Jun 2, 2020 | Feb 27, 2020 | Yes |
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 42-495-34305 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-495-34305 → 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.
UL Bighorn 21-30-19 K42-495-34306
0.0 KM · Oasis Petroleum Permian LLC · Section with this well →
| Lamar | 5,021 | -2,253 |
| Avalon | 8,550 | -5,782 |
| Bone Spring | 9,656 | -6,888 |
| Bone Spring | 10,414 | -7,646 |
| Bone Spring | 10,594 | -7,826 |
| Bone Spring | 11,058 | -8,290 |
| Glorieta | — | |
| Colby-Queen | — |
15 TOPS · FIRST 8
UL Bighorn 21-30-19 I42-495-34304
0.0 KM · Oasis Petroleum Permian LLC · Section with this well →
| Bone Spring | 9,613 | -6,845 |
| Bone Spring | 10,253 | -7,485 |
| Bone Spring | 10,394 | -7,626 |
| Bone Spring | 10,394 | -7,626 |
| Bone Spring | 11,157 | -8,389 |
| Bone Spring | 11,362 | -8,594 |
| Delaware | — | |
| Clear Fork | — |
16 TOPS · FIRST 8
UL Bighorn M 21-30-1942-495-34344
0.0 KM · Oasis Petroleum Permian LLC · Section with this well →
| Rustler | 720 | 2,048 |
| Delaware | 5,034 | -2,266 |
| Clear Fork | — | |
| Holt | — | |
| Yates | — | |
| Wichita-Albany | — | |
| San Andres | — | |
| Queen | — |
10 TOPS · FIRST 8
UL 21 Bighorn D 21-31-1942-495-34008
0.5 KM · Oasis Petroleum Permian LLC · Section with this well →
| Rustler | 704 | 2,062 |
| Salado | 1,083 | 1,683 |
| Castile | 3,041 | -275 |
| Bell Canyon | 5,097 | -2,331 |
| Yates | — | |
| Queen | — | |
| Holt | — | |
| Delaware | — |
10 TOPS · FIRST 8
UL Bighorn O 21-30-1942-495-34348
0.8 KM · Oasis Petroleum Permian LLC · Section with this well →
| Delaware | 5,024 | -2,251 |
| Brushy Canyon | 7,382 | -4,609 |
| Queen | — | |
| Colby-Queen | — | |
| Glorieta | — | |
| Holt | — | |
| Clear Fork | — | |
| Rustler | — |
11 TOPS · FIRST 8
UL Bighorn C 21-30-1942-495-34257
0.8 KM · Oasis Petroleum Permian LLC · Section with this well →
| Delaware | 5,023 | -2,250 |
| Colby-Queen | — | |
| Holt | — | |
| Queen | — | |
| Rustler | — | |
| San Andres | — | |
| Wichita-Albany | — | |
| Yates | — |
10 TOPS · FIRST 8
UL Bighorn B 21-30-1942-495-34258
0.8 KM · Oasis Petroleum Permian LLC · Section with this well →
| Rustler | 708 | 2,065 |
| Yates | — | |
| Wichita-Albany | — | |
| San Andres | — | |
| Queen | — | |
| Holt | — | |
| Glorieta | — | |
| Delaware | — |
10 TOPS · FIRST 8
UL Bighorn N 21-30-1942-495-34345
0.8 KM · Oasis Petroleum Permian LLC · Section with this well →
| Delaware | 5,024 | -2,251 |
| Bone Spring | 9,648 | -6,875 |
| Bone Spring | 10,336 | -7,563 |
| Bone Spring | 10,360 | -7,587 |
| Bone Spring | 10,877 | -8,104 |
| Bone Spring | 11,133 | -8,360 |
| Clear Fork | — | |
| Holt | — |
15 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/49534305, documented in the API reference.