WELL · 42-495-34510 · DISTRICT 8
UL Mill 3427-21 D #4H
Winkler County · Phantom (Wolfcamp) field · Horizontal
UL Mill 3427-21 D #4H (API 42-495-34510) is a horizontal well in Winkler County operated by Wpx Energy Permian LLC, completed February 5, 2021.
The RRC has issued one drilling permit (amended once), issued March 9, 2020, permitted to 14,000 ft.
Completion filings report 11 formation tops, including Capitan, Clear Fork, Colby / Queen, Delaware.
Its 2 leases have reported 4.11M barrels of oil and 5.55M mcf of gas since August 2018, last reporting in July 2026. The leases carry 11 wells, so these are lease totals, not this well alone.
Operator of record
Oklahoma City, OK · P-5 Y, filed Sep 4, 2025 · 956 permits on file · (800) 465-8314
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | WPX Energy Permian LLC |
| Production reports | WPX Energy Permian, LLCthrough Mar 2026 |
| Latest permit | Felix Energy Holdings II, LLCMar 9, 2020 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 14,000
- total depth, ft
- 2
- permits on file
- Mar 9, 2020
- last permit issued
- Feb 5, 2021
- completed
- 4.11M
- cumulative oil, bbl
- 5.55M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Aug 2018 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Feb 5, 2021
- Shut in
- —
- Plugged
- —
Surface location
31.695551, -103.200061
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 2 leases this well is completed on; they carry 11 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| UL Mill 3427-21 O-10-51872 | Phantom (Wolfcamp) | WPX Energy Permian, LLC | 10 | 4.09M | 5.52M | Aug 2018 – Jul 2026 |
| UL Mill 3427-21 D O-10-54749 | Phantom (Wolfcamp) | WPX Energy Permian, LLC | 1 | 13.6K | 25.6K | Aug 2020 – Sep 2021 |
Oil, barrels lease total
Last 12 months 237,631 · prior 12 316,782(-25%)
Gas, mcf lease total
Last 12 months 325,985 · prior 12 444,735(-27%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Felix Energy Holdings II, LLCAug 2018 → Apr 2020
- 2WPX Energy Permian, LLCMay 2020 → Mar 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 862547-98 | Drill | WPX Energy Permian, LLC | Apr 21, 2020 | Mar 9, 2020 | Jun 13, 2020 | 14,000 |
| 862547-99 | Drill | Felix Energy Holdings II, LLC | Mar 5, 2020 | Mar 9, 2020 | — | 14,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-51872 | — | — | — | — |
| — | — O-10-54749 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,774 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| CapitanCAPITAN REEF - HIGH FLOWS | — | — |
| Clear ForkCLEARFORK | — | — |
| Colby / Queen | — | — |
| Delaware | — | — |
| Glorieta | — | — |
| Holt | — | — |
| Precambrian (Undifferentiated) | — | — |
| RustlerRUSTLER - POSSIBLE FLOW; POSSIBL | — | — |
| San AndresSAN ANDRES - HIGH FLOWS, H2S, CO | — | — |
| Seven RiversSEVEN RIVERS / QUEEN | — | — |
| Yates | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,880 | 21,958 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 1,595 | 17.5 | 1,370 S |
| 10.75 | 5,044 | 12.25 | 935 S |
| 7.625 | 11,100 | 9.875 | 935 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 26, 2021 | Jun 27, 2021 | Yes |
| 00 | Feb 19, 2021 | Feb 11, 2021 | — |
| 00 | Oct 8, 2020 | Oct 1, 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 42-495-34510 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-495-34510 → 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 Mill 3427-21 E42-495-34508
0.0 KM · WPX Energy Permian, LLC · Section with this well →
| San Andres | — | |
| Seven Rivers | — | |
| Yates | — | |
| Capitan | — | |
| Clear Fork | — | |
| Colby / Queen | — | |
| Delaware | — | |
| Glorieta | — |
10 TOPS · FIRST 8
UL Mill 3427-21 F42-495-34511
0.0 KM · WPX Energy Permian, LLC · Section with this well →
| Capitan | — | |
| Yates | — | |
| Seven Rivers | — | |
| San Andres | — | |
| Rustler | — | |
| Holt | — | |
| Glorieta | — | |
| Delaware | — |
10 TOPS · FIRST 8
UL Mill 3427-21 G42-495-34512
0.2 KM · WPX Energy Permian, LLC · Section with this well →
| Clear Fork | — | |
| Yates | — | |
| Seven Rivers | — | |
| San Andres | — | |
| Rustler | — | |
| Holt | — | |
| Glorieta | — | |
| Delaware | — |
10 TOPS · FIRST 8
UL Mill 3427-21 H42-495-34509
0.2 KM · WPX Energy Permian, LLC · Section with this well →
| Rustler | — | |
| Yates | — | |
| Seven Rivers | — | |
| Capitan | — | |
| Clear Fork | — | |
| Colby / Queen | — | |
| Delaware | — | |
| Glorieta | — |
10 TOPS · FIRST 8
UL Mill 3427-21 I42-495-34513
0.2 KM · WPX Energy Permian, LLC · Section with this well →
| Yates | — | |
| Capitan | — | |
| Clear Fork | — | |
| Colby / Queen | — | |
| Delaware | — | |
| Glorieta | — | |
| Holt | — | |
| Rustler | — |
10 TOPS · FIRST 8
UL Mill 3427-2142-495-34076
0.4 KM · Felix Energy Holdings II, LLC · Section with this well →
| Delaware | 4,992 | -2,240 |
| Clear Fork | — | |
| Yates | — | |
| Wichita-Albany | — | |
| San Andres | — | |
| Rustler | — | |
| Queen | — | |
| Holt | — |
10 TOPS · FIRST 8
UL Mill 3427-2142-495-33938
0.4 KM · WPX Energy Permian, LLC · Section with this well →
| Cherry Canyon | 6,225 | -3,473 |
| Bone Spring | 8,352 | -5,600 |
| Wolfcamp | 11,102 | -8,350 |
UL Mill 3427-2142-495-33937
0.4 KM · Felix Energy Holdings II, LLC · Section with this well →
| Delaware | 4,992 | -2,240 |
| Wichita-Albany | — | |
| San Andres | — | |
| Rustler | — | |
| Queen | — | |
| Glorieta | — | |
| Holt | — | |
| Colby-Queen | — |
10 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/49534510, documented in the API reference.