WELL · 42-495-34040 · DISTRICT 8
UL 21 Yellowtail #3H
Winkler County · Phantom (Wolfcamp) field · Horizontal
UL 21 Yellowtail #3H (API 42-495-34040) is a horizontal well in Winkler County operated by Apache Corporation, completed October 9, 2018.
The RRC has issued one drilling permit (amended once), issued January 25, 2018, permitted to 12,500 ft.
It was permitted by Percussion Petroleum Oper II,LLC and has since transferred to Apache Corporation on the wellbore schedule.
Completion filings report 13 formation tops, including Rustler, Lamar, Avalon, Bone Spring.
Its 2 leases have reported 1.62M barrels of oil and 1.72M mcf of gas since April 2017, last reporting in July 2026. The leases carry 4 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Percussion Petroleum Oper Ii,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 | Forge Energy, LLCJan 25, 2018 |
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
- 2
- permits on file
- Jan 25, 2018
- last permit issued
- Oct 9, 2018
- completed
- 1.62M
- cumulative oil, bbl
- 1.72M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Apr 2017 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Oct 9, 2018
- Shut in
- —
- Plugged
- —
Surface location
31.714701, -103.234434
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 4 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| UL 21 Yellowtail O-10-49015 | Phantom (Wolfcamp) | Apache Corporation | 3 | 1.45M | 1.53M | Apr 2017 – Jul 2026 |
| UL Yellowtail C 21-29-17 TB O-10-56750 | Phantom (Wolfcamp) | Apache Corporation | 1 | 168K | 188K | Feb 2022 – Jul 2026 |
Oil, barrels lease total
Last 12 months 80,757 · prior 12 29,934(+170%)
Gas, mcf lease total
Last 12 months 99,987 · prior 12 40,088(+149%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Forge Energy, LLCApr 2017 → Jan 2018
- 2Oasis Petroleum Permian LLCFeb 2018 → Feb 2021
- 3Percussion Petroleum Oper Ii,llcMar 2021 → Jul 2023
- 4Callon Permian II, LLCAug 2023 → Jul 2024
- 5Apache CorporationAug 2024 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 835055-98 | Drill | Percussion Petroleum Oper Ii,llc | Feb 8, 2022 | Jan 25, 2018 | Mar 30, 2018 | 12,500 |
| 835055-99 | Drill | Forge Energy, LLC | Jan 11, 2018 | Jan 25, 2018 | Mar 30, 2018 | 12,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-49015 | — | — | — | — |
| — | — O-10-56750 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,767 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| RustlerRUSTLER - POSSIBLE FLOW; POSSIBL | 725 | 2,042 |
| Lamar | 5,085 | -2,318 |
| Avalon | 8,550 | -5,783 |
| Bone SpringBONE SPRING 1 CARBONATE | 8,772 | -6,005 |
| Bone SpringBONE SPRING 2 | 10,554 | -7,787 |
| Bone SpringBONE SPRING 3 CARBONATE | 10,632 | -7,865 |
| Bone SpringBONE SPRING 3 LOWER SHALE | 11,291 | -8,524 |
| Bone SpringBONE SPRING 3 SAND | 11,475 | -8,708 |
| Bone SpringBONE SPRING 3 THREE FINGER SAND | 11,668 | -8,901 |
| WolfcampWOLFCAMP A SHALE TOP | 11,873 | -9,106 |
| Colby-Queen | — | — |
| Devonian | — | — |
| Ellenburger | — | — |
| Fusselman | — | — |
| Mississippian | — | — |
| Pennsylvanian | — | — |
| Silurian (undifferentiated)SILURIAN | — | — |
| Yates | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 12,311 | 22,397 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 785 | 17.5 | 665 S |
| 9.625 | 5,114 | 12.25 | 1,320 S |
| 7 | 12,242 | 8.75 | 1,010 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 | Mar 17, 2022 | Feb 4, 2022 | Yes |
| 00 | Jun 13, 2019 | Feb 12, 2019 | 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 42-495-34040 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-495-34040 → 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 Yellowtail B 21-29-17 TB42-495-33952
0.0 KM · Percussion Petroleum Oper Ii,llc · Section with this well →
| Rustler | 748 | 2,019 |
| Colby-Queen | 5,091 | -2,324 |
| Lamar | 5,091 | -2,324 |
| Holt | — | |
| Queen | — | |
| San Andres | — | |
| Wichita-Albany | — | |
| Yates | — |
11 TOPS · FIRST 8
UL Yellowtail L 21-29-17 TB42-495-34702
0.3 KM · Percussion Petroleum Oper Ii,llc · Section with this well →
| Delaware | 5,125 | -2,358 |
| Yates | — | |
| Seven Rivers | — | |
| San Andres | — | |
| Rustler | — | |
| Holt | — | |
| Glorieta | — | |
| Colby / Queen | — |
10 TOPS · FIRST 8
UL Yellowtail K 21-29-17 WB42-495-34701
0.3 KM · Percussion Petroleum Oper Ii,llc · Section with this well →
| Delaware | 5,114 | -2,347 |
| Bone Spring | 10,066 | -7,299 |
| Bone Spring | 10,782 | -8,015 |
| Yates | — | |
| Capitan | — | |
| Colby / Queen | — | |
| Glorieta | — | |
| Rustler | — |
10 TOPS · FIRST 8
UL Yellowtail J 21-29-17 TB42-495-34700
0.3 KM · Percussion Petroleum Oper Ii,llc · Section with this well →
| Delaware | 5,114 | -2,346 |
| Bone Spring | 10,067 | -7,299 |
| Bone Spring | 10,825 | -8,057 |
| San Andres | — | |
| Rustler | — | |
| Glorieta | — | |
| Seven Rivers | — | |
| Colby / Queen | — |
10 TOPS · FIRST 8
UL Yellowtail I 21-29-17 WA42-495-34699
0.3 KM · Percussion Petroleum Oper Ii,llc · Section with this well →
| Delaware | 5,116 | -2,349 |
| Clear Fork | — | |
| Colby / Queen | — | |
| Glorieta | — | |
| Capitan | — | |
| Yates | — | |
| Holt | — | |
| Rustler | — |
10 TOPS · FIRST 8
UL Yellowtail West H 21-29-17 WB42-495-34698
1.0 KM · Percussion Petroleum Oper Ii,llc · Section with this well →
| Delaware | 5,111 | -2,348 |
| Bone Spring | 10,069 | -7,306 |
| Bone Spring | 10,820 | -8,057 |
| Yates | — | |
| San Andres | — | |
| Rustler | — | |
| Glorieta | — | |
| Colby / Queen | — |
10 TOPS · FIRST 8
UL Yellowtail West G 21-29-17 WA42-495-34697
1.0 KM · Percussion Petroleum Oper Ii,llc · Section with this well →
| Delaware | 5,101 | -2,337 |
| Yates | — | |
| Colby / Queen | — | |
| Clear Fork | — | |
| Capitan | — | |
| Glorieta | — | |
| Holt | — | |
| Rustler | — |
10 TOPS · FIRST 8
UL Yellowtail West E 21-29-17 WB42-495-34695
1.0 KM · Percussion Petroleum Oper Ii,llc · Section with this well →
| Delaware | 5,109 | -2,346 |
| Seven Rivers | — | |
| San Andres | — | |
| Glorieta | — | |
| Rustler | — | |
| Colby / Queen | — | |
| Clear Fork | — | |
| Capitan | — |
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/49534040, documented in the API reference.