WELL · 42-003-47369 · DISTRICT 8
UL Mason East Unit #4LS
Andrews County · Spraberry (Trend Area) field · Producing · Horizontal
UL Mason East Unit #4LS (API 42-003-47369) is a horizontal well in Andrews County operated by Diamondback E&P LLC, completed June 22, 2021 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued June 15, 2016, permitted to 9,440 ft.
Completion filings report 20 formation tops, including Yates, Seven Rivers, Queen, Grayburg.
Its lease has reported 2.15M barrels of oil and 3.06M mcf of gas since March 2017, last reporting in July 2026. The lease carries 4 wells, so these are lease totals, not this well alone.
Operator of record
- Based in
- Midland, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- May 4, 2026
- Permits on file
- 5,237
- Phone
- (432) 221-7400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Diamondback E&P LLC |
| Production reports | Diamondback E&P LLCthrough Apr 2026 |
| Latest permit | Diamondback E&P LLCJun 15, 2016 |
- 9,440
- total depth, ft
- 1
- permits on file
- Jun 15, 2016
- last permit issued
- Jun 22, 2021
- completed
- 2.15M
- cumulative oil, bbl
- 3.06M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Mar 2017 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jun 22, 2021
- 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 4 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| UL Mason East Unit O-10-48688 | Spraberry (Trend Area) | Diamondback E&P LLC | 4 | 2.15M | 3.06M | Mar 2017 – Jul 2026 |
Oil, barrels lease total
Last 12 months 76,685 · prior 12 93,889(-18%)
Gas, mcf lease total
Last 12 months 291,406 · prior 12 293,983(-1%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Diamondback E&P LLCMar 2017 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 816232-99 | Drill | Diamondback E&P LLC | Jun 10, 2016 | Jun 15, 2016 | Aug 4, 2016 | 10,485 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jun 22, 2021 | UL Mason East Unit O-10-48688 | Spraberry (Trend Area) | Diamondback E&P LLC | Producing | 9,440 |
Formation tops
As filed on W-2/G-1. Subsea from 2,952 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Yates | 3,070 | -118 |
| Seven Rivers | 3,313 | -361 |
| Queen | 3,742 | -790 |
| Grayburg | 4,151 | -1,199 |
| San AndresSAN ANDRES - CO2 FLOOD, HIGH FLO | 4,589 | -1,637 |
| Glorieta | 5,406 | -2,454 |
| Clear ForkCLEARFORK | 6,574 | -3,622 |
| Spraberry | 8,391 | -5,439 |
| Tubb | 8,391 | -5,439 |
| Wichita-AlbanyWICHITA ALBANY | 8,932 | -5,980 |
| Canyon | — | — |
| Dean | — | — |
| Devonian | — | — |
| Fusselman | — | — |
| Holt | — | — |
| McKee | — | — |
| Pennsylvanian | — | — |
| Permian (undifferentiated)PERMIAN DETRITAL | — | — |
| Strawn | — | — |
| Wolfcamp | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 10,334 | 20,540 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 1,885 | 17.5 | 1,715 S |
| 9.625 | 6,028 | 12.25 | 1,110 S |
| 5.5 | 20,655 | 8.5 | 2,885 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 | Aug 19, 2021 | Aug 9, 2021 | — |
| 00 | Oct 11, 2017 | Jul 18, 2017 | Yes |
| 00 | Aug 11, 2017 | May 11, 2017 | 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 42-003-47369 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-003-47369 → 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/00347369, documented in the API reference.