WELL · 42-003-47818 · DISTRICT 8
UL Mason East Unit #12LS
Andrews County · Spraberry (Trend Area) field · Producing · Horizontal
UL Mason East Unit #12LS (API 42-003-47818) is a horizontal well in Andrews County operated by Diamondback E&P LLC, completed March 5, 2021 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued May 14, 2018, permitted to 9,435 ft.
Completion filings report 10 formation tops, including Yates, Seven Rivers, Grayburg, San Andres.
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 LLCMay 14, 2018 |
- 9,435
- total depth, ft
- 1
- permits on file
- May 14, 2018
- last permit issued
- Mar 5, 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
- Mar 5, 2021
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
Surface location
32.445094, -102.227628
Permit surface location from the RRC GIS record, in Andrews 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; 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 |
|---|---|---|---|---|---|---|
| 839865-99 | Drill | Diamondback E&P LLC | May 9, 2018 | May 14, 2018 | Jul 13, 2018 | 10,412 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Mar 5, 2021 | UL Mason East Unit O-10-48688 | Spraberry (Trend Area) | Diamondback E&P LLC | Producing | 9,435 |
Formation tops
As filed on W-2/G-1. Subsea from 2,956 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Yates | 3,085 | -129 |
| Seven Rivers | 3,306 | -350 |
| Grayburg | 4,181 | -1,225 |
| San AndresSAN ANDRES - CO2 FLOOD, HIGH FLO | 4,620 | -1,664 |
| Holt | 5,319 | -2,363 |
| Glorieta | 5,414 | -2,458 |
| Clear ForkCLEARFORK | 6,604 | -3,648 |
| Permian (undifferentiated)PERMIAN DETRITAL | — | — |
| Queen | — | — |
| Tubb | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,852 | 17,510 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 1,829 | 16 | 1,460 S |
| 9.625 | 6,979 | 12.25 | 1,770 S |
| 5.5 | 17,630 | 8.5 | 2,755 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 | May 11, 2021 | Apr 22, 2021 | Yes |
| 00 | Sep 10, 2019 | May 23, 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 42-003-47818 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-003-47818 → 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 neighbors, subsea-aligned so they line up regardless of surface terrain.
UL Mason East A42-003-47814
0.0 KM · Diamondback E&P LLC · Section with this well →
| Yates | 3,079 | -122 |
| Seven Rivers | 3,305 | -348 |
| Grayburg | 4,172 | -1,215 |
| San Andres | 4,611 | -1,654 |
| Holt | 5,304 | -2,347 |
| Glorieta | 5,404 | -2,447 |
| Clear Fork | 6,584 | -3,627 |
| Fusselman | — |
13 TOPS · FIRST 8
UL Mason East C42-003-47815
0.0 KM · Diamondback E&P LLC · Section with this well →
| Yates | 3,086 | -129 |
| Seven Rivers | 3,314 | -357 |
| Grayburg | 4,180 | -1,223 |
| San Andres | 4,623 | -1,666 |
| Holt | 5,318 | -2,361 |
| Glorieta | 5,415 | -2,458 |
| Clear Fork | 6,591 | -3,634 |
| Permian (undifferentiated) | — |
10 TOPS · FIRST 8
UL Mason East B42-003-47817
0.0 KM · Diamondback E&P LLC · Section with this well →
| Yates | 3,083 | -126 |
| Seven Rivers | 3,315 | -358 |
| Grayburg | 4,178 | -1,221 |
| San Andres | 4,625 | -1,668 |
| Holt | 5,290 | -2,333 |
| Glorieta | 5,402 | -2,445 |
| Clear Fork | 6,587 | -3,630 |
| Queen | — |
10 TOPS · FIRST 8
UL Monty East 46-32 F42-003-49211
0.8 KM · Diamondback E&P LLC · Section with this well →
| Yates | 3,073 | -121 |
| Grayburg | 4,153 | -1,201 |
| Clear Fork | 6,549 | -3,597 |
| Tubb | — | |
| Glorieta | — | |
| Holt | — | |
| Permian (undifferentiated) | — | |
| Queen | — |
10 TOPS · FIRST 8
UL Monty East 46-32 H42-003-49216
0.8 KM · Diamondback E&P LLC · Section with this well →
| Rustler | 2,114 | 838 |
| Yates | 3,074 | -122 |
| Grayburg | 4,155 | -1,203 |
| San Andres | 4,614 | -1,662 |
| Clear Fork | 6,549 | -3,597 |
| Seven Rivers | — | |
| Queen | — | |
| Holt | — |
10 TOPS · FIRST 8
UL Monty East 46-32 C42-003-49214
0.8 KM · Diamondback E&P LLC · Section with this well →
| Rustler | 2,138 | 814 |
| Yates | 3,077 | -125 |
| Grayburg | 4,163 | -1,211 |
| San Andres | 4,626 | -1,674 |
| Clear Fork | 6,568 | -3,616 |
| Glorieta | — | |
| Holt | — | |
| Queen | — |
10 TOPS · FIRST 8
UL Monty East 46-32 E42-003-49213
0.8 KM · Diamondback E&P LLC · Section with this well →
| Yates | 3,077 | -125 |
| Grayburg | 4,162 | -1,210 |
| San Andres | 4,625 | -1,673 |
| Clear Fork | 6,561 | -3,609 |
| Glorieta | — | |
| Tubb | — | |
| Permian (undifferentiated) | — | |
| Holt | — |
10 TOPS · FIRST 8
UL Monty East 46-32 G42-003-49209
0.8 KM · Diamondback E&P LLC · Section with this well →
| Yates | 3,073 | -121 |
| Grayburg | 4,150 | -1,198 |
| Clear Fork | 6,551 | -3,599 |
| Permian (undifferentiated) | — | |
| Queen | — | |
| San Andres | — | |
| Seven Rivers | — | |
| Tubb | — |
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/00347818, documented in the API reference.