WELL · 42-317-35567 · DISTRICT 8
Mullins 12A #1
Martin County · Spraberry (Trend Area) field · Producing · Vertical
Mullins 12a #1 (API 42-317-35567) is a well in Martin County operated by Diamondback E&P LLC, completed March 16, 2011 and listed as producing on the RRC schedule.
The RRC has issued 2 drilling permits (amended once) between 2009 and 2017, permitted to 12,000 ft.
It was permitted by Endeavor Energy Resources L.P. and has since transferred to Diamondback E&P LLC on the wellbore schedule.
Completion filings report 4 formation tops, including Spraberry, Strawn, Mississippian, Atoka.
Its lease has reported 79.3K barrels of oil and 48.1K mcf of gas since March 2011, last reporting in July 2026. The lease carries 2 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Endeavor Energy Resources L.P.; the EWA schedule now lists a different operator.
Midland, TX · P-5 Y, filed Mar 4, 2026 · 5,231 permits on file · (855) 247-5920
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Diamondback E&P LLC |
| Production reports | Diamondback E&P LLCthrough Jan 2026 |
| Latest permit | Endeavor Energy Resources L.P.Nov 29, 2017 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 12,000
- total depth, ft
- 3
- permits on file
- Nov 29, 2017
- last permit issued
- Mar 16, 2011
- completed
- 79.3K
- cumulative oil, bbl
- 48.1K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Mar 2011 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Mar 16, 2011
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: X
Surface location
32.514920, -101.799508
OpenStreetMap → · Google Maps →
Permit surface location from the RRC GIS record, in Martin 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 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Mullins "12A" O-10-40948 | Spraberry (Trend Area) | Diamondback E&P LLC | 2 | 79.3K | 48.1K | Mar 2011 – Jul 2026 |
Oil, barrels lease total
Last 12 months 377 · prior 12 1,777(-79%)
Gas, mcf lease total
Last 12 months 7 · prior 12 2,535(-100%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Endeavor Energy Resources L.P.Mar 2011 → Dec 2024
- 2Diamondback E&P LLCJan 2025 → Jul 2025
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 833384-99 | Recompletion | Endeavor Energy Resources L.P. | Nov 17, 2017 | Nov 29, 2017 | — | 11,135 |
| 678206-98 | Drill | Endeavor Energy Resources L.P. | Jun 21, 2010 | Feb 5, 2009 | Oct 21, 2010 | 12,000 |
| 678206-99 | Drill | Endeavor Energy Resources L.P. | Feb 4, 2009 | Feb 5, 2009 | Oct 21, 2010 | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-40948 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,758 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| SpraberrySPRABERRY (TREND AREA) | 7,675 | -4,917 |
| SpraberrySPRAYBERRY (TREND AREA) | 7,675 | -4,917 |
| Strawn | 10,200 | -7,442 |
| Mississippian | 10,425 | -7,667 |
| Atoka | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,979 | 9,883 | Perforated |
| 7,979 | 11,007 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 12.75 | 330 | 17.5 | 400 S |
| 8.625 | 4,331 | 11 | 410 S |
| 5.5 | 11,135 | 7.875 | 1,445 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 | Apr 12, 2018 | Jan 23, 2018 | — |
| 00 | Dec 1, 2011 | Mar 31, 2011 | 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 42-317-35567 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-317-35567 → 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.
Mullins '12'42-317-35314
0.8 KM · Endeavor Energy Resources L.P. · Section with this well →
| Clear Fork | 5,450 | -2,697 |
| Spraberry | 7,150 | -4,397 |
| Dean | 8,525 | -5,772 |
| Wolfcamp | 8,775 | -6,022 |
| Strawn | 10,175 | -7,422 |
| Mississippian | 10,800 | -8,047 |
| Atoka | — |
License TO Drill 11-47 Unit42-317-46581
1.6 KM · Diamondback E&P LLC · Section with this well →
| Yates | 2,259 | 475 |
| Queen | 3,102 | -368 |
| Grayburg | 3,490 | -756 |
| San Andres | 3,799 | -1,065 |
| Clear Fork | 5,131 | -2,397 |
| Spraberry | 7,150 | -4,416 |
| Dean | 8,518 | -5,784 |
| Cisco | — |
10 TOPS · FIRST 8
License TO Drill 11-47 Unit42-317-46582
1.6 KM · Diamondback E&P LLC · Section with this well →
| Yates | 2,257 | 477 |
| Queen | 3,103 | -369 |
| Grayburg | 3,506 | -772 |
| San Andres | 3,814 | -1,080 |
| Clear Fork | 5,160 | -2,426 |
| Spraberry | 7,152 | -4,418 |
| Dean | 8,534 | -5,800 |
| Pennsylvanian | — |
11 TOPS · FIRST 8
License TO Drill West 11-47 Unit42-317-46592
1.6 KM · Diamondback E&P LLC · Section with this well →
| Yates | 2,260 | 474 |
| Queen | 3,115 | -381 |
| Grayburg | 3,511 | -777 |
| San Andres | 3,828 | -1,094 |
| Clear Fork | 5,190 | -2,456 |
| Spraberry | 7,164 | -4,430 |
| Dean | 8,542 | -5,808 |
| Santa Rosa | — |
10 TOPS · FIRST 8
License TO Drill West 11-47 Unit42-317-46593
1.6 KM · Diamondback E&P LLC · Section with this well →
| Yates | 2,262 | 472 |
| Queen | 3,109 | -375 |
| Grayburg | 3,510 | -776 |
| San Andres | 3,818 | -1,084 |
| Clear Fork | 5,227 | -2,493 |
| Spraberry | 7,188 | -4,454 |
| Dean | 8,557 | -5,823 |
| Cisco | — |
10 TOPS · FIRST 8
Central Davis SWD42-317-46271
1.7 KM · Rock Fish Operating LLC · Section with this well →
| Santa Rosa | 880 | 1,852 |
| Yates | 2,277 | 455 |
| Queen | 3,113 | -381 |
| Grayburg | 3,665 | -933 |
| San Andres | 4,121 | -1,389 |
| Cisco | — | |
| Spraberry | — | |
| Pennsylvanian | — |
10 TOPS · FIRST 8
Katherine F42-115-34055
2.1 KM · Hibernia Resources IV, LLC · Section with this well →
| Yates | 2,265 | 520 |
| San Andres | 4,020 | -1,235 |
| Clear Fork | 6,015 | -3,230 |
| Spraberry | 7,150 | -4,365 |
| Dean | 8,509 | -5,724 |
| Wolfcamp | — | |
| Devonian | — | |
| Canyon | — |
10 TOPS · FIRST 8
Katherine C42-115-34052
2.7 KM · Hibernia Resources IV, LLC · Section with this well →
| Yates | 2,252 | 541 |
| San Andres | 4,080 | -1,287 |
| Clear Fork | 5,925 | -3,132 |
| Spraberry | 7,184 | -4,391 |
| Dean | 8,555 | -5,762 |
| Pennsylvanian | — | |
| Silurian (undifferentiated) | — | |
| Wolfcamp | — |
11 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/31735567, documented in the API reference.