WELL · 42-317-37356 · DISTRICT 8
Cox 12A #2
Martin County · Spraberry (Trend Area) field · Shut IN · Vertical
Cox 12a #2 (API 42-317-37356) is a well in Martin County operated by Diamondback E&P LLC, completed April 5, 2012 and listed as shut in on the RRC schedule, shut in April 1, 2026.
The RRC has issued 2 drilling permits between 2011 and 2012, permitted to 11,535 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 3 formation tops, including Spraberry, Strawn, Atoka.
Its lease has reported 250K barrels of oil and 474K mcf of gas since January 2000, last reporting in July 2026. The lease carries 7 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.
- 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 | none |
| Production reports | Diamondback E&P LLCthrough Apr 2026 |
| Latest permit | Endeavor Energy Resources L.P.Oct 1, 2012 |
- 11,535
- total depth, ft
- 2
- permits on file
- Oct 1, 2012
- last permit issued
- Apr 5, 2012
- completed
- 250K
- cumulative oil, bbl
- 474K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 2000 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Apr 5, 2012
- Shut in
- Apr 1, 2026
- 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 7 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Cox "12A" O-10-41447 | Spraberry (Trend Area) | Diamondback E&P LLC | 7 | 250K | 474K | Jan 2000 – Jul 2026 |
Oil, barrels lease total
Last 12 months 1,483 · prior 12 2,210(-33%)
Gas, mcf lease total
Last 12 months 5,462 · prior 12 2,341(+133%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Endeavor Energy Resources L.P.Jan 2000 → Dec 2024
- 2Diamondback E&P LLCMar 2025 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 748099-99 | Recompletion | Endeavor Energy Resources L.P. | Sep 12, 2012 | Oct 1, 2012 | Nov 29, 2011 | 11,354 |
| 728743-99 | Drill | Endeavor Energy Resources L.P. | Nov 21, 2011 | Nov 22, 2011 | Nov 29, 2011 | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Apr 5, 2012 | Cox 12A O-10-41447 | Spraberry (Trend Area) | Diamondback E&P LLC | Shut IN · shut in Apr 1, 2026 | 11,535 |
Formation tops
As filed on W-2/G-1. Subsea from 2,825 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,630 | 11,354 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 12.75 | 408 | 17.5 | 465 S |
| 8.625 | 5,162 | 11 | 520 S |
| 5.5 | 11,535 | 7.875 | 1,215 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 18, 2013 | Jul 18, 2012 | 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 42-317-37356 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-317-37356 → 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/31737356, documented in the API reference.