WELL · 42-317-36635 · DISTRICT 8

Cox '12A' #1

Cox '12a' #1 (API 42-317-36635) is a permitted well in Martin County filed by Endeavor Energy Resources L.P.; no completion report is on file yet.

The RRC has issued 2 drilling permits between 2000 and 2011, permitted to 12,000 ft.

Completion filings report 2 formation tops, including Spraberry, Strawn.

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

Endeavor Energy Resources L.P.

Midland, TX · P-5 Y, filed Apr 4, 2026 · 6,190 permits on file · (855) 247-5920

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.Feb 14, 2011

12,000: total depth, ft
2: permits on file
Feb 14, 2011: last permit issued
—: 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: OFF SCHEDULE
Completed: —
Shut in: —
Plugged: —

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
710052-99	Drill	Endeavor Energy Resources L.P.	Feb 10, 2011	Feb 14, 2011	Mar 5, 2011	12,000
494225-99	Drill	Stephens, Autry C.	Apr 18, 2000	May 18, 2000	—	11,000

Completions

Completed	Lease	Field	Operator	Status	Depth
—	— O-10-41447	—	—	—	—

Formation tops

As filed on W-2/G-1. Subsea from 2,829 ft elevation.Download CSV →

Formation	MD ft	Subsea
SpraberrySPRABERRY (TREND AREA)	7,775	-4,946
Strawn	10,800	-7,971

Perforations

Perforated and open-hole intervals.

From	To	Type
8,651	11,070	Perforated

Casing

Strings as reported, shallowest first.

Casing in	Set at	Hole in	Cement
12.75	347	17.5	430 S
8.625	5,128	11	575 S
5.5	11,193	7.875	1,385 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 29, 2012	Jul 18, 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 42-317-36635 → W-2, G-1, plugging reports, as PDFs
Completion packets for 42-317-36635 → 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/31736635, documented in the API reference.