TEXAS · WELLS · MARTIN COUNTY · COX "9" LEASE · API 42-317-37020 · DISTRICT 7B
Cox 9 #4
Martin County · Spraberry (Trend Area) field · Shut In · Vertical
Cox 9 #4 (API 42-317-37020) is a well in Martin County operated by Diamondback E&P LLC, completed December 16, 2011 and listed as shut in on the RRC schedule, shut in May 1, 2025.
The RRC has issued 2 drilling permits between 2008 and 2011, permitted to 11,186 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 2 formation tops, including Spraberry, Strawn.
Its lease has reported 236K barrels of oil and 329K mcf of gas since April 2000, last reporting in July 2026. The lease carries 4 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
- 5,243
- 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 Jan 2025 |
| Latest permit | Endeavor Energy Resources L.P.Jul 15, 2011 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 11,186
- total depth, ft
- 2
- permits on file
- Jul 15, 2011
- last permit issued
- Dec 16, 2011
- completed
- 236K
- cumulative oil, bbl
- 329K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Apr 2000 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Dec 16, 2011
- Shut in
- May 1, 2025
- 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 |
|---|---|---|---|---|---|---|
| Cox "9" O-10-36430 | Spraberry (Trend Area) | Diamondback E&P LLC | 4 | 236K | 329K | Apr 2000 – Jul 2026 |
Oil, barrels lease total
Last 12 months 0 · prior 12 1,478(-100%)
Gas, mcf lease total
Last 12 months 0 · prior 12 2,381(-100%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Endeavor Energy Resources L.P.Apr 2000 → Dec 2024
- 2Diamondback E&P LLCJan 2025 → Jan 2025
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 720117-99 | Drill | Endeavor Energy Resources L.P. | Jul 13, 2011 | Jul 15, 2011 | Aug 12, 2011 | 12,000 |
| 656735-99 | Drill | Endeavor Energy Resources L.P. | Mar 5, 2008 | Apr 28, 2008 | — | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Dec 16, 2011 | Cox 9 O-10-36430 | Spraberry (Trend Area) | Diamondback E&P LLC | Shut In · shut in May 1, 2025 | 11,186 |
Formation tops
As filed on W-2/G-1. Subsea from 2,840 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,733 | 11,064 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 12.75 | 376 | 17.5 | 445 S |
| 8.625 | 5,129 | 11 | 520 S |
| 5.5 | 11,186 | 7.875 | 1,135 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 | Nov 16, 2012 | Jan 11, 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 42-317-37020 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-317-37020 → 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/31737020, documented in the API reference.