WELL · 42-317-37687 · DISTRICT 8
Cox #1
Martin County · Spraberry (Trend Area) field · NO Production · Vertical
Cox #1 (API 42-317-37687) is a well in Martin County operated by Rock Fish Operating LLC, completed April 11, 2018 and listed as no production on the RRC schedule.
The RRC has issued one drilling permit, issued April 16, 2012, permitted to 11,000 ft.
It was permitted by Piedra Operating, LLC and has since transferred to Rock Fish Operating LLC on the wellbore schedule.
Completion filings report 4 formation tops, including Spraberry, Wolfcamp, Mississipian, Mississippian.
Its lease has reported 40K barrels of oil and 57.3K mcf of gas since August 2012, last reporting in July 2026.
Operator of record
Permitted by Piedra Operating, LLC; the EWA schedule now lists a different operator.
- Based in
- McKinney, TX
- P-5 status
- Active (A)
- P-5 last filed
- Jun 4, 2026
- Permits on file
- 10
- Phone
- (432) 201-2837
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Rock Fish Operating LLC |
| Production reports | Rock Fish Operating LLCthrough Apr 2026 |
| Latest permit | Piedra Operating, LLCApr 16, 2012 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 11,000
- total depth, ft
- 1
- permits on file
- Apr 16, 2012
- last permit issued
- Apr 11, 2018
- completed
- 40K
- cumulative oil, bbl
- 57.3K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Aug 2012 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Apr 11, 2018
- Shut in
- —
- 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; this well is the only one on it.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Cox O-10-43078 | Spraberry (Trend Area) | Rock Fish Operating LLC | 1 | 40K | 57.3K | Aug 2012 – Jul 2026 |
Oil, barrels lease total
Last 12 months 3 · prior 12 1(+200%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Piedra Operating, LLCAug 2012 → Mar 2014
- 2Athlon Holdings LPApr 2014 → Jan 2015
- 3Encana Oil & Gas(usa) Inc.Feb 2015 → May 2018
- 4Parsley Energy Operations, LLCJun 2018 → May 2020
- 5Bam Permian Operating, LLCJun 2020 → Feb 2021
- 6Hexp Operating, LLCMar 2021 → Sep 2022
- 7Flat Top Operating, LLCOct 2022 → May 2024
- 8Rock Fish Operating LLCApr 2026 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 737278-99 | Drill | Piedra Operating, LLC | Mar 30, 2012 | Apr 16, 2012 | Jun 26, 2012 | 11,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-43078 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,583 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Spraberry | 6,805 | -4,222 |
| Wolfcamp | 8,247 | -5,664 |
| Mississipian | 10,424 | -7,841 |
| Mississippian | 10,424 | -7,841 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,672 | 10,110 | Perforated |
| 10,457 | 10,614 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 235 | 17.5 | 300 S |
| 8.625 | 4,525 | 11 | 1,025 S |
| 5.5 | 10,878 | 7.875 | 1,150 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 10, 2018 | May 31, 2018 | — |
| 00 | Dec 11, 2017 | Dec 11, 2017 | — |
| 00 | Sep 11, 2013 | Oct 10, 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 42-317-37687 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-317-37687 → 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/31737687, documented in the API reference.