WELL · 42-317-35197 · DISTRICT 8
Knox #4
Martin County · Spraberry (Trend Area) field · Vertical
Knox #4 (API 42-317-35197) is a well in Martin County operated by Diamondback E&P LLC, completed July 18, 2008.
The RRC has issued 2 drilling permits between 2008 and 2016, 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 5 formation tops, including Clearforklime, Spraberry, Dean, Wolfcamp.
Its 2 leases have reported 251K barrels of oil and 236K mcf of gas since June 2005, last reporting in July 2026. The leases carry 9 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 X, filed May 4, 2026 · 5,237 permits on file · (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 Apr 2026 |
| Latest permit | Endeavor Energy Resources L.P.Jun 13, 2016 |
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
- 2
- permits on file
- Jun 13, 2016
- last permit issued
- Jul 18, 2008
- completed
- 251K
- cumulative oil, bbl
- 236K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jun 2005 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jul 18, 2008
- 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 2 leases this well is completed on; they carry 9 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Knox "A" O-10-39698 | Spraberry (Trend Area) | Diamondback E&P LLC | 4 | 166K | 158K | Oct 2009 – Jul 2026 |
| Knox O-10-37546 | Spraberry (Trend Area) | Diamondback E&P LLC | 5 | 85.2K | 77.8K | Jun 2005 – Jul 2021 |
Oil, barrels lease total
Last 12 months 4,712 · prior 12 3,976(+19%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Terrace Petroleum CorporationJun 2005 → Sep 2005
- 2LCX Energy, LLCOct 2005 → Sep 2009
- 3Endeavor Energy Resources L.P.Oct 2009 → Sep 2016
- 4Guidon Energy Mgmt Services LLCOct 2016 → Dec 2020
- 5Diamondback E&P LLCJan 2021 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 816208-99 | Recompletion | Endeavor Energy Resources L.P. | Jun 9, 2016 | Jun 13, 2016 | — | 11,136 |
| 655575-99 | Drill | LCX Energy, LLC | Feb 19, 2008 | Feb 26, 2008 | Apr 2, 2008 | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-37546 | — | — | — | — |
| — | — O-10-39698 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,898 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,904 | 10,728 | Perforated |
| 7,904 | 10,976 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 412 | 17.5 | 400 S |
| 8.625 | 5,002 | 11 | 700 S |
| 4.5 | 11,136 | 7.875 | 1,600 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 8, 2016 | Jun 30, 2016 | — |
| 00 | Feb 2, 2010 | Jan 22, 2009 | Yes |
| 00 | Mar 16, 2009 | Jan 22, 2009 | Yes |
| 00 | Mar 2, 2009 | — | — |
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 42-317-35197 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-317-35197 → 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/31735197, documented in the API reference.