WELL · 42-237-39425 · DISTRICT 9
Knox D #4BG
Jack County · Halek (Caddo) field · Producing · Horizontal
Knox D #4BG (API 42-237-39425) is a horizontal well in Jack County operated by Robuck Petroleum LLC, completed December 13, 2011 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued April 26, 2011, permitted to 5,500 ft.
It was permitted by Perpetual Energy LLC and has since transferred to Robuck Petroleum LLC on the wellbore schedule.
Completion filings report 4 formation tops, including Pregnant Shale, Marble Falls, Chester, Barnett.
Its lease has reported 8.46K barrels of oil and 44.6K mcf of gas since December 2011, last reporting in July 2026.
Operator of record
Permitted by Perpetual Energy LLC; the EWA schedule now lists a different operator.
Nacogdoches, TX · P-5 Y, filed Sep 4, 2025 · 1 permits on file · (940) 456-0320
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Robuck Petroleum LLC |
| Production reports | Robuck Petroleum, LLCthrough Mar 2026 |
| Latest permit | Perpetual Energy LLCApr 26, 2011 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 5,500
- total depth, ft
- 1
- permits on file
- Apr 26, 2011
- last permit issued
- Dec 13, 2011
- completed
- 8.46K
- cumulative oil, bbl
- 44.6K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 2011 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Dec 13, 2011
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active
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 |
|---|---|---|---|---|---|---|
| Knox D O-13-32189 | Halek (Caddo) | Robuck Petroleum, LLC | 1 | 8.46K | 44.6K | Dec 2011 – Jul 2026 |
Gas, mcf lease total
Last 12 months 1,136 · prior 12 1,226(-7%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Perpetual Energy LLCDec 2011 → May 2012
- 2Hunt Operating, LLCJun 2012 → Oct 2015
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 714042-99 | Drill | Perpetual Energy LLC | Apr 11, 2011 | Apr 26, 2011 | Apr 28, 2011 | 5,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-13-32189 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 1,215 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Pregnant Shale | 4,444 | -3,229 |
| Marble Falls | 4,751 | -3,536 |
| ChesterCHESTER LIMESTONE | 5,041 | -3,826 |
| BarnettBARNETT SHALE | 5,154 | -3,939 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 5,041 | 6,460 | Open hole |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 210 | 12.25 | 190 S |
| 5.5 | 5,041 | 7.875 | 175 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 | Sep 25, 2012 | Feb 16, 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 42-237-39425 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-237-39425 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward). 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/23739425, documented in the API reference.