WELL · 42-461-30146 · DISTRICT 7
Mobil-Cook #1
Upton County · Heluma (Ellenburger) field · Vertical
Mobil-Cook #1 (API 42-461-30146) is a permitted well in Upton County filed by Oryx Energy Company; no completion report is on file yet.
The RRC has issued 2 drilling permits between 1986 and 1993, permitted to 10,650 ft.
It was permitted by Oryx Energy Company and has since transferred to Extex Operating Company on the wellbore schedule.
Completion filings report 2 formation tops, including Pennsylvanian, Devonian.
Its lease has reported 310K barrels of oil and 3.28M mcf of gas since January 1993, last reporting in July 2026. The lease carries 6 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Oryx Energy Company; the EWA schedule now lists a different operator.
Houston, TX · P-5 Y, filed Nov 4, 2025 · 117 permits on file · (713) 870-4327
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Extex Operating Company |
| Production reports | Extex Operating Companythrough Apr 2026 |
| Latest permit | Oryx Energy CompanyOct 22, 1993 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,650
- total depth, ft
- 2
- permits on file
- Oct 22, 1993
- last permit issued
- —
- completed
- 310K
- cumulative oil, bbl
- 3.28M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 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 6 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Mobil-Cook O-9-6330 | Heluma, East (Devonian) | Extex Operating Company | 6 | 310K | 3.28M | Jan 1993 – Jul 2026 |
Oil, barrels lease total
Last 12 months 4,745 · prior 12 5,045(-6%)
Gas, mcf lease total
Last 12 months 20,057 · prior 12 28,199(-29%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Oryx Energy CompanyJan 1993 → Mar 1995
- 2Samson Hydrocarbons CompanyApr 1995 → Jul 1996
- 3Samson Lone Star LPAug 1996 → Jun 2007
- 4Samson Lone Star, LLCJul 2007 → Dec 2010
- 5Three Rivers Operating Co LLCJan 2011 → Jul 2012
- 6COG Operating LLCAug 2012 → Dec 2012
- 7Legacy Reserves Operating LPJan 2013 → Jan 2021
- 8Extex Operating CompanyFeb 2021 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 416070-99 | Recompletion | Oryx Energy Company | Sep 15, 1993 | Oct 22, 1993 | Mar 26, 1994 | 10,650 |
| 296867-99 | Recompletion | Sun Expl. & Prod. Co.-Midland | Nov 4, 1985 | Jan 29, 1986 | — | 10,650 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-9-6330 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,882 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| PennsylvanianPENN | 7,590 | -4,708 |
| Devonian | 7,998 | -5,116 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,594 | 7,614 | Perforated |
| 7,854 | 7,868 | Perforated |
| 7,892 | 7,967 | Perforated |
| 8,313 | 8,766 | Perforated |
| 8,487 | 8,748 | Perforated |
| — | 8,748 | Perforated |
| — | 10,621 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 500 | 17 | 600 S |
| 9.625 | 3,800 | 12.25 | 985 S |
| 7 | 10,650 | 8.75 | 1,475 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 14, 1994 | Jul 5, 1994 | — |
| 00 | May 9, 1986 | Apr 25, 1986 | — |
| 00 | Jan 12, 1984 | Apr 20, 1973 | — |
| 00 | Jan 12, 1984 | — | — |
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 42-461-30146 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-461-30146 → 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/46130146, documented in the API reference.