42-461-30146

Final Completion

MOBIL-COOK

UPTON County · District 7 · EXTEX OPERATING COMPANY · HELUMA (ELLENBURGER)

Permits

Max Depth

10,650 ft

First Permit

1986-01-29

Latest Activity

1993-10-22

Lifespan

8 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

—

Shut-In

—

Plugged

—

EWA / Permit operator mismatch

Scheduling: EXTEX OPERATING COMPANY ≠ Permit: ORYX ENERGY COMPANY

Resolved via: production → EXTEX OPERATING COMPANY

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

1993-01

Last Production

2026-07

Operator History

Chain of Custody

ORYX ENERGY COMPANY 1993-1995→ SAMSON HYDROCARBONS COMPANY 1995-1996→ SAMSON LONE STAR LP 1996-2007→ SAMSON LONE STAR, LLC 2007-2010→ THREE RIVERS OPERATING CO LLC 2011-2012→ COG OPERATING LLC 2012-2012→ LEGACY RESERVES OPERATING LP 2013-2021→ EXTEX OPERATING COMPANY 2021-2026

Lease Production

Production is reported at the lease level. View production data, decline curves, and history on the lease page.

Oil

production & DCA →

Formation Tops (2) Elevation 2,882 ft (GR)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
PENN (Pennsylvanian)	7,590 ft	-4,708 ft
DEVONIAN	7,998 ft	-5,116 ft

As reported by operators on W-2/G-1 completion filings (RRC wellbore records). Depths are measured depth; names appear as filed. Subsea = reported elevation − measured depth (negative = below sea level; vertical wellbores only). View filings & logs at RRC ↗

Perforations (7)

Interval	Type
7,594–7,614 ft	Perforated
7,854–7,868 ft	Perforated
7,892–7,967 ft	Perforated
8,313–8,766 ft	Perforated
8,487–8,748 ft	Perforated
?–8,748 ft	Perforated
?–10,621 ft	Perforated

Casing (3)

Size	Set Depth	Cement
13.375"	500 ft	600 sx
9.625"	3,800 ft	985 sx
7"	10,650 ft	1,475 sx

Permit History (2)

#416070 Recompletion Final Completion

MOBIL-COOK · 10,650 ft

1993-10-22

Spud 1994-03-26

#296867 Recompletion U

MOBIL-COOK · 10,650 ft

1986-01-29

Applications (2)

#416070 A ORYX ENERGY COMPANY

received 1993-09-15

#296867 A SUN EXPL. & PROD. CO.-MIDLAND

received 1985-11-04

Records & Logs

4 completion filings on record.

W-2/G-1 1994-07-05

W-2/G-1 1986-04-25

W-2/G-1 1973-04-20

W-2/G-1 1984-01-12

Completion packets + logs ↗ Wellbore filings ↗

Completion packets open directly (post-2011 filings include attached logs). Log images and the UL library can't be deep-linked — clicking copies the API for you to paste.

No GPS coordinates yet

Coordinates come from the RRC GIS backfill and usually appear within days of permit issuance. Located in UPTON County.

Well Details

Well Number: 1
Max Depth: 10,650 ft
Drill Type: Vertical
County: UPTON
District: 7
Operator: EXTEX OPERATING COMPANY

Operator

Name: EXTEX OPER CO
Location: HOUSTON
P-5 Status: Active (filed 2026-01-07)
Cum Oil (all leases): 5,887,486 bbl
Cum Gas (all leases): 10,031,045 mcf
Activities: OPRS/G, OPRS/O
Total Permits: 117