42-079-30778

Final Completion

MASTEN J

COCHRAN County · District 8 · UNION OIL COMPANY OF CALIFORNIA · LEVELLAND (SAN ANDRES)

Permits

Max Depth

4,945 ft

First Permit

1978-01-04

Latest Activity

1979-12-11

Lifespan

2 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

—

Shut-In

—

Plugged

2010-05-04

EWA / Production operator mismatch

Scheduling: UNION OIL COMPANY OF CALIFORNIA ≠ Production: TALIS ENERGY INC. (reported 2026-03)

Resolved via: production → TALIS ENERGY INC.

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

1993-01

Last Production

2026-07

Injection / Disposal

H-1 Injection Plugged 2010-05-12 UIC #000080706 permitted 1994-07-29

Permitted Volume

385 bbl/d

Max Pressure

2,400 psi

Injection Interval

4,800–5,000 ft

Injected (12mo)

—

Operator History

Chain of Custody

UNION OIL COMPANY OF CALIFORNIA 1993-2000→ PURE RESOURCES, L.P. 2000-2006→ CHEVRON MIDCONTINENT, L.P. 2006-2015→ STEWARD ENERGY II, LLC 2015-2020→ RMB OPERATING LLC 2020-2023→ OILWELL OPERATORS, INC. 2023-2025→ TALIS ENERGY INC. 2025-2026

Lease Production

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

Formation Tops (4) Elevation 3,840 ft (GR)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
RUSTLER ANHYDRITE (Rustler)	2,305 ft	+1,535 ft
YATES	2,835 ft	+1,005 ft
GRAYBURG	3,860 ft	-20 ft
SAN ANDRES	4,075 ft	-235 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 (3)

Interval	Type
4,773–4,804 ft	Perforated
4,773–4,937 ft	Perforated
4,912–4,932 ft	Perforated

Casing (3)

Size	Set Depth	Cement
8.625"	436 ft	—
2.375"	4,924 ft	—
5.5"	4,945 ft	3,360 sx

Permit History (2)

#66426 Other Final Completion

MASTEN "J" · 4,945 ft

1979-12-11

Spud 1979-10-16

#2605 Drill

MASTEN "J" · 4,925 ft

1978-01-04

Applications (2)

#66426 A UNION OIL COMPANY OF CALIFORNIA

received 1979-12-11

#2605 A UNION OIL COMPANY OF CALIFORNIA

received 1978-01-04

Records & Logs

5 completion filings on record.

W-2/G-1 2005-01-14

W-2/G-1 1994-11-02

W-2/G-1 1979-12-07

W-2/G-1 1977-12-05

Completion packets + logs ↗ Wellbore filings ↗

Completion packets open directly (post-2011 filings include attached logs). Log images 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 COCHRAN County.

Well Details

Well Number: 5
Max Depth: 4,945 ft
Drill Type: Vertical
County: COCHRAN
District: 8
Operator: UNION OIL COMPANY OF CALIFORNIA

Operator

Name: UNION OIL CO OF CALIFORNIA
Location: MIDLAND
P-5 Status: Inactive (filed 2020-11-18)
Cum Oil (all leases): 78,952,713 bbl
Cum Gas (all leases): 197,557,199 mcf
Total Permits: 2,336