42-003-35945

Final Completion

UNIVERSITY -C-

ANDREWS County · District 8 · HIGHMARK ENERGY OPERATING LLC · SHAFTER LAKE (ELLENBURGER)

Permits

Max Depth

11,900 ft

First Permit

1987-10-19

Latest Activity

1995-10-12

Lifespan

8 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

1987-12-19

Shut-In

—

Plugged

—

EWA / Production operator mismatch

Scheduling: HIGHMARK ENERGY OPERATING LLC ≠ Production: LEGACY RESERVES OPERATING LP (reported 2020-10)

EWA / Permit operator mismatch

Scheduling: HIGHMARK ENERGY OPERATING LLC ≠ Permit: HENRY PETROLEUM CORP.

Resolved via: scheduling → HIGHMARK ENERGY OPERATING LLC

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

1993-01

Last Production

2026-07

Operator History

Chain of Custody

HENRY PETROLEUM CORP. 1993-2001→ HENRY PETROLEUM LP 2001-2008→ COG OPERATING LLC 2009-2012→ LEGACY RESERVES OPERATING LP 2013-2020

Lease Production

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

Formation Tops (6) Elevation 3,206 ft (GR)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
YATES	2,905 ft	+301 ft
SAN ANDRES	4,425 ft	-1,219 ft
WOLFCAMP	8,006 ft	-4,800 ft
WOODFORD	9,250 ft	-6,044 ft
DEVONIAN	9,390 ft	-6,184 ft
ELLENBURGER	11,580 ft	-8,374 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 (4)

Interval	Type
9,613–9,620 ft	Perforated
9,630–9,660 ft	Perforated
9,750–9,787 ft	Perforated
11,587–11,655 ft	Perforated

Casing (3)

Size	Set Depth	Cement
13.375"	370 ft	375 sx
9.625"	4,350 ft	2,450 sx
7"	11,700 ft	2,115 sx

Permit History (2)

#440822 Recompletion Final Completion

UNIVERSITY -C- · 11,700 ft

1995-10-12

Spud 1995-10-10

#337664 Drill Final Completion

UNIVERSITY "C" · 11,900 ft

1987-10-19

Spud 1987-10-30

Applications (2)

#440822 A HENRY PETROLEUM CORP.

received 1995-10-12

#337664 A ARCO OIL & GAS CO.

received 1987-10-19

Records & Logs

5 completion filings on record · 3 with log images at RRC.

W-2/G-1 2020-04-20

W-2/G-1 1995-10-24 log on file

W-2/G-1 1988-01-04 log on file

W-2/G-1 1988-01-16

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 ANDREWS County.

Well Details

Well Number: 5
Max Depth: 11,900 ft
Drill Type: Vertical
County: ANDREWS
District: 8
Operator: HIGHMARK ENERGY OPERATING LLC
Completed: 1987-12-19

Operator

Name: HIGHMARK ENGY OPER, LLC
Location: HOUSTON
P-5 Status: Active (filed 2026-03-09)
Cum Oil (all leases): 4,551,977 bbl
Cum Gas (all leases): 30,465,409 mcf
Activities: CSGD/G, G/PUR, GTHS/G, OPRS/G, OPRS/O
Total Permits: 15