42-003-35628

Final Completion

UNIVERSITY 173

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

Permits

Max Depth

11,850 ft

First Permit

1986-09-22

Latest Activity

1993-11-16

Lifespan

7 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

1987-01-16

Shut-In

—

Plugged

—

EWA / Permit operator mismatch

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

Resolved via: production → 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→ HIGHMARK ENERGY OPERATING, LLC 2023-2026

Lease Production

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

Formation Tops (5) Elevation 3,227 ft (GR)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
SAN ANDRES	4,487 ft	-1,260 ft
CLEARFORK (Clear Fork)	5,810 ft	-2,583 ft
WOLFCAMP	8,032 ft	-4,805 ft
DEVONIAN	9,388 ft	-6,161 ft
ELLENBURGER	11,675 ft	-8,448 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 (2)

Interval	Type
9,569–9,729 ft	Perforated
11,660–11,705 ft	Perforated

Casing (4)

Size	Set Depth	Cement
13.375"	370 ft	350 sx
9.625"	4,300 ft	2,300 sx
7"	11,731 ft	2,150 sx
7"	11,735 ft	2,150 sx

Permit History (2)

#418287 Recompletion Final Completion

UNIV. NOS. 141A,155F,173J,174K · 11,731 ft

1993-11-16

Spud 1993-11-18

#320685 Drill Final Completion

SKELLY UNIVERSITY 173 · 11,850 ft

1986-09-22

Applications (2)

#418287 A HENRY PETROLEUM CORP.

received 1993-11-16

#320685 A ARCO OIL & GAS CO.

received 1986-09-17

Records & Logs

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

W-2/G-1 1994-03-28 log on file

W-2/G-1 1987-01-29 log on file

W-2/G-1 1987-02-10

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: J 18
Max Depth: 11,850 ft
Drill Type: Vertical
County: ANDREWS
District: 8
Operator: HIGHMARK ENERGY OPERATING LLC
Completed: 1987-01-16

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