42-427-33152

Final Completion

MARRS MCLEAN

STARR County · District 4 · OPEX ENERGY LLC · LOCKHART (COCKFIELD 4)

Permits

Max Depth

5,000 ft

First Permit

1999-02-03

Latest Activity

2005-05-06

Lifespan

6 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

1999-04-29

Shut-In

—

Plugged

—

EWA / Production operator mismatch

Scheduling: OPEX ENERGY LLC ≠ Production: WHITE STRIDE LLC (reported 2026-03)

Resolved via: production → WHITE STRIDE LLC

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

1999-04

Last Production

2026-07

Operator History

Chain of Custody

CENIZA PETROLEUM, INC. 1999-2003→ WHITE OAK OPERATING COMPANY LLC 2003-2003→ OPEX ENERGY, LLC 2005-2007→ EXPLORATION COMPANY, THE 2007-2007→ TXCO RESOURCES INC. 2007-2008→ CONTINENTAL OPERATING CO. 2008-2019→ MAVERICK BROTHERS OPERATING,INC. 2019-2025→ WHITE STRIDE LLC 2025-2026

Lease Production

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

Formation Tops (5) Elevation 340 ft (GR)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
PETTUS	3,500 ft	-3,160 ft
COCKFIELD1	3,555 ft	-3,215 ft
COCKFIELD2	3,678 ft	-3,338 ft
COCKFIELD4	3,870 ft	-3,530 ft
YEGUAF	4,375 ft	-4,035 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
3,504–3,520 ft	Perforated
3,871–3,873 ft	Perforated

Casing (3)

Size	Set Depth	Cement
8.625"	312 ft	220 sx
40.5"	4,450 ft	410 sx
4.5"	4,450 ft	410 sx

Permit History (2)

#600285 Recompletion Final Completion

MCLEAN, MARRS · 4,510 ft

2005-05-06

Spud 2005-04-27

#482436 Drill Final Completion

MARRS MCLEAN · 5,000 ft

1999-02-03

Spud 1999-02-06

Applications (2)

#600285 A OPEX ENERGY, LLC

received 2005-05-05

#482436 A CENIZA PETROLEUM, INC.

received 1999-02-03

Records & Logs

4 completion filings on record · 2 with log images at RRC.

W-2/G-1 2005-05-19 log on file

W-2/G-1 2005-08-10

W-2/G-1 1999-05-21 log on file

W-2/G-1 1999-06-09

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 STARR County.

Well Details

Well Number: 29
Max Depth: 5,000 ft
Drill Type: Vertical
County: STARR
District: 4
Operator: OPEX ENERGY LLC
Completed: 1999-04-29

Operator

Name: OPEX ENGY, LLC
Location: HOUSTON
P-5 Status: Inactive (filed 2007-04-12)
Cum Oil (all leases): 165,669 bbl
Cum Gas (all leases): 1,916,723 mcf
Total Permits: 19