42-339-30608

PRODUCING

KEYSTONE MILLS

MONTGOMERY County · District 3 · HIGHMARK ENERGY OPERATING LLC · CONROE (MIDDLE WILCOX CONS.)

RRC Lookup

Permits

Max Depth

12,000 ft

First Permit

1983-09-30

Latest Activity

2001-05-25

Lifespan

18 yrs

Regulatory Status

Schedule

ON SCHEDULE

Completion

2018-10-17

Shut-In

—

Plugged

—

P-5 Org Status: Delinquent

EWA / Permit operator mismatch

Scheduling: HIGHMARK ENERGY OPERATING LLC ≠ Permit: EXXON MOBIL CORPORATION

Resolved via: production → HIGHMARK ENERGY OPERATING, LLC

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

1993-01

Last Production

2026-03

Operator History

Chain of Custody

EXXON CORP. 1993-2000→ EXXON MOBIL CORPORATION 2000-2001→ WAPITI OPERATING, LLC 2009-2009→ DENBURY ONSHORE, LLC 2010-2024→ HIGHMARK ENERGY OPERATING, LLC 2024-2025

Lease Production

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

Permit History (2)

#509449 Recompletion

KEYSTONE MILLS · 10,324 ft

2001-05-25

#215645 Drill Final Completion

KEYSTONE MILLS · 12,000 ft

1983-09-30

Spud 1983-12-09

Permit Applications (2)

#509449 A EXXON MOBIL CORPORATION

received 2001-05-25

#215645 A EXXON CORP.

received 1983-09-23

Well Details

Well Number: 40
Max Depth: 12,000 ft
Drill Type: Vertical
County: MONTGOMERY
District: 3
Operator: HIGHMARK ENERGY OPERATING LLC
Completed: 2018-10-17

Operator

Name: HIGHMARK ENGY OPER, LLC
Location: DALLAS
P-5 Status: Y (filed 2025-12-04)
Cum Oil (all leases): 4,103,460 bbl
Cum Gas (all leases): 29,480,638 mcf
Activities: CSGD/G, G/PUR, GTHS/G, OPRS/G, OPRS/O
Total Permits: 15

External Links

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