COOPER 348

Oil · District 10 · Lease #7627

Operator: HIGHMARK ENERGY OPERATING, LLC

Cum Oil

141k BBL

Cum Gas

860k MCF

casinghead

Wells

4

Production

2006-01 — 2026-04

Peak Month

2007-01

Production History

Cum Oil: 141,391 BBL Cum Gas: 859,787 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

3,685 BBL/mo

Di (annual)

85.5%

b-factor

0.5

EUR

98,890 BBL

R-squared

0.772

type

hyperbolic

Operator History (from monthly production reports)

2022-02 — 2026-07 HIGHMARK ENERGY OPERATING, LLC 54 mo
2006-01 — 2022-01 EOG RESOURCES, INC. 193 mo

Wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
3HHIGHMARK ENERGY OPERATING, LLC19,0002007-02-26
4HHIGHMARK ENERGY OPERATING, LLC19,0002007-02-26
2HHIGHMARK ENERGY OPERATING, LLC19,0002006-08-07
1HHIGHMARK ENERGY OPERATING, LLC19,0002005-11-01