COOPER 358

Oil · District 10 · Lease #7764

Operator: HIGHMARK ENERGY OPERATING, LLC

Cum Oil

277k BBL

Cum Gas

3.0M MCF

casinghead

Wells

4

Production

2007-05 — 2026-04

Peak Month

2008-10

Production History

Cum Oil: 276,991 BBL Cum Gas: 3,026,225 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

6,759 BBL/mo

Di (annual)

68.5%

b-factor

0.5

EUR

223,783 BBL

R-squared

0.803

type

hyperbolic

Operator History (from monthly production reports)

2022-02 — 2026-07 HIGHMARK ENERGY OPERATING, LLC 54 mo
2007-05 — 2022-01 EOG RESOURCES, INC. 177 mo

Wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
5HHIGHMARK ENERGY OPERATING, LLC19,0002009-04-28
3HHIGHMARK ENERGY OPERATING, LLC19,0002008-04-14
2HHIGHMARK ENERGY OPERATING, LLC312,5002007-03-02
1HHIGHMARK ENERGY OPERATING, LLC212,0002006-12-21