COOPER 436

Oil · District 10 · Lease #7515

Operator: HIGHMARK ENERGY OPERATING, LLC

Cum Oil

221k BBL

Cum Gas

2.4M MCF

casinghead

Wells

4

Production

2004-04 — 2026-04

Peak Month

2009-11

Production History

Cum Oil: 221,188 BBL Cum Gas: 2,436,611 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

8,052 BBL/mo

Di (annual)

106.2%

b-factor

0.4

EUR

150,253 BBL

R-squared

0.782

type

hyperbolic

Operator History (from monthly production reports)

2022-02 — 2026-07 HIGHMARK ENERGY OPERATING, LLC 54 mo
2004-04 — 2022-01 EOG RESOURCES, INC. 214 mo

Wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4HHIGHMARK ENERGY OPERATING, LLC19,0002009-01-21
3HHIGHMARK ENERGY OPERATING, LLC19,0002008-04-04
2HHIGHMARK ENERGY OPERATING, LLC19,0002007-08-10
1HIGHMARK ENERGY OPERATING, LLC28,6502003-12-16