COOPER 445

Oil · District 10 · Lease #7900

Operator: HIGHMARK ENERGY OPERATING, LLC

Cum Oil

241k BBL

Cum Gas

2.4M MCF

casinghead

Wells

4

Production

2008-06 — 2026-04

Peak Month

2009-07

Production History

Cum Oil: 240,787 BBL Cum Gas: 2,371,403 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

10,599 BBL/mo

Di (annual)

160.0%

b-factor

0.7

EUR

218,223 BBL

R-squared

0.904

type

hyperbolic

Operator History (from monthly production reports)

2022-02 — 2026-07 HIGHMARK ENERGY OPERATING, LLC 54 mo
2008-06 — 2022-01 EOG RESOURCES, INC. 164 mo

Wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4HHIGHMARK ENERGY OPERATING, LLC19,0002009-01-21
3HHIGHMARK ENERGY OPERATING, LLC19,0002008-05-28
2HHIGHMARK ENERGY OPERATING, LLC19,0002008-04-14
1HHIGHMARK ENERGY OPERATING, LLC19,0002008-03-13