COOPER 435

Oil · District 10 · Lease #7883

Operator: HIGHMARK ENERGY OPERATING, LLC

Cum Oil

196k BBL

Cum Gas

2.2M MCF

casinghead

Wells

4

Production

2008-07 — 2020-04

Peak Month

2009-07

Production History

Cum Oil: 195,761 BBL Cum Gas: 2,150,775 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

5,247 BBL/mo

Di (annual)

34.4%

b-factor

0.0

EUR

182,876 BBL

R-squared

0.874

type

exponential

Operator History (from monthly production reports)

2022-02 — 2023-07 HIGHMARK ENERGY OPERATING, LLC 18 mo
2008-07 — 2022-01 EOG RESOURCES, INC. 163 mo

Wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4HHIGHMARK ENERGY OPERATING LLC19,0002009-01-29
3VHHIGHMARK ENERGY OPERATING LLC19,0002008-06-25
2HHIGHMARK ENERGY OPERATING LLC19,0002008-04-04
1HHIGHMARK ENERGY OPERATING LLC19,0002008-03-19