BROWNLEE 128

Oil · District 10 · Lease #8629

Operator: HIGHMARK ENERGY OPERATING, LLC

Cum Oil

157k BBL

Cum Gas

580k MCF

casinghead

Wells

2

Production

2012-06 — 2026-04

Peak Month

2012-07

Production History

Cum Oil: 156,864 BBL Cum Gas: 579,696 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

2,088 BBL/mo

Di (annual)

20.5%

b-factor

0.0

EUR

122,039 BBL

R-squared

0.473

type

exponential

Operator History (from monthly production reports)

2022-02 — 2026-07 HIGHMARK ENERGY OPERATING, LLC 54 mo
2012-06 — 2022-01 EOG RESOURCES, INC. 116 mo

Wells (2)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4HHIGHMARK ENERGY OPERATING, LLC19,0002011-04-29
3HHIGHMARK ENERGY OPERATING, LLC19,0002011-03-08