SANDERS 391

Oil · District 10 · Lease #8582

Operator: HIGHMARK ENERGY OPERATING, LLC

Cum Oil

170k BBL

Cum Gas

671k MCF

casinghead

Wells

1

Production

2011-04 — 2026-04

Peak Month

2011-09

Production History

Cum Oil: 169,557 BBL Cum Gas: 670,501 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

8,008 BBL/mo

Di (annual)

129.6%

b-factor

0.6

EUR

169,568 BBL

R-squared

0.970

type

hyperbolic

Operator History (from monthly production reports)

2022-02 — 2026-07 HIGHMARK ENERGY OPERATING, LLC 54 mo
2011-04 — 2022-01 EOG RESOURCES, INC. 130 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2HHIGHMARK ENERGY OPERATING, LLC19,0002011-02-15