LOCKHART 1001

Oil · District 10 · Lease #8927

Operator: HIGHMARK ENERGY OPERATING, LLC

Cum Oil

80k BBL

Cum Gas

352k MCF

casinghead

Wells

1

Production

2013-09 — 2026-04

Peak Month

2013-11

Production History

Cum Oil: 79,968 BBL Cum Gas: 351,827 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

1,092 BBL/mo

Di (annual)

18.5%

b-factor

0.0

EUR

70,927 BBL

R-squared

0.404

type

exponential

Operator History (from monthly production reports)

2022-02 — 2026-07 HIGHMARK ENERGY OPERATING, LLC 54 mo
2013-09 — 2022-01 EOG RESOURCES, INC. 101 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1HHIGHMARK ENERGY OPERATING, LLC19,0002013-05-14