DEVIN 187

Oil · District 10 · Lease #8604

Operator: HIGHMARK ENERGY OPERATING, LLC

Cum Oil

109k BBL

Cum Gas

793k MCF

casinghead

Wells

1

Production

2012-01 — 2026-04

Peak Month

2012-02

Production History

Cum Oil: 109,017 BBL Cum Gas: 792,810 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

2,162 BBL/mo

Di (annual)

88.9%

b-factor

0.7

EUR

75,317 BBL

R-squared

0.433

type

hyperbolic

Operator History (from monthly production reports)

2022-02 — 2026-07 HIGHMARK ENERGY OPERATING, LLC 54 mo
2012-01 — 2022-01 EOG RESOURCES, INC. 121 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2HHIGHMARK ENERGY OPERATING, LLC19,0002011-06-08