TROSPER, CORWIN 431

Oil · District 10 · Lease #7609

Operator: HIGHMARK ENERGY OPERATING, LLC

Cum Oil

58k BBL

Cum Gas

648k MCF

casinghead

Wells

2

Production

2005-08 — 2026-04

Peak Month

2008-09

Production History

Cum Oil: 58,247 BBL Cum Gas: 647,974 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

900 BBL/mo

Di (annual)

30.9%

b-factor

0.3

EUR

49,032 BBL

R-squared

0.447

type

hyperbolic

Operator History (from monthly production reports)

2022-02 — 2026-07 HIGHMARK ENERGY OPERATING, LLC 54 mo
2005-08 — 2022-01 EOG RESOURCES, INC. 198 mo

Wells (2)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4HHIGHMARK ENERGY OPERATING, LLC29,0002008-03-19
3HHIGHMARK ENERGY OPERATING, LLC19,0002005-07-18