JOHNSON -A-

Oil · District 08 · Lease #26596

Operator: SHERIDAN PRODUCTION COMPANY, LLC

Cum Oil

49k BBL

Cum Gas

4k MCF

casinghead

Wells

2

Production

1993-01 — 2026-04

Peak Month

1993-03

Production History

Cum Oil: 48,977 BBL Cum Gas: 3,721 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

180 BBL/mo

Di (annual)

2.9%

b-factor

0.0

EUR

56,525 BBL

R-squared

0.419

type

exponential

Operator History (from monthly production reports)

2023-03 — 2026-07 HIGHMARK ENERGY OPERATING, LLC 41 mo
2010-09 — 2023-02 LEGACY RESERVES OPERATING LP 150 mo
2007-08 — 2010-08 SHERIDAN PRODUCTION COMPANY, LLC 37 mo
2003-08 — 2007-07 SAGE ENERGY COMPANY 48 mo
1998-12 — 2003-07 BLANCO OIL CO. 56 mo
1993-01 — 1998-11 OXY USA INC. 71 mo

Wells (2)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
9HIGHMARK ENERGY OPERATING, LLC19,2501982-07-26
8HIGHMARK ENERGY OPERATING, LLC19,5001981-03-30