CLARK -15-

Oil · District 7C · Lease #12165

Operator: UMC PETROLEUM CORPORATION

Cum Oil

18k BBL

Cum Gas

156k MCF

casinghead

Wells

1

Production

1993-01 — 2025-06

Peak Month

1994-08

Production History

Cum Oil: 17,544 BBL Cum Gas: 156,206 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

89 BBL/mo

Di (annual)

27.9%

b-factor

0.0

EUR

3,782 BBL

R-squared

0.364

type

exponential

Operator History (from monthly production reports)

2025-10 — 2026-07 DE CENTRAL OPERATING, LLC 10 mo
2010-04 — 2025-09 ATLAS OPERATING LLC 186 mo
2008-02 — 2010-03 PIONEER EXPLORATION, LLC 26 mo
2001-07 — 2008-01 PIONEER EXPLORATION, LTD. 79 mo
1997-04 — 2001-06 PIONEER EXPLORATION COMPANY 51 mo
1993-01 — 1997-03 UMC PETROLEUM CORPORATION 51 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
3CITATION OIL & GAS CORP.18,2001985-06-21