KOEHLER

Oil · District 03 · Lease #21227

Operator: NATIONAL ENERGY GROUP, INC.

Cum Oil

83k BBL

Cum Gas

603k MCF

casinghead

Wells

1

Production

1993-01 — 2025-10

Peak Month

1993-03

Production History

Cum Oil: 83,196 BBL Cum Gas: 603,086 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

1,025 BBL/mo

Di (annual)

96.1%

b-factor

0.3

EUR

18,155 BBL

R-squared

0.714

type

hyperbolic

Operator History (from monthly production reports)

1999-04 — 2026-07 AKG OPERATING COMPANY 328 mo
1996-09 — 1999-03 NATIONAL ENERGY GROUP, INC. 31 mo
1993-01 — 1996-08 ALEXANDER ENERGY CORPORATION 44 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2AKG OPERATING COMPANY111,4001991-04-26