O'BRIEN -B-

Oil · District 08 · Lease #25954

Operator: NORTHSTAR OPERATING COMPANY

Cum Oil

104k BBL

Cum Gas

46k MCF

casinghead

Wells

1

Production

1993-01 — 2008-10

Peak Month

2001-07

Production History

Cum Oil: 103,815 BBL Cum Gas: 45,545 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

2,128 BBL/mo

Di (annual)

75.8%

b-factor

0.0

EUR

33,678 BBL

R-squared

0.833

type

exponential

Operator History (from monthly production reports)

2004-01 — 2010-02 NORTHSTAR OPERATING COMPANY 74 mo
1996-02 — 2003-12 LIMARK CORPORATION 95 mo
1993-01 — 1996-01 MWJ PRODUCING COMPANY 37 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1NORTHSTAR OPERATING COMPANY18,6001980-04-03