KUNKEL-SALYER

Oil · District 02 · Lease #7623

Operator: WHITFIELD, BILLY C.

Fields: HOBSON

Cum Oil

6k BBL

Cum Gas

13 MCF

casinghead

Wells

1

Production

1993-01 — 2005-08

Peak Month

1993-01

Production History

Cum Oil: 5,634 BBL Cum Gas: 13 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

240 BBL/mo

Di (annual)

291.9%

b-factor

1.4

EUR

8,840 BBL

R-squared

0.784

type

hyperbolic

Operator History (from monthly production reports)

2012-05 — 2016-06 BLACKBRUSH O & G, LLC 50 mo

2005-01 — 2012-04 BLACKBRUSH O & G, INC. 88 mo

2003-01 — 2004-12 FLATROCK PRODUCTION COMPANY, LLC 24 mo

1994-05 — 2002-12 WHITFIELD, BILLY C. 104 mo

1993-01 — 1994-04 BAY ROCK OPERATING COMPANY 16 mo

Wells (1)

WELL#	API	OPERATOR	PERMITS	DEPTH	LAST_ISSUED
1	42-255-31252	BLACKBRUSH O & G LLC	1	4,200	1990-08-06