SHINER RANCH -B-

Oil · District 01 · Lease #4721

Operator: TRIUMPH PETROLEUM COMPANY,L.L.C.

Fields: PEARSALL (AUSTIN CHALK)

Cum Oil

1.1M BBL

Cum Gas

498k MCF

casinghead

Wells

7

Production

1993-01 — 2026-04

Peak Month

1993-05

Production History

Cum Oil: 1,097,364 BBL Cum Gas: 498,354 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

44,386 BBL/mo

Di (annual)

68.5%

b-factor

0.3

EUR

1,107,528 BBL

R-squared

0.889

type

hyperbolic

Operator History (from monthly production reports)

2012-05 — 2026-07 BLACKBRUSH O & G, LLC 171 mo

2005-02 — 2012-04 BLACKBRUSH O & G, INC. 87 mo

2002-08 — 2005-01 TRIUMPH PETROLEUM COMPANY,L.L.C. 30 mo

2002-01 — 2002-07 HEC PETROLEUM, INC. 7 mo

1998-11 — 2001-12 HALLWOOD PETROLEUM, INC. 38 mo

1994-12 — 1998-10 ARCADIA EXPL. & PROD. COMPANY 47 mo

1993-01 — 1994-11 HINTON PRODUCTION COMPANY 23 mo

Wells (7)

WELL#	API	OPERATOR	PERMITS	DEPTH	LAST_ISSUED
2	42-163-31761	BLACKBRUSH O & G, LLC	3	7,700	2008-06-20
4	42-163-33145	BLACKBRUSH O & G, LLC	2	7,700	2006-05-04
3R	42-163-32804	BLACKBRUSH O & G, LLC	3	11,600	2002-02-06
B 3	42-163-32804	BLACKBRUSH O & G, LLC	3	11,600	2002-02-06
6	42-163-33149	BLACKBRUSH O & G, LLC	2	7,200	1993-02-18
5	42-163-33136	BLACKBRUSH O & G, LLC	2	7,180	1992-11-13
1	42-163-30271	BLACKBRUSH O & G, LLC	--	--	--