HILDEBRAND

Oil · District 01 · Lease #13559

Operator: UNION PACIFIC AUSTIN CHALK CO.

Fields: PEARSALL (AUSTIN CHALK)

Cum Oil

1.4M BBL

Cum Gas

587k MCF

casinghead

Wells

5

Production

1993-01 — 2014-12

Peak Month

1993-03

Production History

Cum Oil: 1,442,158 BBL Cum Gas: 586,787 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

35,808 BBL/mo

Di (annual)

27.9%

b-factor

0.0

EUR

1,540,320 BBL

R-squared

0.729

type

exponential

Operator History (from monthly production reports)

2012-05 — 2021-10 BLACKBRUSH O & G, LLC 114 mo

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

2001-08 — 2005-01 TRIUMPH PETROLEUM COMPANY,L.L.C. 42 mo

2000-10 — 2001-07 ARCADIA EXPL. & PROD. COMPANY 10 mo

1995-09 — 2000-09 ARROW EXPLORATION COMPANY 61 mo

1995-05 — 1995-08 UNION PACIFIC AUSTIN CHALK CO. 4 mo

1993-01 — 1995-04 GEMINI EXPLORATION COMPANY 28 mo

Wells (5)

WELL#	API	OPERATOR	PERMITS	DEPTH	LAST_ISSUED
5	42-163-33151	BLACKBRUSH O & G LLC	1	7,500	1993-02-24
4	42-163-33143	BLACKBRUSH O & G LLC	2	7,300	1992-12-23
3	42-163-33139	BLACKBRUSH O & G LLC	1	7,300	1992-10-22
2	42-163-33130	BLACKBRUSH O & G LLC	1	7,300	1992-06-26
1	42-163-33127	BLACKBRUSH O & G LLC	1	7,300	1992-05-07