WINDHAM, R. S. ETAL -2-

Oil · District 7C · Lease #12710

Operator: WILDHORSE OPERATING COMPANY

Fields: JACK HERBERT (STRAWN PENN.)

Cum Oil

10k BBL

Cum Gas

233k MCF

casinghead

Wells

1

Production

1993-01 — 2007-03

Peak Month

1996-09

Production History

Cum Oil: 9,631 BBL Cum Gas: 233,162 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

276 BBL/mo

Di (annual)

650.0%

b-factor

1.5

EUR

7,014 BBL

R-squared

0.491

type

hyperbolic

Operator History (from monthly production reports)

2001-08 — 2009-04 WILDHORSE OPERATING COMPANY 93 mo

1999-04 — 2001-07 WILDHORSE OIL & GAS CORPORATION 28 mo

1993-08 — 1999-03 KAISER-FRANCIS OIL COMPANY 68 mo

1993-01 — 1993-07 PENNZOIL PETROLEUM COMPANY 7 mo

Wells (1)

WELL#	API	OPERATOR	PERMITS	DEPTH	LAST_ISSUED
1	42-461-01945	V-F PETROLEUM INC.	1	11,793	1989-05-19