GUTHRIE UNIT

Oil · District 8 · Lease #28458

Operator: WHITING OIL AND GAS CORPORATION

Cum Oil

33k BBL

Cum Gas

0 MCF

Wells

1

Production

1998-04 — 2013-06

Peak Month

1998-05

Production History

Cum Oil: 33,280 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

3,773 BBL/mo

Di (annual)

124.0%

b-factor

0.0

EUR

36,547 BBL

R-squared

0.494

type

exponential

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1HALLWOOD PETROLEUM, INC.25,7001997-03-19
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