KING-BOX UNIT

Oil · District 13 · Lease #28415

Operator: WESTERN CHIEF OIL & GAS COMPANY

Cum Oil

52k BBL

Cum Gas

0 MCF

Wells

1

Production

1993-01 — 2008-03

Peak Month

1994-05

Production History

Cum Oil: 52,490 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

1,332 BBL/mo

Di (annual)

68.5%

b-factor

0.2

EUR

29,092 BBL

R-squared

0.803

type

hyperbolic

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1WESTERN CHIEF OIL & GAS COMPANY25,3002004-04-27
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