PAISANO RANCH -13-

Oil · District 1 · Lease #14151

Operator: PETRA OLEUM CORP.

Cum Oil

2k BBL

Cum Gas

0 MCF

Wells

1

Production

1997-09 — 2002-08

Peak Month

1997-11

Production History

Cum Oil: 2,224 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

140 BBL/mo

Di (annual)

735.6%

b-factor

2.0

EUR

5,966 BBL

R-squared

0.415

type

hyperbolic

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1COSTILLA ENERGY, INC.112,0001997-04-21
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