COX "21"

Oil · District 9 · Lease #15826

Operator: PURE RESOURCES, L.P.

Cum Oil

5k BBL

Cum Gas

0 MCF

Wells

1

Production

2005-09 — 2006-08

Peak Month

2005-09

Production History

Cum Oil: 4,977 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

1,442 BBL/mo

Di (annual)

974.3%

b-factor

1.6

EUR

33,102 BBL

R-squared

0.936

type

hyperbolic

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1PURE RESOURCES, L.P.210,0002006-02-22
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