GAMBLE

Oil · District 13 · Lease #31242

Operator: PIONEER NATURAL RES. USA, INC.

Cum Oil

1k BBL

Cum Gas

0 MCF

Wells

1

Production

2008-09 — 2011-06

Peak Month

2008-11

Production History

Cum Oil: 1,468 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

266 BBL/mo

Di (annual)

128.6%

b-factor

0.0

EUR

2,474 BBL

R-squared

0.358

type

exponential

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1HDUNE OPERATING COMPANY19,5002008-03-11
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