C. B. ERWIN OIL UNIT

Oil · District 4 · Lease #12592

Operator: PIONEER RESOURCES PRODUCING, L.P

Cum Oil

1k BBL

Cum Gas

0 MCF

Wells

1

Production

1996-08 — 1997-11

Peak Month

1996-12

Production History

Cum Oil: 1,464 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

269 BBL/mo

Di (annual)

962.5%

b-factor

0.7

EUR

926 BBL

R-squared

0.921

type

hyperbolic

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1PIONEER NATURAL RES. USA, INC.68,3002005-02-17
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