CURTIS "I"

Oil · District 10 · Lease #33031

Operator: PIONEER NATURAL RES. USA, INC.

Cum Oil

98k BBL

Cum Gas

0 MCF

Wells

4

Production

1993-01 — 2015-01

Peak Month

2011-05

Production History

Cum Oil: 97,711 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

2,111 BBL/mo

Di (annual)

64.6%

b-factor

0.2

EUR

48,934 BBL

R-squared

0.913

type

hyperbolic

Wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4PIONEER NATURAL RES. USA, INC.211,5342010-08-19
3PIONEER NATURAL RES. USA, INC.111,5002009-09-24
2PIONEER NATURAL RES. USA, INC.210,0002004-12-16
1PARKER & PARSLEY, LTD.19,7501990-12-21
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