CHALK, G. O. -D-

Oil · District 10 · Lease #22055

Operator: CONOCOPHILLIPS COMPANY

Cum Oil

157k BBL

Cum Gas

0 MCF

Wells

5

Production

1993-01 — 2012-04

Peak Month

2011-05

Production History

Cum Oil: 157,085 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

2,224 BBL/mo

Di (annual)

79.5%

b-factor

0.2

EUR

41,880 BBL

R-squared

0.428

type

hyperbolic

Wells (5)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
28CONOCOPHILLIPS COMPANY24,6002011-10-25
27CONOCOPHILLIPS COMPANY24,6002011-03-04
24CONOCO INC.26,5001987-09-16
16CONOCO INC.13,9001983-05-04
17CONOCO INC.13,9001983-05-04
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