CHALK, G. O. -D-

Oil · District 10 · Lease #18990

Operator: CONOCOPHILLIPS COMPANY

Cum Oil

171k BBL

Cum Gas

0 MCF

Wells

8

Production

1993-01 — 2012-04

Peak Month

1993-04

Production History

Cum Oil: 170,953 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

1,565 BBL/mo

Di (annual)

13.5%

b-factor

0.6

EUR

229,928 BBL

R-squared

0.756

type

hyperbolic

Wells (8)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
20CONOCO INC.13,2501980-06-05
21CONOCO INC.13,2501980-06-05
18CONTINENTAL OIL COMPANY13,2001977-12-02
442-227-00379--------
542-227-00512--------
642-227-00510--------
7W42-227-10068--------
8 L42-227-10069--------
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