CHALK-DUNCAN

Oil · District 10 · Lease #2720

Operator: CONOCOPHILLIPS COMPANY

Cum Oil

858k BBL

Cum Gas

0 MCF

Wells

16

Production

1993-01 — 2012-04

Peak Month

2003-08

Production History

Cum Oil: 858,003 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

6,058 BBL/mo

Di (annual)

30.3%

b-factor

0.9

EUR

618,346 BBL

R-squared

0.868

type

hyperbolic

Wells (16)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
15CONOCO INC.13,3001989-05-02
16CONOCO INC.13,3001989-05-02
12CONOCO INC.13,3001988-05-06
10CONOCO INC.13,3001988-05-02
11CONOCO INC.13,3001988-05-02
13CONOCO INC.13,3001988-05-02
14CONOCO INC.13,3001988-05-02
142-227-00985--------
242-227-00988--------
342-227-00986--------
442-227-00990--------
542-227-00991--------
642-227-10551--------
742-227-10552--------
842-227-10553--------
942-227-10674--------
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