CHALK -B- DUNCAN

Oil · District 10 · Lease #41227

Operator: CONOCOPHILLIPS COMPANY

Cum Oil

25k BBL

Cum Gas

0 MCF

Wells

6

Production

2011-12 — 2017-02

Peak Month

2012-04

Production History

Cum Oil: 25,311 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

1,533 BBL/mo

Di (annual)

218.1%

b-factor

1.1

EUR

46,129 BBL

R-squared

0.785

type

hyperbolic

Wells (6)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
5WCONOCO INC.13,3501988-05-20
7CONOCO INC.13,2001988-05-18
8CONOCO INC.13,2001988-05-18
1W42-227-00987--------
2W42-227-00989--------
342-227-10123--------
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