CHALK -A-

Oil · District 10 · Lease #2749

Operator: WOOD, MCSHANE & THAMS

Cum Oil

267k BBL

Cum Gas

0 MCF

Wells

16

Production

1993-01 — 2013-03

Peak Month

2001-05

Production History

Cum Oil: 266,974 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

4,482 BBL/mo

Di (annual)

130.1%

b-factor

1.6

EUR

325,911 BBL

R-squared

0.923

type

hyperbolic

Wells (16)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
18VISTA RESOURCES, INC. (A)34,0012001-03-20
14VISTA RESOURCES, INC. (A)34,0012001-02-21
4VISTA RESOURCES, INC. (A)34,0012001-02-21
9PRIZE OPERATING COMPANY14,0012001-02-21
59WPRIZE OPERATING COMPANY13,5002001-02-14
8VISTA RESOURCES, INC. (A)13,5001998-12-10
15VISTA RESOURCES, INC. (A)14,0001998-01-16
12VISTA RESOURCES, INC. (A)14,0001998-01-15
10VISTA RESOURCES, INC. (A)14,0001997-11-18
17VISTA RESOURCES, INC. (A)23,8001997-03-10
1142-227-02288--------
242-227-02280--------
5W42-227-02283--------
642-227-02284--------
742-227-02285--------
7W42-227-30204--------
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