WALLVILLE 321

Oil · District 14 · Lease #8857

Operator: HIGHMARK ENERGY OPERATING, LLC

Cum Oil

156k BBL

Cum Gas

0 MCF

Wells

2

Production

2013-01 — 2026-03

Peak Month

2013-02

Production History

Cum Oil: 155,782 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

3,330 BBL/mo

Di (annual)

72.5%

b-factor

0.7

EUR

138,517 BBL

R-squared

0.682

type

hyperbolic

Wells (2)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
3HEOG RESOURCES, INC.19,0002013-03-07
2HEOG RESOURCES, INC.19,0002012-11-05
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