SOUTH KEYSTONE /ELLEN/ UNIT

Oil · District 10 · Lease #22615

Operator: STRONGHOLD ENERGY II OPER, LLC

Cum Oil

1.6M BBL

Cum Gas

0 MCF

Wells

38

Production

1993-01 — 2026-03

Peak Month

2007-03

Production History

Cum Oil: 1,613,190 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

19,032 BBL/mo

Di (annual)

128.6%

b-factor

0.5

EUR

344,547 BBL

R-squared

0.789

type

hyperbolic

Wells (38)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1073DEVON ENERGY PRODUCTION CO, L.P.19,8422011-11-18
1402DEVON ENERGY PRODUCTION CO, L.P.110,0082007-08-04
701DEVON ENERGY PRODUCTION CO, L.P.19,9982007-08-04
1121DEVON ENERGY PRODUCTION CO, L.P.110,1002006-08-17
1064RPENNZOIL PETROLEUM COMPANY110,0621993-12-09
3004RPENNZOIL PETROLEUM COMPANY110,3001993-10-04
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