KEY (SPRABERRY) UNIT

Oil · District 11 · Lease #66772

Operator: GREAT WESTERN DRILLING COMPANY

Cum Oil

51k BBL

Cum Gas

0 MCF

Wells

9

Production

1993-01 — 2015-08

Peak Month

1994-06

Production History

Cum Oil: 50,524 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

1,099 BBL/mo

Di (annual)

81.3%

b-factor

0.5

EUR

30,943 BBL

R-squared

0.816

type

hyperbolic

Wells (9)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1GREAT WESTERN DRLG. CO.11,2001992-06-24
102GREAT WESTERN DRLG. CO.17,2501991-08-19
202GREAT WESTERN DRLG. CO.17,1001991-08-19
402GREAT WESTERN DRLG. CO.17,1001991-08-19
502GREAT WESTERN DRLG. CO.27,0371991-08-19
201PENWELL ENERGY, INC.28,8001988-08-18
10142-115-10214--------
30142-115-00946--------
40142-115-10258--------
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