KEYSTONE SILURIAN UNIT

Oil · District 10 · Lease #23371

Operator: XTO ENERGY INC.

Cum Oil

192k BBL

Cum Gas

0 MCF

Wells

41

Production

1993-01 — 2019-09

Peak Month

1993-01

Production History

Cum Oil: 192,253 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

1,827 BBL/mo

Di (annual)

16.1%

b-factor

0.5

EUR

218,390 BBL

R-squared

0.838

type

hyperbolic

Wells (41)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
30XTO ENERGY INC.19,9202019-07-12
25WDEVON ENERGY PRODUCTION CO, L.P.19,9982007-08-04
49DEVON ENERGY PRODUCTION CO, L.P.110,0082007-08-04
8BASS ENTERPRISES PRODUCTION CO.18,0301998-11-30
31BASS ENTERPRISES PRODUCTION CO.17,7301998-02-05
37BASS ENTERPRISES PRODUCTION CO.17,9001998-01-02
36BASS ENTERPRISES PRODUCTION CO.17,8901997-09-15
46BC OPERATING, INC.14,6001996-07-02
7PENNZOIL PETROLEUM COMPANY110,0621993-12-09
55PENNZOIL PETROLEUM COMPANY39,8781993-05-18
20GULF OIL CORP.19,7491980-12-30
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