COLE RANCH "40"

Oil · District 08 · Lease #38170

Operator: REEF EXPLORATION, L.P.

Cum Oil

36k BBL

Cum Gas

69k MCF

casinghead

Wells

2

Production

2007-05 — 2026-04

Peak Month

2007-08

Production History

Cum Oil: 35,713 BBL Cum Gas: 69,121 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

1,048 BBL/mo

Di (annual)

78.9%

b-factor

0.6

EUR

35,145 BBL

R-squared

0.798

type

hyperbolic

Operator History (from monthly production reports)

2019-02 — 2026-07 DIAMONDBACK E&P LLC 90 mo
2011-07 — 2019-01 ENERGEN RESOURCES CORPORATION 91 mo
2007-05 — 2011-06 REEF EXPLORATION, L.P. 50 mo

Wells (2)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2DIAMONDBACK E&P LLC18,7502007-01-04
1DIAMONDBACK E&P LLC28,7502006-12-11