COFFIELD B-11 LEASE (T-470)

Oil · District 03 · Lease #12133

Operator: SIERRA MINERALS, INC.

Cum Oil

490 BBL

Cum Gas

0 MCF

Wells

1

Production

1993-01 — 2001-01

Peak Month

1996-09

Production History

Cum Oil: 490 BBL Cum Gas: 0 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

26 BBL/mo

Di (annual)

77.1%

b-factor

0.0

EUR

396 BBL

R-squared

0.747

type

exponential

Operator History (from monthly production reports)

2002-04 — 2006-01 COLE, FRANK W ENGINEERING 46 mo
1996-09 — 2002-03 PETRO DELTA 67 mo
1996-01 — 1996-08 SIERRA MINERALS, INC. 8 mo
1993-04 — 1995-12 AUSTRAL OIL COMPANY INCORPORATED 33 mo
1993-01 — 1993-03 ENERGY RESOURCE MANAGEMENT, INC. 3 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
3COLE FRANK W ENGINEERING13,4001977-12-09