BLACKARD "A"

Oil · District 8A · Lease #65621

Operator: MARSHALL & WINSTON, INC.

Cum Oil

155k BBL

Cum Gas

182k MCF

casinghead

Wells

1

Production

1993-01 — 2026-03

Peak Month

2004-09

Production History

Cum Oil: 155,383 BBL Cum Gas: 181,639 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

713 BBL/mo

Di (annual)

7.3%

b-factor

0.4

EUR

144,906 BBL

R-squared

0.614

type

hyperbolic

Operator History (from monthly production reports)

2013-11 — 2026-07 ESTANCIA OIL & GAS, LLC 153 mo
2012-09 — 2013-10 ENERVEST OPERATING, L.L.C. 14 mo
2007-09 — 2012-08 CHESAPEAKE OPERATING, INC. 60 mo
1993-01 — 2007-08 MARSHALL & WINSTON, INC. 176 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2ESTANCIA OIL & GAS, LLC410,0002004-04-23