DEAN "C"

Oil · District 8A · Lease #5981

Operator: WESTPORT OIL AND GAS COMPANY, LP

Fields: SLAUGHTER

Cum Oil

133k BBL

Cum Gas

165k MCF

casinghead

Wells

14

Production

1993-01 — 2026-04

Peak Month

1995-06

Production History

Cum Oil: 133,050 BBL Cum Gas: 165,170 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

1,420 BBL/mo

Di (annual)

16.5%

b-factor

0.3

EUR

139,133 BBL

R-squared

0.973

type

hyperbolic

Operator History (from monthly production reports)

2025-10 — 2026-07 EXTEX OPERATING COMPANY 10 mo
2022-01 — 2025-09 NEW HORIZON RESOURCES LLC 45 mo
2020-05 — 2021-12 EXTEX OPERATING COMPANY 20 mo
2019-09 — 2020-04 GRIZZLY OP OF DELAWARE, LLC 8 mo
2015-05 — 2019-08 VANGUARD OPERATING, LLC 52 mo
2012-04 — 2015-04 VANGUARD PERMIAN, LLC 37 mo
2009-09 — 2012-03 ENCORE ENERGY PARTNERS OPER LLC 31 mo
2005-12 — 2009-08 ENCORE OPERATING, L.P. 45 mo
2002-03 — 2005-11 WESTPORT OIL AND GAS COMPANY, LP 45 mo
1998-09 — 2002-02 BELCO ENERGY CORP. 42 mo
1995-01 — 1998-08 CODA ENERGY, INC. 44 mo
1993-01 — 1994-12 MOBIL PRODUCING TX. & N.M. INC. 24 mo

Wells (14)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
12EXTEX OPERATING COMPANY15,1001985-08-14
13EXTEX OPERATING COMPANY15,1001985-08-14
3AEXTEX OPERATING COMPANY15,2001985-04-29
142-079-01413EXTEX OPERATING COMPANY------
1042-079-30209EXTEX OPERATING COMPANY------
1142-079-30208EXTEX OPERATING COMPANY------
1WS42-079-01413EXTEX OPERATING COMPANY------
2W42-079-01417EXTEX OPERATING COMPANY------
4W42-079-01425EXTEX OPERATING COMPANY------
542-079-01429EXTEX OPERATING COMPANY------
6W42-079-01432EXTEX OPERATING COMPANY------
7W42-079-01433EXTEX OPERATING COMPANY------
842-079-01434EXTEX OPERATING COMPANY------
942-079-30136EXTEX OPERATING COMPANY------