SOUTHLAND -B-

Oil · District 10 · Lease #1643

Operator: WO OPERATING COMPANY

Cum Oil

20k BBL

Cum Gas

146k MCF

casinghead

Wells

4

Production

1993-01 — 2017-01

Peak Month

2002-01

Production History

Cum Oil: 19,550 BBL Cum Gas: 146,495 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

243 BBL/mo

Di (annual)

56.9%

b-factor

0.7

EUR

12,436 BBL

R-squared

0.581

type

hyperbolic

Operator History (from monthly production reports)

2019-01 — 2026-07 LARGE OPERATING LLC 91 mo
1999-09 — 2018-12 WO OPERATING COMPANY 232 mo
1998-04 — 1999-08 CHESAPEAKE OPERATING, INC. 17 mo
1993-02 — 1998-03 HUGOTON ENERGY CORPORATION 62 mo
1993-01 — 1993-01 OXY USA INC. 1 mo

Wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
6WO OPERATING COMPANY23,1422001-12-21
142-233-00551LARGE OPERATING LLC------
242-233-00554LARGE OPERATING LLC------
442-233-00558LARGE OPERATING LLC------