CASSELMAN

Oil · District 08 · Lease #35587

Operator: GREAT WESTERN DRILLING COMPANY

Cum Oil

174k BBL

Cum Gas

497k MCF

casinghead

Wells

2

Production

1997-11 — 2026-04

Peak Month

1999-07

Production History

Cum Oil: 173,533 BBL Cum Gas: 496,548 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

3,353 BBL/mo

Di (annual)

31.4%

b-factor

0.2

EUR

159,639 BBL

R-squared

0.905

type

hyperbolic

Operator History (from monthly production reports)

2024-11 — 2026-07 BASIN OIL & GAS OPERATING, LLC 21 mo
1997-11 — 2024-10 GREAT WESTERN DRILLING COMPANY 324 mo

Wells (2)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2BASIN OIL & GAS OPERATING, LLC16,5001998-10-14
1BASIN OIL & GAS OPERATING, LLC16,5001997-10-01