RINEHART A

Oil · District 8A · Lease #68727

Operator: SCHALK OIL COMPANY, INC.

Cum Oil

120k BBL

Cum Gas

3 MCF

casinghead

Wells

1

Production

2004-12 — 2026-04

Peak Month

2005-04

Production History

Cum Oil: 120,498 BBL Cum Gas: 3 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

3,116 BBL/mo

Di (annual)

147.2%

b-factor

1.0

EUR

109,568 BBL

R-squared

0.727

type

hyperbolic

Operator History (from monthly production reports)

2004-12 — 2026-07 SCHALK OIL COMPANY, INC. 260 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1SCHALK OIL COMPANY, INC.15,4002004-11-03