HILL - LONG UNIT

Oil · District 8A · Lease #68638

Operator: SCHALK OIL COMPANY, INC.

Cum Oil

233k BBL

Cum Gas

17 MCF

casinghead

Wells

1

Production

2003-11 — 2026-04

Peak Month

2006-05

Production History

Cum Oil: 233,171 BBL Cum Gas: 17 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

2,610 BBL/mo

Di (annual)

26.4%

b-factor

0.3

EUR

165,218 BBL

R-squared

0.846

type

hyperbolic

Operator History (from monthly production reports)

2003-11 — 2026-07 SCHALK OIL COMPANY, INC. 273 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1SCHALK OIL COMPANY, INC.25,2502003-10-15