HILL

Oil · District 8A · Lease #68584

Operator: SCHALK OIL COMPANY, INC.

Cum Oil

434k BBL

Cum Gas

22 MCF

casinghead

Wells

2

Production

2003-06 — 2026-04

Peak Month

2003-08

Production History

Cum Oil: 434,277 BBL Cum Gas: 22 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

5,200 BBL/mo

Di (annual)

18.6%

b-factor

0.2

EUR

413,473 BBL

R-squared

0.865

type

hyperbolic

Operator History (from monthly production reports)

2003-06 — 2026-07 SCHALK OIL COMPANY, INC. 278 mo

Wells (2)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2SCHALK OIL COMPANY, INC.15,2002003-06-18
1SCHALK OIL COMPANY, INC.25,2002003-04-18