ROBINSON

Oil · District 8A · Lease #68589

Operator: SCHALK OIL COMPANY, INC.

Cum Oil

227k BBL

Cum Gas

22 MCF

casinghead

Wells

1

Production

2003-06 — 2026-04

Peak Month

2003-10

Production History

Cum Oil: 227,455 BBL Cum Gas: 22 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

2,609 BBL/mo

Di (annual)

13.8%

b-factor

0.0

EUR

226,782 BBL

R-squared

0.804

type

exponential

Operator History (from monthly production reports)

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

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2SCHALK OIL COMPANY, INC.15,3002003-05-20