ROBINSON

Oil · District 8A · Lease #68561

Operator: SCHALK OIL COMPANY, INC.

Cum Oil

127k BBL

Cum Gas

23 MCF

casinghead

Wells

1

Production

2003-04 — 2020-04

Peak Month

2004-07

Production History

Cum Oil: 127,256 BBL Cum Gas: 23 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

3,009 BBL/mo

Di (annual)

78.1%

b-factor

0.3

EUR

65,813 BBL

R-squared

0.851

type

hyperbolic

Operator History (from monthly production reports)

2003-04 — 2023-06 SCHALK OIL COMPANY, INC. 243 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1SCHALK OIL COMPANY INC.15,2002003-03-12