SIMPSON-MANN "A"

Oil · District 7C · Lease #12127

Operator: LAWRENCE, C. F. & ASSOC. INC.

Fields: ATKINSON, W. (SAN ANGELO)

Cum Oil

6k BBL

Cum Gas

32 MCF

casinghead

Wells

6

Production

1993-01 — 2026-04

Peak Month

1997-09

Production History

Cum Oil: 6,031 BBL Cum Gas: 32 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

61 BBL/mo

Di (annual)

13.1%

b-factor

0.0

EUR

5,485 BBL

R-squared

0.635

type

exponential

Operator History (from monthly production reports)

2021-06 — 2026-07 CORE PETRO, LLC 62 mo

1996-03 — 2021-05 ARMOR PETROLEUM, INC. 303 mo

1994-08 — 1996-02 EARNEST PRODUCING CORPORATION 19 mo

1993-01 — 1994-07 LAWRENCE, C. F. & ASSOC. INC. 19 mo

Wells (6)

WELL#	API	OPERATOR	PERMITS	DEPTH	LAST_ISSUED
8	42-451-31874	CORE PETRO, LLC	1	1,250	1988-05-04
9	42-451-31853	CORE PETRO, LLC	1	1,250	1988-03-10
10	42-451-31771	CORE PETRO, LLC	1	1,250	1987-04-03
7	42-451-31769	CORE PETRO, LLC	1	1,250	1987-01-12
6	42-451-31757	CORE PETRO, LLC	1	1,250	1986-11-24
5	42-451-31749	CORE PETRO, LLC	1	1,250	1986-09-26