MANSFIELD "CS"

Oil · District 10 · Lease #4543

Operator: STEPHENS & JOHNSON OPERATING CO.

Cum Oil

296k BBL

Cum Gas

29k MCF

casinghead

Wells

3

Production

1993-01 — 2026-04

Peak Month

1993-01

Production History

Cum Oil: 295,829 BBL Cum Gas: 29,365 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

3,480 BBL/mo

Di (annual)

32.7%

b-factor

0.7

EUR

281,095 BBL

R-squared

0.807

type

hyperbolic

Operator History (from monthly production reports)

2007-12 — 2026-07 STEPHENS & JOHNSON OPERATING CO. 224 mo
2005-07 — 2007-11 MEXTEX OPERATING COMPANY 29 mo
2001-12 — 2005-06 EXTEX OPERATING COMPANY 43 mo
1993-01 — 2001-11 RIO PETROLEUM, INC. 107 mo

Wells (3)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
7STEPHENS & JOHNSON OPERATING CO.16,7001992-08-24
3STEPHENS & JOHNSON OPERATING CO.17,2001981-08-31
1STEPHENS & JOHNSON OPERATING CO.17,2001980-01-29