OBRIEN, J. M.

Oil · District 02 · Lease #3984

Operator: SOUTH TEXAS OPERATING COMPANY

Fields: GRETA (4400)

Cum Oil

100k BBL

Cum Gas

123k MCF

casinghead

Wells

5

Production

1993-01 — 2012-12

Peak Month

1998-07

Production History

Cum Oil: 100,349 BBL Cum Gas: 122,593 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

977 BBL/mo

Di (annual)

10.8%

b-factor

0.0

EUR

107,846 BBL

R-squared

0.460

type

exponential

Operator History (from monthly production reports)

2023-05 — 2026-07 SOUTH TEXAS OPERATING COMPANY 39 mo
2022-06 — 2023-04 JURA ENERGY OPERATING LLC 11 mo
2020-07 — 2022-05 HUGHES LEGACY LLC 23 mo
2006-08 — 2020-06 JOSEY OIL COMPANY, LTD. 167 mo
2001-09 — 2006-07 JOSEY OIL COMPANY 59 mo
1998-01 — 2001-08 JOY RESOURCES, INC. 44 mo
1993-01 — 1997-12 JOSEY, LENOIR M., INC. 60 mo

Wells (5)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2SOUTH TEXAS OPERATING COMPANY13,9001997-03-18
142-391-01033SOUTH TEXAS OPERATING COMPANY------
442-391-01036SOUTH TEXAS OPERATING COMPANY------
742-391-01039SOUTH TEXAS OPERATING COMPANY------
942-391-00962SOUTH TEXAS OPERATING COMPANY------