< leases

SOUTH TEXAS SYNDICATE

Oil · District 01 · Lease #4191

Operator: THALMANN, DAVID VAC SERVICE INC

Fields: WASHBURN RANCH (5450)

Cum Oil

65k BBL

Cum Gas

59k MCF

casinghead

Wells

7

Production

1993-01 — 2016-08

Peak Month

1993-05

Production History

Cum Oil: 64,990 BBL Cum Gas: 58,590 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

422 BBL/mo

Di (annual)

5.7%

b-factor

0.0

EUR

84,348 BBL

R-squared

0.339

type

exponential

Operator History (from monthly production reports)

2019-01 — 2026-07 OILTON RESOURCES, INC. 91 mo
2015-08 — 2018-12 MARTINEAU PETROLEUM, INC. 41 mo
2011-03 — 2015-07 TEXOKAN OPERATING, INC. 53 mo
2010-04 — 2011-02 STONEGATE OPERATORS, INC. 11 mo
2006-11 — 2010-03 BOTASCH OPERATING, LLC 41 mo
2002-06 — 2006-10 THALMANN, DAVID VAC SERVICE INC 53 mo
1995-02 — 2002-05 NULL, W.M. OPERATIONS, INC. 88 mo
1993-01 — 1995-01 BASS ENTERPRISES PRODUCTION CO. 25 mo

Wells (7)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
870742-283-30115NULL W.M. OPERATIONS INC.45,7182000-01-19
8707 E42-283-30115NULL W.M. OPERATIONS INC.45,7182000-01-19
8707E42-283-30115NULL W.M. OPERATIONS INC.45,7182000-01-19
8701 E42-283-30100OILTON RESOURCES INC.25,5501997-11-18
8701E42-283-30100OILTON RESOURCES INC.25,5501997-11-18
8706 E42-283-30113OILTON RESOURCES INC.------
8706E42-283-30113OILTON RESOURCES INC.------