ZAVISCH

Oil · District 01 · Lease #12066

Operator: WELHAUSEN OPERATING COMPANY, LP

Cum Oil

360k BBL

Cum Gas

1.5M MCF

casinghead

Wells

11

Production

1993-01 — 2026-02

Peak Month

2013-03

Production History

Cum Oil: 359,704 BBL Cum Gas: 1,468,601 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

4,641 BBL/mo

Di (annual)

447.6%

b-factor

1.3

EUR

112,355 BBL

R-squared

0.856

type

hyperbolic

Operator History (from monthly production reports)

2020-05 — 2026-07 GTG OPERATING, LLC 75 mo
2015-04 — 2020-04 CLEARLY PETROLEUM, LLC 61 mo
2013-06 — 2015-03 WAPITI OPERATING, LLC 22 mo
2012-01 — 2013-05 LAYLINE PETROLEUM I, LLC 17 mo
2001-11 — 2011-12 WELHAUSEN OPERATING COMPANY, LP 122 mo
2000-05 — 2001-10 WELHAUSEN OPERATING CO., INC. 18 mo
1994-09 — 2000-04 REGAL PETROLEUM SERVICES 68 mo
1993-01 — 1994-08 SUNDANCE RESOURCES, INC. 20 mo

Wells (11)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
17GTG OPERATING LLC110,8002013-01-15
16GTG OPERATING LLC110,8002012-04-13
15GTG OPERATING LLC110,8002012-03-28
14GTG OPERATING LLC112,0002008-04-10
12GTG OPERATING LLC112,0002008-04-01
6GTG OPERATING LLC110,4001991-05-20
5GTG OPERATING LLC110,4001991-04-04
4GTG OPERATING LLC110,3001990-12-03
3GTG OPERATING LLC110,3001990-06-07
2GTG OPERATING LLC110,5001988-08-03
1GTG OPERATING LLC110,2001988-04-21