< leases

COLBY, E. H.

Oil · District 03 · Lease #8768

Operator: TEXCAL ENERGY (GP) LLC

Fields: MANVEL (4970)

Cum Oil

913k BBL

Cum Gas

1.5M MCF

casinghead

Wells

4

Production

1993-01 — 2025-11

Peak Month

2015-09

Production History

Cum Oil: 913,308 BBL Cum Gas: 1,522,958 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

5,781 BBL/mo

Di (annual)

12.7%

b-factor

0.2

EUR

655,037 BBL

R-squared

0.548

type

hyperbolic

Operator History (from monthly production reports)

2015-05 — 2026-07 DENBURY ONSHORE, LLC 135 mo
2012-10 — 2015-04 ARGENT ENERGY (US) HOLDINGS INC. 31 mo
2010-05 — 2012-09 ENERGYQUEST II, LLC 29 mo
2007-04 — 2010-04 TEXCAL ENERGY (GP) LLC 37 mo
2006-01 — 2007-03 POGO PRODUCING COMPANY 15 mo
1997-06 — 2005-12 NORTH CENTRAL OIL CORP. 103 mo
1993-01 — 1997-05 CHEVRON U. S. A. INC. 53 mo

Wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1542-039-30759DENBURY ONSHORE, LLC15,2622002-10-11
1042-039-05023DENBURY ONSHORE, LLC15,5151998-07-02
1742-039-32643DENBURY ONSHORE LLC16,2001998-04-20
14 U42-039-30460DENBURY ONSHORE LLC------