< leases

LOCKHART "A" 36

Oil · District 10 · Lease #4989

Operator: UPLAND RESOURCES, INC.

Fields: FELDMAN (TONKAWA)

Cum Oil

86k BBL

Cum Gas

682k MCF

casinghead

Wells

5

Production

1993-01 — 2025-12

Peak Month

2012-06

Production History

Cum Oil: 85,880 BBL Cum Gas: 682,003 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

2,983 BBL/mo

Di (annual)

65.5%

b-factor

0.3

EUR

77,835 BBL

R-squared

0.820

type

hyperbolic

Operator History (from monthly production reports)

2019-07 — 2026-07 PRESIDIO PETROLEUM LLC 85 mo
2012-05 — 2019-06 APACHE CORPORATION 86 mo
2008-01 — 2012-04 GRANITE OPERATING COMPANY 52 mo
1997-03 — 2007-12 UPLAND RESOURCES, INC. 130 mo
1993-01 — 1997-02 ENRON OIL & GAS COMPANY 50 mo

Wells (5)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
7HC42-211-34995PRESIDIO PETROLEUM LLC18,0002012-01-10
642-211-33530PRESIDIO PETROLEUM LLC212,8002007-04-27
542-211-33302PRESIDIO PETROLEUM LLC111,5002005-05-09
242-211-31462PRESIDIO PETROLEUM LLC17,9001982-02-03
142-211-31407PRESIDIO PETROLEUM LLC17,9001981-10-29