CLARK -7-

Oil · District 08 · Lease #20270

Operator: STEPHENS, AUTRY C.

Fields: SPRABERRY (TREND AREA)

Cum Oil

100k BBL

Cum Gas

536k MCF

casinghead

Wells

3

Production

1993-01 — 2026-04

Peak Month

1993-04

Production History

Cum Oil: 100,183 BBL Cum Gas: 536,297 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

644 BBL/mo

Di (annual)

8.2%

b-factor

0.0

EUR

93,049 BBL

R-squared

0.640

type

exponential

Operator History (from monthly production reports)

2025-06 — 2026-07 DE V OPERATING, LLC 14 mo

2025-01 — 2025-05 DIAMONDBACK E&P LLC 5 mo

2000-09 — 2024-12 ENDEAVOR ENERGY RESOURCES L.P. 292 mo

1993-08 — 2000-08 STEPHENS, AUTRY C. 85 mo

1993-01 — 1993-07 HOUSTON OIL & MINERALS CORP. 7 mo

Wells (3)

WELL#	API	OPERATOR	PERMITS	DEPTH	LAST_ISSUED
3R	42-173-32183	DE V OPERATING, LLC	1	8,400	1991-09-05
4	42-173-32175	DE V OPERATING, LLC	1	8,400	1991-07-18
2	42-173-30124	DE V OPERATING, LLC	--	--	--