UPTON -N- FEE

Oil · District 7C · Lease #14700

Operator: STEPHENS, AUTRY C.

Cum Oil

254k BBL

Cum Gas

448k MCF

casinghead

Wells

4

Production

1997-12 — 2026-04

Peak Month

1999-12

Production History

Cum Oil: 253,669 BBL Cum Gas: 447,739 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

3,136 BBL/mo

Di (annual)

150.6%

b-factor

1.8

EUR

246,499 BBL

R-squared

0.609

type

hyperbolic

Operator History (from monthly production reports)

2025-01 — 2026-07 DIAMONDBACK E&P LLC 19 mo
2000-09 — 2024-12 ENDEAVOR ENERGY RESOURCES L.P. 292 mo
1997-12 — 2000-08 STEPHENS, AUTRY C. 33 mo

Wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
8DIAMONDBACK E&P LLC111,0001998-05-27
7DIAMONDBACK E&P LLC111,0001998-05-08
5DIAMONDBACK E&P LLC111,0001997-07-03
6DIAMONDBACK E&P LLC111,0001997-07-03