ASHLEY "21"

Oil · District 08 · Lease #40438

Operator: ENDEAVOR ENERGY RESOURCES L.P.

Cum Oil

101k BBL

Cum Gas

77k MCF

casinghead

Wells

2

Production

2010-08 — 2026-04

Peak Month

2011-09

Production History

Cum Oil: 101,377 BBL Cum Gas: 77,026 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

2,219 BBL/mo

Di (annual)

95.7%

b-factor

1.1

EUR

121,406 BBL

R-squared

0.771

type

hyperbolic

Operator History (from monthly production reports)

2025-01 — 2026-07 DIAMONDBACK E&P LLC 19 mo
2010-08 — 2024-12 ENDEAVOR ENERGY RESOURCES L.P. 173 mo

Wells (2)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2DIAMONDBACK E&P LLC112,0002010-11-02
1DIAMONDBACK E&P LLC212,0002010-05-11