WINDHAM "4"

Oil · District 08 · Lease #33574

Operator: STEPHENS, AUTRY C.

Cum Oil

390k BBL

Cum Gas

803k MCF

casinghead

Wells

5

Production

1993-01 — 2026-04

Peak Month

1994-10

Production History

Cum Oil: 389,781 BBL Cum Gas: 803,370 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

2,576 BBL/mo

Di (annual)

9.7%

b-factor

0.1

EUR

343,559 BBL

R-squared

0.895

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
1993-01 — 2000-08 STEPHENS, AUTRY C. 92 mo

Wells (5)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
5DIAMONDBACK E&P LLC210,2001996-03-20
4DIAMONDBACK E&P LLC210,2501994-04-05
3DIAMONDBACK E&P LLC19,9801993-03-19
2DIAMONDBACK E&P LLC19,8001992-11-20
1DIAMONDBACK E&P LLC19,8001992-08-21