WASHINGTON WEST D 23-14

Oil · District 7C · Lease #21257

Operator: PIONEER NATURAL RES. USA, INC.

Cum Oil

111k BBL

Cum Gas

1.3M MCF

casinghead

Wells

1

Production

2021-02 — 2026-04

Peak Month

2021-07

Production History

Cum Oil: 110,799 BBL Cum Gas: 1,332,745 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

10,313 BBL/mo

Di (annual)

581.0%

b-factor

0.8

EUR

79,661 BBL

R-squared

0.728

type

hyperbolic

Operator History (from monthly production reports)

2021-06 — 2026-07 PIONEER NATURAL RES. USA, INC. 62 mo
2021-02 — 2021-05 DE3 OPERATING LLC 4 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4404HPIONEER NATURAL RES. USA, INC.29,5002019-04-16