CASS-ERNEST E20O

Oil · District 08 · Lease #51839

Operator: PIONEER NATURAL RES. USA, INC.

Cum Oil

355k BBL

Cum Gas

1.1M MCF

casinghead

Wells

1

Production

2019-02 — 2026-04

Peak Month

2019-05

Production History

Cum Oil: 354,632 BBL Cum Gas: 1,057,541 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

7,749 BBL/mo

Di (annual)

34.0%

b-factor

0.0

EUR

273,066 BBL

R-squared

0.488

type

exponential

Operator History (from monthly production reports)

2019-02 — 2026-07 PIONEER NATURAL RES. USA, INC. 90 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
15HPIONEER NATURAL RES. USA, INC.110,4502018-07-17