ERWIN -G-

Oil · District 08 · Lease #22421

Operator: PIONEER NATURAL RES. USA, INC.

Cum Oil

369k BBL

Cum Gas

511k MCF

casinghead

Wells

10

Production

1993-01 — 2026-04

Peak Month

2007-03

Production History

Cum Oil: 369,067 BBL Cum Gas: 510,708 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

3,668 BBL/mo

Di (annual)

18.0%

b-factor

0.4

EUR

366,949 BBL

R-squared

0.733

type

hyperbolic

Operator History (from monthly production reports)

2004-01 — 2026-07 PIONEER NATURAL RES. USA, INC. 271 mo
1993-01 — 2003-12 BROWN, TOM INC. 132 mo

Wells (10)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
12PIONEER NATURAL RES. USA, INC.110,7502010-12-02
10PIONEER NATURAL RES. USA, INC.19,4502006-09-25
8PIONEER NATURAL RES. USA, INC.19,5502006-06-19
7PIONEER NATURAL RES. USA, INC.19,6002006-04-05
9PIONEER NATURAL RES. USA, INC.29,6002006-04-05
5PIONEER NATURAL RES. USA, INC.19,5002004-09-03
4PIONEER NATURAL RES. USA, INC.19,5002004-08-16
142-329-30124PIONEER NATURAL RES. USA, INC.------
242-329-30125PIONEER NATURAL RES. USA, INC.------
342-329-30126PIONEER NATURAL RES. USA, INC.------