ERWIN "K"

Oil · District 08 · Lease #37609

Operator: PIONEER NATURAL RES. USA, INC.

Cum Oil

231k BBL

Cum Gas

356k MCF

casinghead

Wells

6

Production

2005-09 — 2026-04

Peak Month

2007-04

Production History

Cum Oil: 231,126 BBL Cum Gas: 356,138 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

2,961 BBL/mo

Di (annual)

23.2%

b-factor

0.3

EUR

211,975 BBL

R-squared

0.865

type

hyperbolic

Operator History (from monthly production reports)

2005-09 — 2026-07 PIONEER NATURAL RES. USA, INC. 251 mo

Wells (6)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4PIONEER NATURAL RES. USA, INC.19,5502006-06-19
8PIONEER NATURAL RES. USA, INC.19,5502006-06-19
2PIONEER NATURAL RES. USA, INC.19,6002006-01-05
3PIONEER NATURAL RES. USA, INC.19,6002006-01-05
5PIONEER NATURAL RES. USA, INC.19,6002006-01-05
1PIONEER NATURAL RES. USA, INC.19,5502005-06-10