WELCH & WELCH

Oil · District 08 · Lease #21859

Operator: PIONEER NATURAL RES. USA, INC.

Cum Oil

33k BBL

Cum Gas

128k MCF

casinghead

Wells

2

Production

1993-01 — 2011-10

Peak Month

1993-07

Production History

Cum Oil: 32,650 BBL Cum Gas: 127,550 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

372 BBL/mo

Di (annual)

12.5%

b-factor

0.0

EUR

35,581 BBL

R-squared

0.648

type

exponential

Operator History (from monthly production reports)

2004-01 — 2013-05 PIONEER NATURAL RES. USA, INC. 113 mo
1993-01 — 2003-12 BROWN, TOM INC. 132 mo

Wells (2)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2PIONEER NATURAL RES. USA INC.19,4251985-09-27
142-317-30119PIONEER NATURAL RES. USA INC.------