ULS 5-26

Oil · District 08 · Lease #40501

Operator: PIONEER NATURAL RES. USA, INC.

Fields: SPRABERRY (TREND AREA)

Cum Oil

78k BBL

Cum Gas

86k MCF

casinghead

Wells

4

Production

2011-01 — 2026-04

Peak Month

2012-04

Production History

Cum Oil: 77,800 BBL Cum Gas: 86,112 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

1,083 BBL/mo

Di (annual)

23.5%

b-factor

0.0

EUR

55,296 BBL

R-squared

0.749

type

exponential

Operator History (from monthly production reports)

2023-06 — 2026-07 OVINTIV USA INC. 38 mo

2016-12 — 2023-05 PIEDRA OPERATING, LLC 78 mo

2016-09 — 2016-11 PIONEER NATURAL RES. USA, INC. 3 mo

2011-01 — 2016-08 DEVON ENERGY PRODUCTION CO, L.P. 68 mo

Wells (4)

WELL#	API	OPERATOR	PERMITS	DEPTH	LAST_ISSUED
4	42-003-42905	OVINTIV USA INC.	1	11,500	2011-05-09
3	42-003-42643	OVINTIV USA INC.	1	11,500	2011-02-14
2	42-003-42016	OVINTIV USA INC.	2	11,400	2010-08-27
1	42-003-41122	OVINTIV USA INC.	1	11,000	2009-08-12