GUITAR COSTILLA 5

Oil · District 08 · Lease #39373

Operator: PIONEER NATURAL RES. USA, INC.

Fields: SPRABERRY (TREND AREA)

Cum Oil

17k BBL

Cum Gas

31k MCF

casinghead

Wells

1

Production

2008-05 — 2025-01

Peak Month

2008-08

Production History

Cum Oil: 16,501 BBL Cum Gas: 30,807 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

548 BBL/mo

Di (annual)

68.6%

b-factor

0.5

EUR

18,109 BBL

R-squared

0.632

type

hyperbolic

Operator History (from monthly production reports)

2021-02 — 2026-07 PIONEER NATURAL RES. USA, INC. 66 mo

2017-05 — 2021-01 PARSLEY ENERGY OPERATIONS, LLC 45 mo

2017-02 — 2017-04 DE OPERATING LLC 3 mo

2008-05 — 2017-01 COBRA OIL & GAS CORPORATION 105 mo

Wells (1)

WELL#	API	OPERATOR	PERMITS	DEPTH	LAST_ISSUED
1R	42-227-34864	FASKEN BARBARA	2	10,500	2008-01-07