CHIEFTAIN

Oil · District 08 · Lease #39840

Operator: VENCER ENERGY, LLC

Cum Oil

35k BBL

Cum Gas

56k MCF

casinghead

Wells

1

Production

2010-03 — 2025-03

Peak Month

2010-05

Production History

Cum Oil: 34,858 BBL Cum Gas: 55,972 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

793 BBL/mo

Di (annual)

33.4%

b-factor

0.2

EUR

35,489 BBL

R-squared

0.650

type

hyperbolic

Operator History (from monthly production reports)

2024-01 — 2026-07 CIVITAS PERMIAN OPERATING, LLC 31 mo
2021-08 — 2023-12 VENCER ENERGY, LLC 29 mo
2020-06 — 2021-07 HUNT OIL COMPANY 14 mo
2010-03 — 2020-05 PIONEER NATURAL RES. USA, INC. 123 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1CIVITAS PERMIAN OPERATING LLC19,5002009-11-17