ETHEL

Oil · District 7C · Lease #17276

Operator: COG OPERATING LLC

Cum Oil

63k BBL

Cum Gas

310k MCF

casinghead

Wells

2

Production

2010-08 — 2025-07

Peak Month

2011-09

Production History

Cum Oil: 62,663 BBL Cum Gas: 309,901 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

1,070 BBL/mo

Di (annual)

90.3%

b-factor

0.8

EUR

42,301 BBL

R-squared

0.465

type

hyperbolic

Operator History (from monthly production reports)

2010-08 — 2025-10 COG OPERATING LLC 183 mo

Wells (2)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
9515COG OPERATING LLC210,8002011-03-21
9514COG OPERATING LLC111,0002011-03-14