دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a tubular device, usually from 10 to 60 feet (3 to 18 metres) long, run at the bottom of the drill pipe in place of a bit and used to cut a core sample.

n: A special tool installed at the bottom of the drill string to cut and retain a core sample that is then recovered when the string is pulled out of the hole.

a barrel in the drilling BHA with a coring head designed to receive a rock core cut as part of core sampling operations.