دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: A kind of double core barrel drill. The top of inner barrel is hung by ball bearing. It is good for improvement of core recovery if inner barrel does not roll with outer barrel.

v: to pull the drill stem out of the wellbore to change the bit, to change from a core barrel to the bit, to run electric logs, to prepare for a drill stem test, to run casing, and so on. Also called trip out.

n: See trip.

n: Using double core barrel drill to break the annular stone at bottom and keep the central cylindrical core. Cut it down and hoist it to the surface when the length satisfies requirement.

n: A cylindrical rock sample taken from the formation for geological analysis.

a sample of the formation, taken with a core barrel.

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.

n: The whole set of coring tool consisted by outer barrel, inner barrel, safe joint, rotating bearing and core bit.

n: The core barrel used when jetting reversal circulation coring at bottom.