دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: Small drilling rig for coring.

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 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.

n: a bit that does not drill out the centre portion of the hole, but allows this centre portion (the core) to pass through the round opening in the centre of the bit and into the core barrel.

n: The drill bit that breaks the annular rock at bottom and matchs with coring tool.