دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device used to remove settlings and cavings that are plugged inside a hollow fish (such as drill pipe) during a fishing operation. It consists of a body inside of which is a hexagonal kelly tipped with a junk mill. It is run on drill pipe to the top of the fish.

n: a kelly with a six-sided (hexagonal) cross section. Compare square kelly. See also kelly.

n: the kelly whose cross section of pipe body is circular inside and hexagon outer

n: a kelly with a four-sided (square) cross section. Compare hexagonal kelly.

n: The drill pipe that outside are square and inner are round.