دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a length of pipe inside the swivel that is installed to the swivels washpipe and to which the kelly (or a kelly accessory, such as the upper kelly cock) is attached. It conducts drilling mud from the washpipe and to the drill stem. See washpipe.

n: The rotary carrying pipe fittings in the swivel,its shoulder sitting on the main bearing and join with kelly bar by nipple.