دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a heavy and relatively short length of pipe that fits in the drill stem between the kelly and the drill pipe. The threads of the drill pipe mate with those of the sub, minimising wear on the kelly.

n: connected with the kelly ,it often suitable make up and breakout.


a short threaded sub that is made up to the kelly and to which the drill string is connected. The connections are made to the sub, saving wear on the kelly threads.