دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a check valve installed in the drill stem that allows mud to be pumped down the drill stem but prevents flow back up the drill stem. Also called a float.

n: a non-return valve joined in the pipe , it can only let the fluid into the bottom of the well from the drill pipe but cant let the fluid return into the dill pipe from the bottom