دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device placed in the cementing head and run down the casing behind cement to clean the cement off the walls of the casing and to prevent contamination between the cement and the displacement fluid.

n: It located between the drill fluid and slurry,which be used to clear the slurry on the surface of pipe ,and prevent drill fluid polluting slurry.