دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: The casing float or non-return valve of float shoe, allowing fluid one way flowing from top to bottom through casing.

n: The packer is connected at the suitable part of casing string and trapped in the well to adjust for payzone. There are two non-return valves and a pilot valve. Open the pilot valve when reach to the certain pump pressure in cementing. The cement slurry en

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