Blowout Preventer Rams
Definition - What does Blowout Preventer Rams mean?
Blowout Preventer Rams are devices used to instantly seal the wellhead during a well control event. A single device has a cover with two valves for the well; the valves split down the middle. Large hydraulic cylinders force these valves together in the medium and seal the wellbore. The covers are made up of steel that gives them strength and are fitted on the sealing surface with elastomeric components.
Petropedia explains Blowout Preventer Rams
The cover of a Blowout Preventer is called a ram and the two valves of the blowout preventer are known as ram blocks. When it is extended towards the middle of the wellbore, the ram restricts the flow of fluids and it retracts open to allow the flow of the fluids.The rams and the ram blocks are found with various configurations and they are of four types, i.e., pipe, shear, blind and blind shear. Pine rams are used in a drill pipe to restrict the flow in the annulus. Shear rams are cut through the casing or drill string with hard steel shears. Blind rams do not have any openings for the tubing and closes the well when it does not contain any drill string or tubing. Blind shear rams seal the wellbore even though it has a drill string.