Blowout preventer shearing and sealing rams

摘要

Rams are provided in a blowout preventer to shear the drill string and seal the well bore should the need arise. Two shearing rams have cutting blades which shear the drill pipe. A seal member is mounted behind one of the cutting blades and is adapted to move into sealing position after shearing has occurred. Elastsomer flow into areas where there has been damage to the seal member is permitted by the design of the seal member.