BLOWOUT PREVENTER Russian patent published in 1994 - IPC

FIELD: well drilling. SUBSTANCE: blowout prevented has universal drive of its pipe rams to solve the following problems: provision of synchronous forced motion of rams to pipe string and back in operation under standard and emergency conditions to exclude bending and breakage of pipe string; instantaneous changing over of drive operation from hydraulic or pneumatic energy carrier to emergency drive with no auxiliary operations; constant monitoring of preventer pipe rams position by automatic indicator, and reduction of horizontal dimensions. Said problems are solved due to application of synchronizer of rams motion, reversing of rams drive, and indicator of rams location. EFFECT: higher efficiency. 2 dwg