PREVENTER Russian patent published in 2010 - IPC E21B33/06 

FIELD: oil-and-gas industry.

SUBSTANCE: equipment contains a case with a vertical axial channel and a horizontal cavity, where movable rams installed, ram's hydraulic drive includes hydraulic cylinder, manual drive and the manual drive and the hydraulic cylinder kinematical connection unit. The kinematical connection unit includes a barrel, installed on a screw tip with rotation ability and a stop block. The barrel has through holes perpendicular to axis, in quantity not less than four, interacting with the stop block. The hydraulic cylinder drive includes a piston, a rod and a cup, connected to a case with a nut at the end, which interacts with the screw. The hydraulic cylinder rod's end has through hole perpendicular to axis, interacting with the barrels through hole and the stop block. Case walls in a vertical plane additionally has diametrically opposed though holes, which length is greater than ram stroke.

EFFECT: kinematical connection unit improvement allows to cut time consumed for ram's opening-shutting operations, when it is necessary to switch from the hydraulic drive to the manual one, provides the preventer operation reliability, allows to avoid collection of a drilling agent remaining and precipitations in the case cavity, increase operation safety.

5 dwg