Patent ID: 9419288
Filing Date: 2016-08-16
CPC Classification: B60L,E21B,H01M

Claim Text:
1. In a blowout preventer having a tubular bore protector interconnected between a wellhead and a riser in a petroleum well, the blowout preventer having a shearing ram powered by a hydraulic system including a hydraulic pump driven by an electric motor connected to a primary battery, and a control interconnected between the electric motor and the primary battery for actuating the electric motor to move the shearing ram to deform and seal the tubular bore protector to prevent a blowout from the wellhead, the improvement comprising: a thermal battery having: an anode and a cathode connector directly connecting said anode and cathode to the electric motor of the blowout preventer; an isolator preventing electrical current front flowing from said thermal battery into the primary battery; a low power internal battery; and a thermal battery actuator connecting said low power internal battery to said electrically operated primer for actuating said thermal battery upon imminent blowout from the wellhead and upon failure of said primary battery to power the electric motor for preventing a blowout from the wellhead.