SUBSEA BOP STACK CONTROL SYSTEM

摘要

An improvement is provided in a system for controlling a subsea blowout preventer in which blowout preventer functions are operated by a hydraulic control system. The improvement resides in a control system which has at least two elements and at least one back up control system. The control system includes a subsea pressure compensated reservoir for replenishing the supply of hydraulic fluid, and an electric motor, supplied with electrical command energy from the surface, to operate a hydraulic pump which operates in conjunction with the BOP hydraulic control system. One back up control system is a standby second electric motor, supplied with electrical command energy from the surface, to operate a hydraulic pump which operates in conjunction with the BOP hydraulic control system. A second back up control system is an acoustical unit including a transducer and a subsea acoustic receiver to operate the BOP hydraulic control system drawing hydraulic fluid from the subsea hydraulic accumulators associated with the hydraulic control system. Having two back up, standby systems, enhances the reliability of the BOP control. The total hydraulic control system is housed in a pressure compensated reservoir located at the usual pod locations. Two pods are used for additional redundancy.