Dtc International, Inc.

Chester W Kronke

William C Parks

Dana C Beebe

A modular control system consisting of multiple, remotely retrievable functional modules for controlling a blowout preventer stack. The various functional modules can be located on the lower marine riser package and blowout preventer stack positioned near the equipment with which they are associated, wherein this distribution of modules nearly eliminates the complex interface connection between the lower marine riser package and blowout preventer stack. Each of the functional modules is capable of being installed, retrieved or replaced with a single remotely operated vehicle (ROV) deployment from a vessel. The functional modules can be used to operate as a complete control system for a blowout preventer stack or can be used selectively individually or in various combinations to accommodate multiple control applications or upgrades of other control systems.

Control system for blowout preventer stack

A subsea control module for providing control of subsea equipment is provided. The design allows for replacement and retrieval of a subsea control module with a single remotely operated vehicle ('ROV') deployment from a vessel. The subsea control module can provide distributed electrical and hydraulic control functions via multiple directional control valve modules, multiple pilot valve modules, and a central electronic control module. Each directional control and pilot perform a set of functions so that replacement of a single module does not require disassembly of any other components) or hydraulic connection. Similarly, each pilot valve module can include a set of pilot valves, pressure transducers, solenoids and electronic circuitry to perform a limited set of functions so that failure of a single pilot valve module does not result in failure of the entire subsea control module. The central electronic control module can provide electrical signals to each pilot valve module which can provide hydraulic signals to each directional control valve module and to off-board hydraulics through a subsea equipment receptacle mated with the subsea control module.

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Houston, TX, United States of America

Chester W Kronke