Patent ID: 8725302

Claim:
A control system for completion installation, intervention and testing activities at a subsea location, the control system comprising: a first control circuit at a surface location; a subsea test tree located in a blowout preventer at the subsea location; a second control circuit located within a riser extending from the blowout preventer towards the surface location, the second control circuit configured to communicate with the first control circuit; and a plurality of sensors monitoring characteristics of the subsea location, the second control circuit receiving the characteristics; wherein the second control circuit is configured to electrically actuate fully electrically powered subsea valves based upon commands from the first control circuit and based upon the characteristics of the subsea location to complete one of a completion installation, intervention and testing activity; wherein the subsea valves are actuatable in response to a first disconnect command from the first control circuit to the second control circuit and wherein the subsea valves are actuated by a plurality of electrically powered disconnect valve drivers; and wherein a second disconnect command bypasses the second control circuit and any other circuit located at a subsea location to actuate a set of valve drivers that actuate the subsea valves.