Patent ID: 8393397

Claim:
A method for separating a tubular string from a subsea well installation operably associated with a subsea well, the method comprising: placing the tubular string in tension; generating an output signal with a subsea controller responsive to a predetermined input signal received by the subsea controller; receiving the output signal at a subsea actuator assembly and applying the tension force to the subsea actuator assembly; energizing fluid in an operating fluid delivery subsystem in fluid communication with subsea actuator assembly and a retainer valve, a shut-in valve assembly, a vent sleeve and a latch assembly; and actuating the retainer valve, the shut-in valve assembly, the vent sleeve and the latch assembly responsive to the energized fluid including, closing the retainer valve, closing the shut-in valve assembly, opening the vent sleeve and energizing an unlatch mechanism in the latch assembly, thereby preventing fluid loss from the tubular, shutting in the well, bleeding off pressure between the retainer valve and the shut-in valve assembly and separating the tubular string from the subsea well installation.