Split-ring riser latch

摘要: A latching and unlatching system for connecting a riser pipe to the casing in subsea well. split-circumferential ring fits into mating grooves male end of female riser. releasing tool runs on drill suspended within has number radially extendible pistons actuated by hydraulic pressure through expand split out groove grooved recess pipe. This releases from connection with so it can then be raised.