Upper termination with sliding sleeve seals

摘要

A supporting connection system for a riser extending between a floating vessel and a subsea well utilizes a termination head that removably fits within a termination housing. The termination head and housing have radial ports that register with each other to transmit fluid between the vessel and the subsea well. A sliding sleeve is located in the radial port of the termination housing. The sleeve is reciprocated by hydraulic pressure between an open position removed from the termination head and a closed position with its forward end located inside the termination head radial passage. The forward end of the sliding sleeve seals within the termination head passage.