Patent ID: 8413724
Filing Date: 2013-04-09
Classification: A61N,E21B,Y10T

Abstract:
1. A riser assembly to be used in underwater oil and gas exploration, the riser assembly comprising: a riser having a lower end and an upper end and a central conduit extending from the lower end to the upper end; a gas handier connected to the riser and provided between the lower end and the upper end, the gas handier having an external casing, a central passage within the external casing in fluid communication with the central conduit, as elastomeric body surrounding the passage that is movable by a piston to a closed position blocking upward flow through the central that selectively blocks and opens fluid communication between the central passage and the gas vent conduit; plural pipes attached to an outside of the riser such that at least one of the plural pipes has a flow path that passes within and through the external casing alongside the central passage; and a gas vent pipe configured to start at the gas vent conduit of the gas handler and extend towards the upper end of the riser, and the gas vent pipe is further configured to divert a gas from the gas handler through the outside of the riser.