Steel production riser, offshore hydrocarbon production system, and method of producing a hydrocarbon stream

摘要

A steel production riser (100) provided with an auxiliary buoyancy section (106) around the touchdown point (115) wherein the production riser is provided with a first set of external buoyancy modules. As a result of the first set of external buoyancy modules, the upward buoyancy force on the auxiliary buoyancy section in the body of water is smaller than the downward gravity force. The touchdown point is located within the auxiliary buoyancy section. The steel production riser may be used in a method for producing a hydrocarbon stream, whereby mineral hydrocarbon fluids produced from a subsea hydrocarbon reservoir are conveyed to a floating structure via the steel production riser.