Patent ID: 8540460

Claim:
A riser management system for maintaining a selected range of tension on a plurality of risers extending between subsea well equipment and a moored floating vessel, the riser management system comprising: a mono-buoyancy can platform operably coupled to a plurality of tensioner units, configured to be at least partially submerged, and positioned within and circumscribed by substantial portions of a passageway extending through submerged portions of a hull of a moored floating vessel to provide tension to each of a plurality of risers extending therethrough and between subsea well equipment and the moored floating vessel to collectively compensate for a relative vertical offset between the plurality of risers and the floating vessel during sustained operational employment of the riser management system, the relative vertical offset defining a first factor, the mono-buoyancy can platform being substantially laterally constrained within at least the substantial portions of the passageway extending through the submerged portions of the hull of the moored floating vessel; the plurality of tensioner units each connected to a top portion of a separate one of the plurality of risers to separately adjust stroke position and to separately provide tension within a preselected range of tension values to each separate one of the plurality of risers to compensate for differential effects of one or more additional factors other than the first factor on one or more of the plurality of risers during sustained operational employment of the riser management system, each of the plurality of tensioner units comprising a plurality of cylinders having a first end portion operably coupled to a riser connector for a respective one of the plurality of risers and a second end portion operably coupled to the mono-buoyancy can platform, each of the plurality of risers coupled to a corresponding different one of the plurality of tensioner units to thereby move independently within an internal structure of the mono-buoyancy can platform.