FPSO Field Development System for Large Riser Count and High Pressures for Harsh Environments

Abstract

In an offshore production system, a semisubmersible supports the risers and provides the service requirements for the wells, while an associated FPSO provides the processing functions and storage of the produced hydrocarbons. As a result, a greater number of risers can be supported in a harsh environment while the turret and swivel requirements of the system are significantly reduced.

What is claimed is: 
     
         1 . An offshore oilfield development system comprising:
 a semisubmersible having equipment for water and/or gas injection, chemical injection, and manifolding;   a plurality of subsea risers in fluid connection with the equipment on the semisubmersible and wellheads on the seafloor; and   a submersible mooring buoy having means for mooring an FPSO said means including means for fluid transfer from the mooring buoy to an FPSO moored thereto; and   at least one fluid conduit connecting the mooring buoy to the subsea risers via the semisubmersible.