Patents Assigned to Aker Riser Systems AS
  • Riser
    Patent number: 7163062
    Abstract: A riser for conveying fluids from a subsea location to a surface vessel comprises an upper section which is located in a confining conduit, said upper section being allowed to deform elastically into a helical configuration against the inside of the confining conduit when subjected to axial compression. The riser further comprises a main section extending below the confining conduit to said subsea location. The riser also comprises a buoyancy arrangement which keeps the main section in tension. This arrangement allows the Christmas tree to be supported directly on the deck of the surface structure and allows the surface structure to support the weight of the tree as well as the tubing which is hung off from the tree.
    Type: Grant
    Filed: May 28, 2004
    Date of Patent: January 16, 2007
    Assignee: Aker Riser Systems AS
    Inventor: Arne Sele
  • Riser
    Publication number: 20050006101
    Abstract: A riser for conveying fluids from a subsea location to a surface vessel comprises an upper section which is located in a confining conduit, said upper section being allowed to deform elastically into a helical configuration against the inside of the confining conduit when subjected to axial compression. The riser further comprises a main section extending below the confining conduit to said subsea location. The riser also comprises a buoyancy arrangement which keeps the main section in tension. This arrangement allows the Christmas tree to be supported directly on the deck of the surface structure and allows the surface structure to support the weight of the tree as well as the tubing which is hung off from the tree.
    Type: Application
    Filed: May 28, 2004
    Publication date: January 13, 2005
    Applicant: Aker Riser Systems AS
    Inventor: Arne Sele
  • Hybrid riser configuration
    Patent number: 6837311
    Abstract: Hybrid riser configuration comprising a plurality of steel riser pipes substantially inserted in aluminium guide conduits, with buoyancy means and tethering tension means, the guide conduits and riser pipes being rigidly connected to a base anchored to the ocean floor. The guide conduits serve as the tethering tension means and as radial constraint for the respective riser pipe therein to allow the riser pipe to buckle in elastic deformation (Euler) to form a spiral when expanding due to service pressure and temperature. A method for installing the riser configuration is also disclosed.
    Type: Grant
    Filed: August 24, 2000
    Date of Patent: January 4, 2005
    Assignee: Aker Riser Systems AS
    Inventors: Arne Sele, Magne Nygard