Patents by Inventor Stein Rasmussen

Stein Rasmussen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Dry-tree semi-submersible production and drilling unit
    Patent number: 8807874
    Abstract: A deep draft semi-submersible production and drilling platform unit with dry trees is described. The platform unit preferably comprises four columns, a ring pontoon, a two-axis symmetrical hull with draft in the range of 100 to 155 feet, top-tensioned risers with push or pull tensioners of preferred combined vertical stiffness of 10% to 30% of the platform water plane stiffness, a wellbay with a well spacing in the range of 12 to 18 feet, a riser guiding system supported by the pontoons or at an elevated level, topside facilities supported by a box type of deck structure, mooring lines, and catenary risers.
    Type: Grant
    Filed: April 25, 2011
    Date of Patent: August 19, 2014
    Assignee: Aker Solutions Inc.
    Inventors: Yijian Zeng, Leiv Gunnar Wanvik, Tao Wang, Stein Rasmussen, Renjian Lu
  • DRY-TREE SEMI-SUBMERSIBLE PRODUCTION AND DRILLING UNIT
    Publication number: 20130032076
    Abstract: A deep draft semi-submersible production and drilling platform unit with dry trees is described. The platform unit preferably comprises four columns, a ring pontoon, a two-axis symmetrical hull with draft in the range of 100 to 155 feet, top-tensioned risers with push or pull tensioners of preferred combined vertical stiffness of 10% to 30% of the platform water plane stiffness, a well-bay with a well spacing in the range of 12 to 18 feet, a riser guiding system supported by the pontoons or at an elevated level, topside facilities supported by a box type of deck structure, mooring lines, and catenary risers.
    Type: Application
    Filed: April 25, 2011
    Publication date: February 7, 2013
    Applicant: AKER SUBSEA INC.
    Inventors: Yijian Zeng, Leiv Gunnar Wanvik, Tao Wang, Stein Rasmussen, Renjian Lu