Patents Assigned to Heerema Group Services B.V.
  • Method and device for drilling for oil or gas
    Patent number: 5647443
    Abstract: In a method and device for drilling for oil or gas in an underwater bed by means of a drilling rig with a drilling derrick disposed on a floating drilling platform or on an underwater bed, prior to the placing of a casing string, the placing of a riser string or the drilling of a hole, one or more parts of the casing string, the riser string or the drill string are pre-assembled on the drilling rig at one or more pre-assembly points which are in a position which is different from the position of the drilling derrick.
    Type: Grant
    Filed: July 19, 1995
    Date of Patent: July 15, 1997
    Assignee: Heerema Group Services B.V.
    Inventor: Rene Broeder
  • Hoisting devices
    Patent number: 5114026
    Abstract: A hoisting device comprises a cable controlled at one end by a conventional crane winch assembly and at the other end by a traction winch assembly comprising traction device and storage winch. The hook is raised and lowered using the crane winch assembly and/or traction winch assembly depending upon whether the operation requires critical control or long haul travel.
    Type: Grant
    Filed: October 30, 1990
    Date of Patent: May 19, 1992
    Assignee: Heerema Group Services B.V.
    Inventor: Van Ketel Hendrik