Abstract: The present invention relates to an arrangement in a floating drilling and intervention vessel, for controlling a heave compensated drill floor 7 suspended in drill floor compensator cylinders 10. Below the compensated drill floor 7 there is installed a tidal structure (3) suspended in tidal cylinders 2 or wires 25. By adjusting the tidal cylinders 2 or the wires 25 in step with the tide 17 it is achieved that the drill floor compensator cylinders 10 can operate around their middle position regardless of the tide lifting or lowering the vessel 16.

Abstract: The present invention relates to a well head system, especially in connection with high pressure wells, and in order to reduce the weight of steel involved, as well as avoiding unnecessary equipement in the well head, it is according to the present invention suggested a casing programme based on liners, having the same pressure integrity as the casing on which the well head is mounted.

Abstract: The present invention relates to an arrangement in connection with the drilling of oil wells, especially with coil tubing, and more specifically an arrangement comprising heave compensation by such drilling, comprising a first frame-like structure (3) which in relation to a floating vessel (1A) is mounted for allowing movement at least in the vertical direction in relation to said vessel, as well as devices for providing compensating power between said first frame stucture (3) and said vessel (1A), and in order to provide an improved heave compensation system it is according to the present invention suggested that said arrangement further comprising a second frame-like structure (1) arranged stationary on the deck (1AA) of the vessel (1A), said first compensated frame-like structure (3) and said second frame-like structure (1) being assembled by means of a further system (4) allowing compensation of said relative movement between the vessel (1A) and said compensated structure (3), i.e.