Patent ID: 9388649
Filing Date: 2016-07-12
CPC Classification: B63B,E21B

Claim Text:
1. Offshore drilling installation comprising a platform selected from the group consisting of a vessel, a pontoon, and a jack-up, and further comprising a drill string drivingly connected with said platform, wherein at its lower end the drill string is provided with a drill bit, and wherein a seabed template suspendable from the platform is placeable on a seabed, and wherein a clamp mounted in the seabed template is provided for fixing the drill string relative to the seabed template, wherein the clamp is embodied as a chuck which is arranged for clamping the drill string whilst enabling the drill string's rotation, and wherein the chuck comprises a housing that is supported by the seabed template, and wherein in said housing a wedge-shaped clamp is provided for clamping the drill string, which wedge-shaped clamp has a rotation enabling coupling with said housing, wherein the wedge-shaped clamp is fixed to an inner tube which is connected through bearings with the housing so as to arrange that the inner tube and wedge-shaped clamp can jointly rotate within the housing vet are unmovable with reference to the housing in a vertical direction.