Patent ID: 11905831
Assignee: VETCO GRAY SCANDINAVIA AS
Field: Civil engineering (Other fields)
Classification: CPC E  B | IPC B  E

Claim 7:
8. A system for establishing a well foundation and drilling of a borehole using a vessel, the system comprising:
a subsea node comprising a low pressure housing and configured to be preinstalled on a seabed;
a bottom hole assembly comprising a drill bit, a drilling motor, a kelly bushing adapter, a non-rotating string, a side entry sub and a lifting sub and configured to be lifted from the vessel and lowered down into the sea by means of a hoisting means on the vessel, the kelly bushing adapter being configured to transfer reactive torque produced from the rotating drill bit to the subsea node and to allow the non-rotating string to travel freely up and down and to prevent the non-rotating string from rotating, where the bottom hole assembly is configured to be set into the subsea node with the low pressure housing;
a locking mechanism configured to lock and unlock the kelly bushing adapter to one from the group consisting of: the low pressure housing, a suction anchor and a high pressure housing; and,
a pump being configured to pump a fluid through a hose into the side entry sub and down the non-rotating string in order to drive the drilling motor in order to drill a desired depth of the borehole thus drilling at a first part of the borehole with the vessel.