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

Claim 0:
1. A method for establishing a well foundation and drilling of a borehole using a vessel, the method comprising:
preinstalling a subsea node on a seabed;
lowering a set of a bottom hole assembly, a kelly busing adapter and a non-rotating drill string from the vessel down into the sea using hoisting means on the vessel;
setting the bottom hole assembly into the subsea node;
coupling the bottom hole assembly to the subsea node using the kelly bushing adapter having a locking mechanism locking the kelly busing adapter to the subsea node or a housing, ensuring vertical movement and preventing rotation of the bottom hole assembly, the kelly bushing adapter being configured to transfer reactive torque produced from a 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;
setting weight in the bottom hole assembly;
pumping a fluid from a pump on the vessel or on the seabed through a hose into the bottom hole assembly and down the non-rotating string in order to drive a drilling motor of the bottom hole assembly; and,
drilling the borehole by means of the drilling motor.