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US 11,905,831 B2Granted
Rigless drilling and wellhead installation
AssigneeVetco Gray Scandinavia AS
InventorsJarle Hvidsten, Knut Inge Dahlberg, Anders Berggren, Vidar Strand
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Abstract
The present invention relates to methods and systems for establishing a well foundation as well as for drilling and installation of a surface casing without any use of a drilling rig.
Claims11
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.
5 more elements
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.
3 more elements
Dependencies are inferred from the claim text.