Wellhead assemblies and methods
AssigneeOnesubsea, LLC
InventorsChristopher Almeland Knudtzon, Arild Nor Buset, Martin Pedersen
Life of this patent
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Abstract
A wellhead assembly comprises a foundation having at least one well slot. The at least one well slot comprises a receptacle having an internal profile for holding a well pipe and a sleeve arranged in the receptacle. The sleeve is vertically movable and has a top end, which in a first position of the sleeve is located above the internal profile and in a second position of the sleeve is located below the internal profile. There is also provided a method of installing a wellhead assembly at a seabed.
Claims20
A wellhead assembly comprising:
- a foundation having at least one well slot, the at least one well slot comprising a receptacle having at least one cement port, a sleeve lock mechanism, and an internal profile for holding a well pipe;
- a sleeve arranged in the receptacle, wherein the sleeve is vertically movable and comprises a top end which in a first position of the sleeve is located above the internal profile and in a second position of the sleeve is located below the internal profile;
- a vertical lock configured to temporarily hold the sleeve fixed in the first position, wherein the vertical lock comprises a removable lock pin configured to rest against a surface of the receptacle;
- and
- two support faces arranged along a central axis of the receptacle, wherein the two support faces are configured for alignment of the sleeve within the receptacle in the second position, and the two support faces are disposed below each of the internal profile, the sleeve lock mechanism, and the at least one cement port.
A method of installing a wellhead assembly at a seabed, the method comprising:
- positioning a foundation at the seabed, wherein the foundation comprises at least one well slot having a receptacle including at least one cement port, a sleeve lock mechanism, and an internal profile for holding a well pipe, wherein a sleeve is positioned in the receptacle in a first position via a vertical lock configured to temporarily hold the sleeve in the first position, and the vertical lock comprises a removable lock pin configured to rest against a surface of the receptacle;
- bringing the sleeve into the seabed in a second position, wherein two support faces are arranged along a central axis of the receptacle and configured for alignment of the sleeve within the receptacle in the second position, wherein the two support faces are disposed below each of the internal profile, the sleeve lock mechanism, and the at least one cement port;
- lowering the well pipe through the sleeve and into the seabed;
- and
- cementing the well pipe in place inside the sleeve.
Dependencies are inferred from the claim text.