Subsea wellhead with segmented fatigue reduction sleeve
AssigneeAker Subsea AS
InventorDaniel A. WILLOUGHBY
Life of this patent
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Abstract
A subsea wellhead comprises a generally cylindrical body including a lower extension for forming an annular space for a cement column between the lower extension and an outer conductor. The extension carries a multiplicity of interfitting rings forming a sleeve which facilitates the flexure of the extension in the presence of the cement column. Each ring may comprise an inner flange for disposition adjacent the outside of the extension and an outer flange for fitment over the inner flange of an adjacent ring. The outer flange may have a radial through-bore.
Claims7
A subsea wellhead comprising a generally cylindrical body including an extension for forming an annular space for a cement column between the extension and an outer conductor, said extension carrying a multiplicity of interfitting rings forming a resilient sleeve which facilitates the flexure of the extension in the presence of the cement column.
A subsea wellhead comprising a generally cylindrical body including an extension for forming an annular space for a cement column between the extension and an outer conductor, wherein:
- said extension carries a multiplicity of interfitting rings of polymeric material and forming a resilient sleeve which facilitates the flexure of the extension in the presence of the cement column;
- each ring comprises an inner flange for disposition adjacent the outside of said extension and an outer flange for fitment over the inner flange of an adjacent ring;
- the thickness of said resilient sleeve is between 15 and 35 mm;
- and
- there is a weld joining the extension to said body and said resilient sleeve extends over the weld.
Dependencies are inferred from the claim text.