Subsea wellhead with a segmented fatigue reduction sleeve

摘要

A subsea wellhead includes a generally cylindrical body 1 including a lower extension 9 for forming an annular space 11 for a cement column between the lower extension 9 and an outer conductor 5. The extension 9 carries a multiplicity of interfitting rings 13a, 13b forming a sleeve 12 which facilitates the flexure of the extension in the presence of the cement column. Each ring 13a, 13b may comprise an inner flange 15 for disposition adjacent the outside of the extension 9 and an outer flange 14 for fitment over the inner flange of an adjacent ring. The outer flange 14 may have a radial through-bore 16.