Subsea casing hanger suspension system

Details Subsea casing hanger suspension system Subsea casing hanger suspension system

E - Fixed Constructions

21

B

166/67

E21B 33/128 (2006.01) E21B 33/043 (2006.01) E21B 33/00 (2006.01)

Patent

CA 1218298

ABSTRACT OF THE DISCLOSURE The present invention relates to an improved system for suspending well casing in a subsea well head. Each of a plurality of concentric casing strings and its hanger are directly and totally supported on the well head housing independently of all the other strings and their hangers by a plurality of expandable, load ring slips that are run into the housing in retracted position with and as a component of the previous casing's pack-off assembly. Due to each casing string being supported by the well head housing independently of the other strings, the total load exerted by the casing strings, their hangers and well test pressure that the suspension system can support is significantly greater than that supportable by other systems of comparable size. This increase is achieved even when lower strength materials are employed. The improved load carrying capability of the system facilitates deeper drilling programs to be accomplished offshore from floating drilling rigs.

462295

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