Riser system for sub sea wells and method of operation

Details Riser system for sub sea wells and method of operation Riser system for sub sea wells and method of operation

1997-12-03

2000-03-28

Taylor, Dennis L.

Hydraulic and earth engineering

Marine structure or fabrication thereof

166359, 166367, 405224, E02B 1138, E02D 2300, E21B 712

Patent

active

06042303&

ABSTRACT:
An offshore oil or gas well riser system which forms a connection between the well head and a surface vessel. The system has a first riser section which extends vertically and is essentially rigid and a second riser section which is made of a flexible material to accommodate movements of the surface vessel. The first riser section has buoyancy means attached to its upper end to support at least partly the weight of the first riser section, and the first and second riser sections have corresponding first and second bores which provide a continuous path between the surface vessel and the well head. The profile of the flexible second riser section is variable to provide a smooth continuous path through its corresponding second bore and such that the path does not extend below the upper end of the first riser section. An emergency disconnect is provided between the first riser section and the second riser section and a full bore valve is provided between the first riser section and the second riser section to permit the passage of tools and equipment down through the riser to provide well intervention or other well operations.

REFERENCES:
patent: 4182584 (1980-01-01), Panicker
patent: 4391332 (1983-07-01), Fayrem
patent: 5007482 (1991-04-01), Forsyth et al.

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