Drilling system for deep water offshore locations

Details Drilling system for deep water offshore locations Drilling system for deep water offshore locations

1975-10-03

1977-01-25

Blix, Trygve M.

Ships

Floating or semi-submersible storage vessel

B63B 3544

Patent

active

040045315

ABSTRACT:
A system for drilling and for producing subsea wells in relatively deep waters normally subjected to severe wave and current conditions. A floating drilling vessel or production unit is maintained in position over the well site. A riser pipe, maintained under constant tension, depends from the drilling or production vessel downwardly to and operably engages a well head. An elongated caisson depends from the drilling or production vessel to form a protective area about the riser pipe upper end. As a result, stresses induced in the riser pipe upper end by wave and current forces acting on the riser are thereby greatly reduced.

REFERENCES:
patent: 2777669 (1957-01-01), Willis et al.
patent: 3299846 (1967-01-01), Jarlan
patent: 3470838 (1969-10-01), Daniell
patent: 3824943 (1974-07-01), Mo

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