Riser angle control apparatus and method

Details Riser angle control apparatus and method Riser angle control apparatus and method

1984-11-28

1986-03-18

Corbin, David H.

Hydraulic and earth engineering

Marine structure or fabrication thereof

166367, 175 7, 405202, E21B 712

Patent

active

045765162

ABSTRACT:
Method and apparatus for use in drilling a well from an offshore drilling vessel having a riser extending from the vessel down to a subsea wellhead. The apparatus of the invention comprises a flexible coupling installed in the riser's upper elements, with a tensioned cable connected between the flexible coupling and the vessel. The angle of misalignment of the riser's upper elements due to ocean currents impacting the riser and/or vessel may be maintained within acceptable limits by adjusting the tension applied to the flexible coupling.

REFERENCES:
patent: 3359741 (1967-12-01), Nelson
patent: 3522709 (1970-08-01), Vilain
patent: 3523578 (1970-08-01), Nolan et al.
patent: 4067202 (1978-01-01), Reed

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