Buoys – rafts – and aquatic devices – Buoy – Having means to control attitude or position
Patent
1985-04-15
1988-09-06
Barefoot, Galen
Buoys, rafts, and aquatic devices
Buoy
Having means to control attitude or position
441 1, 441 3, 405195, 166350, B63B 2218
Patent
active
047689846
ABSTRACT:
The present invention provides a service buoy for performing direct wireline maintenance of a subsea well. The buoy is maintained in position over the well by a rigid riser kept under tension and which allows for the well re-entry. The primary buoyant body of the buoy is maintained permanently submerged and a truss structure presenting the minimum surface area to the action of wind and waves extends above the sea level to support a small deck from which the wireline work can be performed. The centers of gravity and buoyancy for the buoy are in close proximity so as to minimize lateral surge and sway motions of the installed buoy.
REFERENCES:
patent: 3568228 (1969-01-01), Rudelick
patent: 4188156 (1980-02-01), Fisher et al.
patent: 4256417 (1981-03-01), Bohannon
patent: 4280238 (1981-07-01), van Heijst
patent: 4284143 (1981-08-01), Scherrer et al.
de Oliveira Joao G.
Erb Paul R.
Morton Arthur W.
Triantafyllou Michael S.
Barefoot Galen
Conoco Inc.
Salmon Paul E.
Thomson Richard K.
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