Wells – Submerged well – Submerged – buoyant wellhead or riser
Patent
1985-09-20
1987-10-27
Novosad, Stephen J.
Wells
Submerged well
Submerged, buoyant wellhead or riser
114256, 114264, 166354, 166358, 175 8, 405205, 405210, 405224, B63B 3544, E02D 574, E21B 712, E21B 4301
Patent
active
047023210
ABSTRACT:
A drilling, production and oil storage caisson for use in deep water offshore well operations in which the caisson has such a deep draft that its bottom end is subject only to minimal excitation forces caused by wave, wind and current acting on the caisson, the caisson including a plurality of oil storage compartments, a plurality of water ballast compartments above said oil storage compartments, a through axial passageway through said compartments; a riser system including a plurality of riser pipes in concentric circular arrangement within the through passageway or center well, each of the riser pipes being supported and tensioned by a buoyant flotation unit connected thereto; a drill string extending axially through said passageway between said riser pipes; and mooring lines connected to the bottom portion of the caisson extending therefrom with relatively low scope of 1:1 or less and providing a small watch circle for anchors for said mooring lines, the mooring lines being tensioned so that the mooring lines are substantially straight. A counterbalance for the drilling string includes a weighted section located near the bottom of the caisson. A deep draft caisson constructed and arranged so that heave motions are minimal.
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