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US 4,658,903 AGranted
Method for handling wellhead assembly
AssigneeMitsui Ocean Development & Engineering Co., Ltd.
InventorHiromitsu Tateishi
Life of this patent
Estimating the term…
Abstract
A method for handling an underwater wellhead assembly by means of an offshore jack-up drilling rig or platform wherein the wellhead assembly is prepared on the shore or quay and is carried on the drilling rig to a preselected drilling location and lowered down therefrom to the ocean floor.
Claims1
A method of handling an underwater assembly by an offshore jack-up drilling rig having a plurality of legs and a cantilever working deck slidably mounted on a platform thereof comprising steps of:
- (a) lowering down said legs to the ocean floor at a position adjacent to a template provided on shore, lifting up said jack-up drilling rig above the surface of a body of water, extending said cantilever working deck from said rig to over said template provided on the shore;
- (b) mounting said template on the underside of said cantilever working deck and returning said working deck together with said template back to the original position within said jack-up drilling rig;
- (c) lifting up said legs from the surface of a body of water and towing said rig to a preselected drilling position;
- (d) lowering down said legs from said rig to on the ocean floor and lifting up said platform above the surface of a body of water;
- (e) extending said cantilever working deck together with said template from said platform to over the surface of a body of water;
- and
- (f) lowering down said template to on the ocean floor.
4 more elements
Dependencies are inferred from the claim text.