Importance

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Abstract

Procedure for retrieving an insertion of an underwater buoy (12, 50) in a well (11) at the bottom of a dynamically positioned vessel (10), at which a pulling line (16, 34) for interconnection with the buoy (12, 50) is lowered through the well (11) and hoisted to the deck (13) of the vessel (10), and the buoy (12, 50) is interconnected with the pulling line (16, 34) and hoisted into the well (11) by use of a winching device (15, 65) on the vessel, comprising the steps of attaching the pulling line (16, 34) to the connection unit (19, 32) on the deck (13) of the vessel (10), to lower the connection unit (19, 32) with the pulling line (16, 34) towards the buoy (12, 50) by use of a hoisting device (18, 30, 39) on the vessel (10) under possible guidance by use of the dynamic positioning system of the vessel, to place the connection unit (19, 32) on a cooperating device (20, 51, 52) on the top of the buoy (12, 50), whereby a terminal end on the pulling line (16, 34) is connected to the cooperating device (20, 51, 52) to release the connection unit (19, 32) from the cooperating device (20, 51, 62), and to hoist the connection unit onto the deck of the vessel (10) by using a hoisting device (18, 30, 39), to position the vessel (10) in such a way that the buoy (12, 50) is positioned vertically below the well (11) and to hoist the buoy (12, 50) into the well (11) by using a winching device (15, 65).

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First Claim