Statoil Asa

Svein Inge Eide

Kare G Breivik

Gosta Nilsson

Paul Pallesen

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

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Sandnes, Norway

Svein Inge Eide