Patent ID: 7373986
Filing Date: 2008-05-20
Classification: E21B,F16B

Abstract:
1. A method for connecting an enlargement on an upper portion of a riser that lies below the riser upper end wherein the riser is intended to extend up toward a receptacle on a floating structure that floats at the sea surface, so the upper end of the riser can be connected to a conduit on the floating structure, comprising: establishing the two devices of a double click mechanism, one on said enlargement and the other on said receptacle; extending a cable from a winch on the floating structure, through a hole in said receptacle, to the upper end of said riser, and connecting the cable to the upper end of the riser; pulling up the cable to lift the riser upper portion with the enlargement thereon until the enlargement enters the receptacle and moves upward therein while a first of said double click mechanism devices turns, and then allowing the cable and enlargement to fall while said first device turns further, all while said cable twists, until said first device is prevented from turning and said enlargement is stopped from further falling while still in the receptacle, all without operating any hydraulic or other energized actuator; connecting the upper end of the riser to said conduit.