Method for connecting underwater pipelines particularly...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/013 (2006.01) E21B 41/04 (2006.01) F16L 1/16 (2006.01) F16L 1/26 (2006.01)

Patent

CA 2216108

Method for connecting underwater pipelines characterised by the following steps: installation of a pipeline (7) on a seabed fixed frame (2); laying of an outboard pipeline (10) by a lay barge; installation of a subsea winch (28) within the frame; actuation of the winch by a ROV (26A) to unwind the cable (33) of the winch, aided by a second ROV (26B) bringing and connecting the end of the cable to the outboard pipeline; winding of the cable and following deflection of the outboard pipeline up to the frame; installation of a metrology system (38) to define the distance and angular misalignment between the two pipelines ends to be connected; assembly of a connection system (50) with telescopic capabilities using the measurements of the metrology system and using a dedicated frame installed on board the support ship; installation of the connection system on the seabed fixed frame and connection of the connection system with the pipelines ends.

Cette invention concerne un procédé de raccordement de pipe-lines sous-marins qui se caractérise par les étapes suivantes:- installation d'un pipe-line (7) sur un dormant du fond marin (2), - pose d'un pipe-line extérieur (10) par une barge de pose, - installation d'un treuil sous-marin (28) à l'intérieur du dormant, - actionnement du treuil par un engin télécommandé (26A) de façon à dérouler le câble (33) du treuil à l'aide d'un second engin télécommandé (26B) qui apporte et raccorde l'extrémité du câble au pipe-line extérieur, - enroulement du câble et suivi de la déflexion du pipe-line extérieur jusqu'au dormant, - installation d'un système métrologique (38) pour établir la distance et le désalignement angulaire entre les deux extrémités de pipe-lines à raccorder, - assemblage d'un système de raccordement (50) doté de capacités télescopiques à l'aide des mesures effectuées par le système métrologique et au moyen d'un bâti spécialisé installé à bord du navire, - installation du système de raccordement sur le dormant du fond marin et raccordement du système de raccordement aux extrémités de pipe-lines.

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