Improvements in and relating to laying of pipeline

Details Improvements in and relating to laying of pipeline Improvements in and relating to laying of pipeline

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 1/16 (2006.01) F16L 1/19 (2006.01)

Patent

CA 2394868

A method of abandoning a pipeline (2) being laid by a vessel (1) having an A/R (abandonment and recovery) system, wherein a sealine (2, 11, 13) is initially held by a pipe laying and tensioning arrangement. The method includes a step of reducing the tension at sea level of the sealine (2, 11, 13), by connecting one or more light buoyant elongate members (13) to the end of the pipeline (2). The elongate members (13) are then lowered into the sea, using a line (16) from a winch on the vessel (1). At least one elongate member (13) is connected to the pipeline (2) through a connection (12) which allows pivoting of the elongate member (13) so that the end of the elongate member (13) at the end of the pipeline (2) projects upwardly from the seabed (3). The connection of the winch line (16) to the sealine (2, 11, 13) may be cut off by remote actuation of a locking mechanism.

Cette invention a trait à un procédé d'abandon d'un pipeline (2) en cours de pose par un navire (1) équipé d'un système A/R (abandon et récupération). Dans le cadre de ce procédé, une conduite à la mer (2, 11, 13) est tenue initialement par un dispositif de pose et de mise en tension de conduite. Dans une étape de ce procédé, on diminue la tension de la conduite à la mer (2, 11, 13) au niveau de la mer en attachant à l'extrémité du pipeline (2) un ou plusieurs éléments de forme allongés flottant et légers (13). On immerge ensuite ces éléments (13) à l'aide d'un câble (16) monté sur un cabestan dans le navire (1). Au moins un élément allongé (13) est relié au pipeline (2) par un connecteur (12) autorisant le pivotement dudit élément (13) de sorte que l'extrémité de cet élément (13) au niveau de l'extrémité du pipeline fait saillie vers le haut depuis le fond marin (3). Il est possible de déconnecter le câble (16) de la conduite à la mer (2, 11, 13) par actionnement à distance d'un mécanisme de blocage.

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