Method and device for moving subsea rocks and sediments

B - Operations – Transporting – 63 – C

Patent

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Details

B63C 11/52 (2006.01) E02B 3/02 (2006.01) E02F 3/92 (2006.01) E02F 5/28 (2006.01)

Patent

CA 2389331

Method for moving subsea rocks and sediments, also at significant depths, e.g. in connection with removal of protective rocks around subsea installations where maintenance is to be conducted, by which equipment comprising a tubing with an ejector nozzle is arranged completely externally in relation to the tubing on a standard, remote controlled submarine (ROV). The ejector nozzle is connected to a preferably hydraulic powered water pump; the water pump is run by means of the energy supply to the ROV, so that the ejector nozzle produces a pressure gradient through said tubing. The inlet end of said tubing is contacted with rocks and sediments to be moved with the result that said rocks and sediments are sucked into the tubing at its inlet end and blown out of its outlet end. The invention also relates to a device to conduct the method, which device is arranged on an ROV and comprises a tubing (5) through which the sediments (14) are transported, an ejector nozzle (11) arranged externally in relation to the tubing (5), and a water pump (12,13) connected to the ejector nozzle. All energy is supplied through the cable(s) (3) to the surface which constitutes the ROV's ordinary energy supply.

L'invention concerne un procédé permettant de déplacer des pierres et des sédiments sous-marins, à de grandes profondeurs également, ce procédé concernant principalement le déplacement de pierres de protection autour d'installations sous-marines devant subir un entretien. Ce procédé consiste à utiliser un équipement comprenant un tuyau muni d'un éjecteur monté intégralement sur la surface externe d'un robot sous-marin (ROV) classique. L'éjecteur est connecté de préférence à une pompe à eau à commande hydraulique, la pompe à eau étant actionnée par l'énergie utilisée par le sous-marin électrique, de façon que la tuyère d'éjecteur produise un gradient de pression à travers ledit tuyau. L'entrée dudit tuyau est mise en contact avec les pierres et les sédiments devant être déplacés, ces pierres et sédiments étant ainsi aspirés dans le tuyau par son entrée et évacués par sa sortie. L'invention concerne également un dispositif permettant de mettre en oeuvre ce procédé. Ce dispositif est conçu sur un robot sous-marin (ROV) et comprend un tuyau (5) à travers lequel les sédiments (14) sont transportés, un éjecteur (11) disposé extérieurement et relié au tuyau (5), et une pompe à eau (12, 13) connectée à l'éjecteur. Toute l'énergie est acheminée par le(s) câble(s) (3) à la surface constituant l'alimentation ordinaire du robot sous-marin (ROV).

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