DISPOSITIF DE COLONNE MONTANTE POUR PRODUCTION EN MER

L'invention concerne un dispositif riser pour exploitation en eau profonde et susceptible d'être libéré ou rattaché aisément au support de surface. Le riser 34 est constitué d'une partie supérieure 37 supportée par le support de surface 42 et d'une partie inférieure 39 raccordée au manifold 31. Un dispositif connecteur 72 d'un flotteur immergé 36 permet le détachement de la partie 37, le flotteur 36 assurant avec les flotteurs équipant la partie 39 le maintien de la partie inférieure. L'invention s'applique à toute exploitation en eau profonde, de l'ordre de 2 000 mètres par exemple. A marine riser system for offshore well installations having a plurality of satellite subsea wells wherein production flow is conducted to a composite manifold structure on the sea floor, is raised to a floating platform for processing and processed production fluid is then returned to the manifold for transfer to storage or other facility. A riser pipe system which extends between the manifold structure at the sea floor and a floating platform wherein unprocessed production fluid is transported under high pressure in the riser system by a plurality of satellite or perimeter riser pipes which are arranged in a circle about a central riser pipe and which are separately and independently supported and maintained. Processed production fluid is conducted under low pressure through the central riser pipe at the center of the arrangement of satellite pipes, the central riser pipe providing a main structural member for the riser system. A marine riser pipe system having an upper riser pipe portion including central and satellite riser sections supported and carried by the floating platform and a lower riser pipe portion and buoyant structure associated therewith which include corresponding riser sections and which is capable of independently supporting itself in water when separated from the upper riser portion. A guiding and connecting assembly provides quick connecting and disconnecting of the upper riser portion to the buoyant structure, the lower riser portion with the buoyant structure being capable of standing vertically by itself. The manifold includes a releasable manifold section for maintenance and repair. A control system is provided at the manifold structure for actuation and monitoring of equipment installed on the manifold structure and on satellite wells. The control system is remotely controlled from the platform or vessel.