A sub-sea pumping system and an associated method

Details A sub-sea pumping system and an associated method A sub-sea pumping system and an associated method

F - Mech Eng,Light,Heat,Weapons

04

D

F04D 29/06 (2006.01) E21B 43/01 (2006.01) E21B 43/12 (2006.01) F04C 13/00 (2006.01) F04C 29/04 (2006.01) F04D 29/58 (2006.01) F16N 17/00 (2006.01)

Patent

CA 2239509

A sub-sea pumping system (1) for pumping an effluent from a deep-sea wellhead (95) comprising a topside module (3), a sub-sea module (5), and an umbilical connection (7) between the topside and sub-sea modules (3, 5). The umbilical connection (7) comprises a three-phase electrical power line and an hydraulic fluid supply line to an electrical canned motor (21). The hydraulic fluid is a single medium fluid, is compatible with the effluent being pumped, and is circulated through the sub-sea module (5) for cooling and for lubricating the seal and bearing arrangements (39, 40, 51, 53) of the motor (21) and the pump (23). The hydraulic fluid is circulated through a submerged pressure compensator (28) which includes a metal bellows assembly (71). The compensator (28) is responsive to the pressure of the effluent being pumped and pressurizes the hydraulic fluid flowing through the motor (21) and the pump (23) for the cooling and the lubricating of their respective seal and bearing arrangements (39, 40, 51, 53) at a pressure above the pressure of the effluent being pumped.

Cette invention concerne un dispositif de pompage sous-marin (1) conçu pour pomper un effluent provenant d'une tête de puits de grand fond (95). Ce dispositif comporte un module associé à la superstructure du bateau (3), un module sous-marin (5) et un raccord ombilical (7) entre les modules précédents. Ledit raccord ombilical (7) comporte une ligne d'alimentation en courant triphasé et une conduite d'alimentation en fluide hydraulique destinée à un moteur électrique protégé (21). Le fluide hydraulique est un fluide à constituant unique, il est compatible avec l'effluent à pomper et on le fait circuler à travers le module sous-marin (5) de façon à refroidir et à lubrifier les agencements de joints et de paliers (39, 40, 51, 53) du moteur (21) et de la pompe (23). Le fluide hydraulique circule à travers un compensateur de pression immergé (28) qui comporte un ensemble métallique faisant office de compensateur de dilatation à soufflet (71). Le compensateur de pression (28) réagit à la pression de l'effluent que l'on pompe et il met en pression le fluide hydraulique circulant dans le moteur (21) et la pompe (23), dans le but de refroidir et lubrifier les agencements respectifs de joints et de paliers (39, 40, 51, 53), à une pression supérieure à la pression de l'effluent soumis au pompage en cours.

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