Continuous flow downhole gas separator for progressing...

E - Fixed Constructions – 21 – B

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E21B 43/38 (2006.01) B01D 19/00 (2006.01) F04C 13/00 (2006.01)

Patent

CA 2207770

The efficiency of progressing cavity pumps is drastically reduced if the liquid being pumped contains large volumes of gas. To alleviate this problem a gas separator is provided which can be attached to the suction of a downhole pump to remove gas from the liquid being pumped prior to the liquid entering the pump inlet. The separator comprises an elongate housing having an annular chamber with guides which direct the liquid gas mixture to flow in an annular path from the inlet to the outlet end. During this flow centrifugal forces act to displace the gas content to the central region from which it is removed via a separate central gas outlet so that liquid delivered to the pump inlet is greatly reduced in its gas content.

L'efficacité de pompes à cavité intermédiaire est fortement réduite si le liquide pompé contient de grands volumes de gaz. Pour atténuer ce problème, un séparateur de gaz est fixé du côté de succion de la pompe de fond de trou afin d'éliminer les gaz du liquide pompé avant que ce liquide ne pénètre dans la pompe par son orifice d'entrée. Le séparateur comprend un logement de forme allongée ayant une chambre annulaire et des guides qui dirigent le mélange de gaz et de liquide afin de l'amener à s'écouler dans un passage annulaire, de l'orifice d'entrée jusqu'à l'orifice de sortie. Au cours de l'écoulement du mélange, les gaz contenus dans le mélange sont poussés par la force centrifuge vers la zone centrale d'où ils sont évacués par un orifice central distinct de sortie des gaz; ainsi, la teneur en gaz du liquide qui passe par l'orifice d'entrée de la pompe est sensiblement réduite.

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