A method and apparatus for downhole fluid analysis for...

E - Fixed Constructions – 21 – B

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E21B 47/08 (2006.01)

Patent

CA 2559937

A formation fluid sample is exposed to a rigidly-supported semi-permeable membrane (309) such as silicone rubber to permit diffusion of gases and vapors from the formation fluid into a vacuum chamber (311), while at the same time, blocking the passage of any liquids. The membrane-transmitted gas is analyzed in the vacuum chamber by a residual gas analyze (317)r. An ion pump (319) or sorbent is associated with the evacuated chamber to maintain the vacuum. The ion pump or sorbent removes gases and vapors from the chamber that diffuse into the chamber from the reservoir sample that is on the opposite side of the semi-permeable membrane.

Selon l'invention, un échantillon de fluide de formation est exposé à une membrane semi-perméable supportée de manière rigide tel qu'un caoutchouc de silicone afin de permettre la diffusion de gaz et de vapeurs du fluide de formation vers une chambre à vide, tout en bloquant le passage de n'importe quel liquide dans le même temps. Le gaz transmis à travers la membrane est analysé dans la chambre à vide par un analyseur de gaz résiduels. Une pompe ionique ou un sorbant est associée/associé à la chambre sous vide afin de maintenir le vide. La pompe ionique ou le sorbant élimine les gaz et vapeurs de la chambre qui se diffusent dans la chambre à partir de l'échantillon du réservoir qui est sur le côté opposé de la membrane semi-perméable.

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