Determining the in situ effective mobility and the effective...

Details Determining the in situ effective mobility and the effective... Determining the in situ effective mobility and the effective...

E - Fixed Constructions

21

B

E21B 49/08 (2006.01)

Patent

CA 2434810

Determining the in situ effective mobility of a formation layer comprises selecting a location in the formation layer; lowering in the borehole traversing the formation layer a tool that comprises a central conduit having an inlet and being provided with a pressure sensor, a fluid receptacle having an inlet opening into the central conduit, a fluid analyser, and means for discharging fluid; making an exclusive fluid communication between the formation and the inlet of the central conduit; allowing formation fluid to pass through the central conduit, analysing the fluid, allowing the formation fluid to enter into the fluid receptacle when the fluid is the substantially uncontaminated formation fluid, and measuring the pressure build-up; and determining the effective mobility from the pressure build-up.

L'invention concerne la détermination in situ de la mobilité effective d'une couche de formation, qui consiste à sélectionner un emplacement dans la couche de formation, à abaisser dans le trou de forage traversant la couche de formation un outil constitué d'un conduit central doté d'une entrée et comprenant un détecteur de pression, un récipient de fluide doté d'une entrée dans le conduit central, un analyseur de fluide et un dispositif de décharge de fluide, à établir une communication fluidique exclusive entre la formation et l'entrée du conduit central, à permettre au fluide de formation de traverser le conduit central, à analyser le fluide, à permettre au fluide de formation d'entrer dans le récipient de fluide lorsque le fluide est un fluide de formation sensiblement non contaminé, et à mesurer la montée en pression, puis à déterminer la mobilité effective à partir de la montée en pression.

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