Fluid sampling methods and apparatus for use in boreholes

E - Fixed Constructions – 21 – B

Patent

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E21B 49/10 (2006.01)

Patent

CA 2485822

The invention concerns a method and apparatus for sampling formation fluids surrounding a borehole within a minimum of contamination by borehole fluids. A borehole tool is provided with a sampling probe to contact the borehole wall. The probe comprises an inner probe and an outer probe for withdrawing respective fluid samples for the formation. The ratio between the respective flow areas of the inner and outer probes is selected so as to tend to reduce the time taken to obtain via the inner probe a sample of the formation fluids having a given level of contamination by borehole fluids.

L'invention concerne un procédé et un appareil d'échantillonnage de fluides de formation entourant un trou de forage avec un minimum de contamination par fluides du trou de forage. L'invention concerne également une sonde de trou de forage adaptée pour entrer en contact avec la paroi du trou de forage. Cette sonde comprend une sonde intérieure et une sonde extérieure pour retirer des échantillons de fluides correspondants de cette formation. Le rapport entre les sections d'écoulement correspondants des sondes intérieure et extérieure est sélectionné de manière à réduire le délai requis pour obtenir, via la sonde intérieure, un échantillon des fluides de formation présentant un niveau donné de contamination par les fluides du trou de forage .

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