Dual piston single phase sampling mechanism and procedure

Details Dual piston single phase sampling mechanism and procedure Dual piston single phase sampling mechanism and procedure

E - Fixed Constructions

21

B

E21B 49/08 (2006.01) E21B 49/10 (2006.01)

Patent

CA 2460831

A method and apparatus for maintaining the single phase integrity of a deep well formation sample that is removed to the surface comprises a vacuum jacket (32) insulated single working cylinder (30) divided by two free pistons (54, 56) into three variable volume chambers (60, 62, 64). The intermediate chamber (62) is pre-charged with a fixed quantity of high pressure gas. Wellbore fluid freely admitted to one end chamber (64) bears against one free piston (56) to further compress the gas. The formation sample is pumped into the other end chamber (54) to first, displace the wellbore fluid from the first end chamber (64) and, sequentially, to further compress the gas to preserve the sample phase state upon removal to the surface.

Procédé et appareil permettant de conserver l'intégrité monophasique d'un échantillon prélevé dans une formation à puits profond et ramené à la surface. L'appareil comprend un cylindre unique isolé dans un carter sous vide et divisé par deux pistons libres en trois chambres à volume variable. La chambre intermédiaire est préchargée avec une quantité fixe de gaz haute pression. Le fluide de forage admis librement dans une chambre terminale se dirige contre un piston libre de façon à comprimer ensuite le gaz. L'échantillon de la formation est aspiré par pompage dans l'autre chambre terminale de façon à déplacer d'abord le fluide de forage de la première chambre et à comprimer ensuite le gaz de façon à conserver l'état de phase de l'échantillon lors de sa remontée à la surface.

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