Permanently eccentered formation tester

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 49/10 (2006.01)

Patent

CA 2514735

A formation tester for determining the formation pressure of a subsurface formation traversed by a wellbore comprises of: - an elongate tester body; - a support plate (3) that is extendible outwardly from the surface of the formation tester body, said support plate carrying probe means (5) to establish a passageway between the inside of said formation tester body and said formation, and a sealing pad (6) connected to said probe means to isolate said passage way between the inside of said formation tester body and said formation; - anchoring means (7) to settle said tester body at a level within the wellbore. The elongate tester body comprises an eccentric portion (2) wherein said support plate is mounted such that a determined standoff is maintained between said elongate tester body and the wall of the wellbore when said tester body is settled at a level in the wellbore.

L'invention concerne un appareil d'essai des couches destiné à déterminer la pression de formation d'une formation souterraine traversée par un puits de forage, et comprenant un corps d'appareil d'essai allongé, une plaque de support (3) pouvant s'étendre vers l'extérieur à partir de la surface du corps d'appareil d'essai des couches, ladite plaque de support supportant une unité de sonde (5) permettant de former un passage entre l'intérieur du corps d'appareil d'essai des couches et la formation, une plaquette d'étanchéité (6) montée sur l'unité de sonde et permettant d'isoler ledit passage entre l'intérieur de l'appareil d'essai des couches et la formation, ainsi qu'une unité d'ancrage (7) destinée à installer le corps de l'appareil à un niveau donné dans le puits de forage. Le corps d'appareil d'essai allongé comprend une partie excentrique (2), la plaque de support étant montée de sorte qu'une distance de sécurité soit maintenue entre le corps d'appareil d'essai allongé et la paroi du puits de forage lorsque ledit corps d'appareil d'essai est installé à un niveau donné dans le puits de forage.

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