Formation testing apparatus with axially and spirally...

E - Fixed Constructions – 21 – B

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E21B 49/10 (2006.01)

Patent

CA 2419506

An apparatus and method for determining permeability of a subterranean formation is provided. The apparatus and method comprise a work string (106), at least one selectively extendable member (220) mounted on the work string (106) to isolate a portion of the annular space between the work string (106) and borehole (104). A predetermined distance (D) proportional to the radius of a control port (224) separates at least two ports in the work string. A sensor (226) operatively associated with each port is mounted in the work string (106) for measuring at least one characteristic such as pressure of the fluid in the isolated section.

L'invention concerne un appareil et un procédé pour déterminer la perméabilité d'une formation souterraine. Cet appareil comprend un train de tiges (106), avec au moins un élément (220) pouvant être étendu de manière sélective et monté sur le train de tiges (106) pour isoler une partie de l'espace annulaire situé entre le train de tiges (106) et le trou de sondage (104). Une distance prédéterminée (D) proportionnelle au rayon d'un orifice de commande (224) sépare au moins deux orifices dans le train de tiges. Un capteur (226) associé de manière opérationnelle à chaque orifice est monté dans le train de tiges (106) pour mesurer au moins une caractéristique telle que la pression du fluide dans la section isolée.

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