A measurement-while-drilling acoustic system employing...

G - Physics – 01 – V

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G01V 1/44 (2006.01) E21B 44/00 (2006.01) E21B 47/14 (2006.01) G01V 1/52 (2006.01)

Patent

CA 2209947

This invention is directed toward apparatus and methods for obtaining acoustic measurements or "logs" of earth formations penetrated by a borehole. More particularly, the invention is directed toward obtaining the acoustic measurements while the borehole is being drilled. The downhole apparatus comprises a plurality of segmented transmitters and receivers which allow the transmitted acoustic energy to be directionally focused at an angle ranging from essentially 0 degree to essentially 180 degrees with respect to the axis of the borehole. Downhole computational means and methods are used to process the full acoustic wave forms recorded by a plurality of receivers. A two way communication system is also used in the preferred embodiment of the invention.

La présente invention a trait à un appareil et une méthode permettant d'obtenir des mesures ou « diagraphies acoustiques » des formations traversées par le trou de forage. L'invention porte plus particulièrement sur l'obtention de diagraphies acoustiques pendant le forage du trou. L'appareil de fond comprend un certain nombre d'émetteurs segmentés et de récepteurs qui permettent de concentrer l'énergie acoustique émise de façon directionnelle selon un angle compris essentiellement entre 0 et 180 degrés par rapport à l'axe du trou de forage. Des moyens et des méthodes de calcul des mesures de fond sont employés pour traiter les formes d'ondes acoustiques pleines enregistrées par un certain nombre de récepteurs. Un système de communication bilatérale sert aussi dans cette application de la présente invention.

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