Use of acoustic emission in rock formation analysis

Details Use of acoustic emission in rock formation analysis Use of acoustic emission in rock formation analysis

G - Physics

01

V

G01V 1/44 (2006.01) G01V 1/40 (2006.01)

Patent

CA 2238883

The invention relates to a method of determining a characteristic of a material selected from rock formation and cement, which material surrounds a borehole containing a fluid. The method comprises positioning an acoustic sensor at a selected position in the borehole, the acoustic sensor being suitable to provide signals representing acoustic emission from said material, applying a selected pressure to the fluid thereby inducing mechanical stresses in said material, said stresses inducing acoustic emission from said material. The sensor is induced to detect the acoustic emission and to provide a signal representing the acoustic emission. The characteristic is determined from said signal and from the pressure applied to the fluid.

L'invention concerne un procédé de détermination d'une caractéristique d'un matériau choisi à partir d'une formation rocheuse et de ciment, lequel matériau entoure un trou de forage contenant un fluide. Ce procédé consiste à placer un capteur acoustique au niveau d'une position choisie dans le trou de forage, lequel capteur est conçu pour fournir des signaux représentant l'émission acoustique provenant dudit matériau, puis à appliquer une pression choisie au fluide, ce qui a pour effet de provoquer des contraintes mécaniques dans ledit matériau, lesquelles induisent une émission acoustique à partir de celui-ci. Le capteur est conçu pour détecter l'émission acoustique et pour produire un signal représentant celle-ci. On détermine ensuite la caractéristique à partir de ce signal et à partir de la pression appliquée au fluide.

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