Device and method for generating a beam of acoustic energy...

G - Physics – 01 – V

Patent

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G01V 1/52 (2006.01)

Patent

CA 2729059

A device, positioned within a well bore, configured to generate and direct an acoustic beam into a rock formation around a borehole is disclosed. The device comprises a source configured to generate a first signal at a first frequency and a second signal at a second frequency; a transducer configured to receive the generated first and the second signals and produce acoustic waves at the first frequency and the second frequency; and a non-linear material, coupled to the transducer, configured to generate a collimated beam with a frequency equal to the difference between the first frequency and the second frequency by a non-linear mixing process, wherein the non-linear material includes one or more of a mixture of liquids, a solid, a granular material, embedded microspheres, or an emulsion.

L'invention porte sur un dispositif placé dans un trou de forage et conçu pour former et diriger un faisceau d'énergie acoustique dans une formation rocheuse entourant le trou de forage. Le dispositif comporte une source conçue pour produire un premier signal à une première fréquence et un deuxième signal à une deuxième fréquence; un transducteur conçu pour recevoir les deux signaux et produire des ondes acoustiques à la première et à la deuxième fréquence; et un matériau non linéaire couplé au transducteur et conçu pour produire un faisceau collimaté à une fréquence égale à la différence entre la première et la deuxième fréquence, par un procédé de mélange non linéaire, ledit matériau non linéaire comprenant un ou des mélanges de liquides, un solide, un matériau granulaire, des microsphères enrobées ou une émulsion.

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