Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Reexamination Certificate
2008-07-02
2010-11-23
Keith, Jack (Department: 3663)
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
C367S138000, C181S104000
Reexamination Certificate
active
07839718
ABSTRACT:
In some aspects of the invention, 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.
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Nihei Kurt
Pantea Cristian
Schmitt Denis P.
Sinha Dipen N.
Skelt Christopher
Breier Krystine
Chevron U.S.A. Inc.
Keith Jack
Los Alamos National Security LLC
Pillsbury Winthrop Shaw & Pittman LLP
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