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Device and method for generating a beam of acoustic energy from a borehole, and applications thereof

Patent ·
OSTI ID:1107570
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In some aspects of the invention, a method of generating a beam of acoustic energy in a borehole is disclosed. The method includes generating a first acoustic wave at a first frequency; generating a second acoustic wave at a second frequency different than the first frequency, wherein the first acoustic wave and second acoustic wave are generated by at least one transducer carried by a tool located within the borehole; transmitting the first and the second acoustic waves into an acoustically non-linear medium, wherein the composition of the non-linear medium produces a collimated beam by a non-linear mixing of the first and second acoustic waves, wherein the collimated beam has a frequency based upon a difference between the first frequency and the second frequency; and transmitting the collimated beam through a diverging acoustic lens to compensate for a refractive effect caused by the curvature of the borehole.
Research Organization:
LANL (Los Alamos National Laboratory (LANL), Los Alamos, NM (United States))
Sponsoring Organization:
USDOE
DOE Contract Number:
AC52-06NA25396
Assignee:
Chevron U.S.A. Inc. (San Ramon, CA); Los Alamos National Security LLC (Los Alamos, NM)
Patent Number(s):
8,547,790
Application Number:
12/793,414
OSTI ID:
1107570
Country of Publication:
United States
Language:
English

References (8)

Dynamic nonlinear elasticity in geomaterials journal July 2001
Nonlinear generation of elastic waves in crystalline rock journal January 1987
Nonlinear generation of elastic waves in granite and sandstone: Continuous wave and travel time observations journal January 1989
Ultrasonic Study of Three-Phonon Interactions. II. Experimental Results journal November 1964
Nonlinear tube waves in permeable formations: Difference frequency generation journal July 2004
Interaction of Elastic Waves in an Isotropic Solid journal January 1963
Parametric Acoustic Array journal April 1963
Office journal November 2012

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