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

Patent ·
OSTI ID:1107357
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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 broad-band acoustic pulse at a first broad-band frequency range having a first central frequency and a first bandwidth spread; generating a second broad-band acoustic pulse at a second broad-band frequency range different than the first frequency range having a second central frequency and a second bandwidth spread, wherein the first acoustic pulse and second acoustic pulse are generated by at least one transducer arranged on a tool located within the borehole; and transmitting the first and the second broad-band acoustic pulses into an acoustically non-linear medium, wherein the composition of the non-linear medium produces a collimated pulse by a non-linear mixing of the first and second acoustic pulses, wherein the collimated pulse has a frequency equal to the difference in frequencies between the first central frequency and the second central frequency and a bandwidth spread equal to the sum of the first bandwidth spread and the second bandwidth spread.
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):
8,547,791
Application Number:
12/793,420
OSTI ID:
1107357
Country of Publication:
United States
Language:
English

References (7)

Ultrasonic Study of Three-Phonon Interactions. II. Experimental Results journal November 1964
Nonlinear tube waves in permeable formations: Difference frequency generation journal July 2004
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
Interaction of Elastic Waves in an Isotropic Solid journal January 1963
Parametric Acoustic Array journal April 1963
Dynamic nonlinear elasticity in geomaterials journal July 2001

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