摘要 |
<p>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 range and the second frequency, and wherein the non-linear medium has a velocity of sound between 100 m/s and 800 m/s.</p> |
申请人 |
CHEVRON U.S.A. INC.;LOS ALAMOS NATIONAL SECURITY LLC;VU, CUNG KHAC;SINHA, DIPEN N.;PANTEA, CRISTIAN;NIHEI, KURT T.;SCHMITT, DENIS P.;SKELT, CHRISTOPHER |
发明人 |
VU, CUNG KHAC;SINHA, DIPEN N.;PANTEA, CRISTIAN;NIHEI, KURT T.;SCHMITT, DENIS P.;SKELT, CHRISTOPHER |