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    DEVICE AND METHOD FOR GENERATING A COLLIMATED BEAM OF ACOUSTIC ENERGY IN A BOREHOLE
    1.
    发明公开
    DEVICE AND METHOD FOR GENERATING A COLLIMATED BEAM OF ACOUSTIC ENERGY IN A BOREHOLE 审中-公开
    装置和方法，用于产生准直光束OFF声能一个洞

    公开(公告)号：EP2577354A2

    公开(公告)日：2013-04-10

    申请号：EP11720266.3

    申请日：2011-05-06

    申请人： Chevron U.S.A. Incorporated ,  Los Alamos National Security LLC

    发明人： VU, Cung Khac ,  SINHA, Dipen, N. ,  PANTEA, Cristian ,  NIHEI, Kurt, T. ,  SCHMITT, Denis, P. ,  SKELT, Christopher

    IPC分类号： G01V1/04 ,  G01V1/40 ,  G01V1/46

    CPC分类号： G01V1/46

    摘要： 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.

    METHOD AND SYSTEM FOR GENERATING A BEAM OF ACOUSTIC ENERGY FROM A BOREHOLE, AND APPLICATIONS THEREOF
    4.
    发明授权
    METHOD AND SYSTEM FOR GENERATING A BEAM OF ACOUSTIC ENERGY FROM A BOREHOLE, AND APPLICATIONS THEREOF 有权
    方法和系统用于产生声音能量束从孔和其用途

    公开(公告)号：EP2304474B1

    公开(公告)日：2012-06-20

    申请号：EP09763704.5

    申请日：2009-06-12

    申请人： Chevron U.S.A. Inc. ,  Los Alamos National Security LLC

    发明人： JOHNSON, Paul, A. ,  GUYER, Robert ,  LE BAS, Pierre-Yves ,  VU, Cung ,  NIHEI, Kurt ,  SCHMITT, Denis, P. ,  SKELT, Christopher ,  TEN CATE, James A.

    IPC分类号： G01V1/46

    CPC分类号： G01V1/46

    摘要： A compact array of transducers (110, 120) is employed as a downhole instrument for acoustic investigation of the surrounding rock formation. The array is operable to generate simultaneously a first acoustic beam signal (110) at a first frequency and a second acoustic beam signal (120) at a second frequency different than the first frequency. These two signals can be oriented through an azimuthal rotation of the array and an inclination rotation using control of the relative phases of the signals from the transmitter elements or electro-mechanical linkage. Due to the non-linearity of the formation (140), the first and the second acoustic beam signal (110, 120) mix into the rock formation where they combine into a collimated third signal (150) that propagates in the formation along the same direction than the first and second signals and has a frequency equal to the difference of the first and the second acoustic signals. The third signal is received either within the same borehole, after reflection, or another borehole, after transmission, and analyzed to determine information about rock formation.

    METHOD AND SYSTEM FOR GENERATING A BEAM OF ACOUSTIC ENERGY FROM A BOREHOLE, AND APPLICATIONS THEREOF
    8.
    发明公开
    METHOD AND SYSTEM FOR GENERATING A BEAM OF ACOUSTIC ENERGY FROM A BOREHOLE, AND APPLICATIONS THEREOF 有权
    方法和系统用于产生声音能量束从孔和其用途

    公开(公告)号：EP2304474A2

    公开(公告)日：2011-04-06

    申请号：EP09763704.5

    申请日：2009-06-12

    申请人： Chevron U.S.A., Inc. ,  Los Alamos National Security LLC

    发明人： JOHNSON, Paul, A. ,  GUYER, Robert ,  LE BAS, Pierre-Yves ,  VU, Cung ,  NIHEI, Kurt ,  SCHMITT, Denis, P. ,  SKELT, Christopher ,  TEN CATE, James A.

    IPC分类号： G01V1/46

    CPC分类号： G01V1/46

    摘要： A compact array of transducers (110, 120) is employed as a downhole instrument for acoustic investigation of the surrounding rock formation. The array is operable to generate simultaneously a first acoustic beam signal (110) at a first frequency and a second acoustic beam signal (120) at a second frequency different than the first frequency. These two signals can be oriented through an azimuthal rotation of the array and an inclination rotation using control of the relative phases of the signals from the transmitter elements or electro-mechanical linkage. Due to the non-linearity of the formation (140), the first and the second acoustic beam signal (110, 120) mix into the rock formation where they combine into a collimated third signal (150) that propagates in the formation along the same direction than the first and second signals and has a frequency equal to the difference of the first and the second acoustic signals. The third signal is received either within the same borehole, after reflection, or another borehole, after transmission, and analyzed to determine information about rock formation.