G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 1/40 (2006.01) E21B 47/02 (2006.01) E21B 47/14 (2006.01) G01V 1/44 (2006.01) G01V 1/02 (2006.01)
Patent
CA 2477468
The present invention provides a method and apparatus for using an acoustic logging tool conveyed in a borehole in an earth formation for determining a characteristic of the formation. The method comprises using a first acoustic source for generating an acoustic signal in the earth formation at a first frequency. A second acoustic source spaced apart from the first source is used for generating an acoustic signal in the earth formation at a second frequency different from the first frequency. An acoustic receiver is used for receiving a third acoustic signal indicative of said characteristic. The third acoustic signal has a frequency substantially equal to a difference between the first frequency and the second frequency, The third acoustic signal is produced by a nonlinear interaction between the first signal and the second signal in a portion of said earth formation.
Dubinsky Vladimir
Leggett James V. III
Bakers Hughes Incorporated
Sim & Mcburney
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