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Patent
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G01V 1/40 (2006.01) G01V 1/52 (2006.01)
Patent
CA 1330586
Method and Apparatus for Performing Acoustic Investigations in a Borehole Abstract An apparatus for performing acoustic investigations of subsurface geological formations penetrated by a borehole is disclosed to include a longitudinally extending body, a transmitter carried by said body for transmitting acoustic energy at a frequency chosen to fall within a natural transmission stop band exhibited by the body, and an acoustic energy receiver carried by the body and spaced from the transmitter for receiving acoustic energy at the chosen frequency. The body includes, intermediate the transmitter and receiver, a periodic array of sections that have different acoustic propagation characteristics which tend to cause acoustic wave interference in the body at the chosen frequency so as to attenuate the acoustic energy propagated along the body at the chosen frequency.
614375
Chang Shu-Kong
Kostek Sergio
Mcdaniel Gordon
Plona Thomas
Randall Curtis
Schlumberger Canada Limited
Smart & Biggar
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