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G01V 1/40 (2006.01) G01H 11/08 (2006.01) G01V 1/18 (2006.01) G01V 1/44 (2006.01)
Patent
CA 1219053
ACOUSTIC WELL LOGGING DEVICE FOR DETECTING COMPRESSIONAL AND SHEAR WAVES Abstract A borehole logging system employs a compressional wave transmitter 17 and a shear wave transmitter 18. The transmitters 17, 18 are alternately fired to impart compressional and shear waves into the formations surrounding the borehole. A bender-type receiver 10, spaced apart from the transmitters 17, 18 in the borehole is alternately gated so that voltages generated across a pair of piezoelectric planar surfaces therein are subtracted during the expected time period of symmetrical motion of the receiver 19 to provide a compressional wave output and added during the expected arrival time period of unsymmetrical motion of the receiver 19 to provide a shear wave output.
461405
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
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