Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1988-07-18
1989-10-10
Tarcza, Thomas H.
Acoustics
Geophysical or subsurface exploration
Well logging
181106, 367 25, G01V 140
Patent
active
048725269
ABSTRACT:
A sonic isolation joint (SIJ) of a sonic well logging tool is disposed between a sonic transmitter section and a sonic receiver section of the tool and attenuates compressional and flexural waves which propagate longitudinally along an axis of the tool when the sonic transmitter transmits a pressure wave into a formation of a borehole. The SIJ comprises a first outer housing, a second outer housing, an inner housing disposed within the first and second outer housings, a first attenuation member disposed between the first outer housing and the inner housing and a second attenuation member disposed between the second outer housing and the inner housing, each of the attenuation members including a plurality of rubber isolating washers, and a plurality of steel washers interleaved with the plurality of rubber isolating washers. The attenuation members are each fit between a flange of the outer housing and a flange of the inner housing and are compressed when the sonic dipole tool string is lowered into the borehole.
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Hoyle David C.
Wignall Albert H.
Bouchard John H.
Garrana Henry N.
Lobo Ian J.
Schlumberger Technology Corporation
Tarcza Thomas H.
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