Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1989-05-08
1992-05-26
Steinberger, Brian S.
Acoustics
Geophysical or subsurface exploration
Well logging
367143, 367166, 367912, G01V 140
Patent
active
051158809
ABSTRACT:
A piezoelectric seismic vibrator is disclosed which utilizes a hydraulic system to amplify the longitudinal displacement which results from the application of a voltage to a stack of piezoelectric elements. In each disclosed embodiment of the present invention, a stack of piezoelectric elements is mounted so as to bear upon a power piston which in turn acts upon a high bulk modulus substantially incompressible body of fluid, such as mercury. A drive piston is provided having a cross-sectional area which is smaller than the area of the power piston and the pressure within the fluid system acts to amplify the longitudinal displacement of the piezoelectric elements. The movement of the drive piston is then coupled mechanically or fluidically to the earth to generate seismic waves therein. In one depicted embodiment of the present invention each stack of piezoelectric elements is disposed within a fluid filled chamber which is pressurized by means of communication with the borehole fluids.
REFERENCES:
patent: 4869349 (1989-09-01), Minear et al.
patent: 4996674 (1991-02-01), Thompson
Corrigan Michael A.
Sallas John J.
Halliburton Geophysical Services
Steinberger Brian S.
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