Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1994-08-30
1995-08-01
Eldred, J. Woodrow
Acoustics
Geophysical or subsurface exploration
Well logging
367 25, 367 38, 367911, 175 40, 166250, 73152, G01V 120
Patent
active
054381690
ABSTRACT:
The invention is a method and apparatus for measuring the quality of acoustic coupling between a wellbore wall and a borehole seismic sensor system. The system includes the steps of positioning the system at a desired depth in the wellbore and activating a locking mechanism powered by a DC motor. The motor then has broadband AC applied to it to cause vibration of the system. The output of at least one seismic sensor in the system is processed in a spectrum analyzer, and the result is checked for the presence or absence of natural resonance of the system. In a particular embodiment, the system response to the broadband AC is used to generate an inverse filter operator to compensate the system response to a geophysical survey for partial acoustic coupling.
REFERENCES:
patent: 4715469 (1987-12-01), Yasuda et al.
patent: 4979585 (1990-12-01), Chesnutt
patent: 5189262 (1993-02-01), Engler et al.
Vertical Seismic Profiling, 2nd enl. ed., Hardage, Bob A., Geophysical Press Limited, London, 1985, pp. 36, 263, 268-269.
Atlas Wireline Services Brochure "AWS-1300 GM Downhole Receiver Tool", 1994.
Kennedy William S.
Wolfe Kenneth J.
Eldred J. Woodrow
Fagin Richard A.
Western Atlas International Inc.
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