Measurement of formation characteristics using acoustic borehole

Details Measurement of formation characteristics using acoustic borehole Measurement of formation characteristics using acoustic borehole

1994-08-31

1996-05-28

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 49, 364422, 324335, G01V 140

Patent

active

055218822

ABSTRACT:
Apparatus and methods for determining an indication of a nonlinear property of a formation traversed by a borehole are provided. An acoustic tool is used in a borehole to generate first and second signals of different frequencies. As a result of nonlinearities in the formation, the mixing of the first and second signals results in a third signal having a frequency equal to the difference of the frequencies of the first and second signals. The amplitude of the third signal is measured by a detector, and the indication of nonlinearity of the formation is determined according to a relationship which relates the measured amplitude at the measured frequency to the amplitudes of the first and second signals, the frequency of measurement, the velocity of the measured wave, the distance of the receiver from the source, and a function of the nonlinear and linear parameters of the formation. The indication of nonlinearity may then be utilized to give an indication of the relative consolidation of the formation surrounding the borehole.

REFERENCES:
patent: 4012950 (1977-03-01), Kompfner et al.
patent: 4819214 (1989-04-01), Gutowski et al.
patent: 5081611 (1992-01-01), Hornby
Johnson et al., Jour. of Geophys. Research, vol. 92, No. B5, pp. 3597-3602, Apr. 10, 1987.
Johnson et al. J. Geophys. Res, B., vol. 94, pp. 17-729/17-733.
Johnson et al, J. Acoust. Soc. America, vol. 89, #2, Feb. 1991, pp. 598-603.

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