Method and system for sonic well logging

Details Method and system for sonic well logging Method and system for sonic well logging

G - Physics

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G01V 1/34 (2006.01) G01V 1/24 (2006.01) G01V 1/40 (2006.01)

Patent

CA 1166739

M2-004 20.1926 DII METHOD AND APPARATUS FOR ACOUSTIC LOGGING OF A BOREHOLE A method and apparatus are described for preferentially exciting for extracting late arrivals at low frequencies in an acoustic investigation of a borehole. The late arrival may be the Stoneley wave whose amplitude is derived by measuring the energy in a predetermined frequency band of a waveform produced with a low frequency transmitter-receiver system. The transmitter produces a highly damped acoustic pulse whose frequency spectrum is selected to preferentially excite a late arrival such as the Stoneley wave and/or tube wave with wavelengths which are significantly greater than the diameter of the borehole while preserving measurable earlier arrivals at higher frequencies. A receiver system is used which provides a generally flat frequency response including low frequencies to produce waveforms of both the earlier arrivals at high frequencies and late arrivals at low frequencies with sufficient extractable amplitudes throughout a wide range of borehole and formation conditions. A method for generating the display are described for the investigations of the late arrival.

308913

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