Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1995-10-10
1998-03-03
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
181103, 367 25, 3408557, G01V 140
Patent
active
057243085
ABSTRACT:
A downhole acoustic logging tool having a random access memory for storing acoustic waveforms in digital format. The waveforms being transmitted from a surface logging system to the random access memory in the downhole logging tool. The logging tool playing back the stored waveforms by converting the stored digital format into an analog signal that is amplified sufficiently for driving an acoustic transmitter. A received pilot signal is used to determine the signal attenuation of the logging cable and a correction is made therefrom to the actual received acoustic signal. Complex waveform types may be programmed into the random access memory for specific formation characteristics. Tapered turn-on and turn-off of the signal waveform amplitudes reduce higher frequency spectral noise that may interfere when correlating the received acoustic signal with the transmitted acoustic signal.
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Zemanek, J.; Williams, D. M. and Schmitt, M. P.; "Shear-Wave Logging Using Multipole Sources," The Log Analyst, pp. 233-241, May-Jun. 1991.
Canterbury Donald L.
Smith Thomas S.
Sorrells Martin H.
Fagin Richard A.
Lobo Ian J.
Western Atlas International Inc.
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