Acoustic well logging with energy level detection

Details Acoustic well logging with energy level detection Acoustic well logging with energy level detection

G - Physics

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G01V 1/40 (2006.01) G01V 1/28 (2006.01) G01V 1/48 (2006.01)

Patent

CA 1162633

ABSTRACT OF THE DISCLOSURE A well-logging method and apparatus for detecting the first arrival of an acoustic wave in a logging signal under adverse signal conditions. The received acoustic signal is amplified at a fixed gain until clipped at the largest amplitude throughout the logging procedure. This amplified signal is converted RMS to DC level signal and stored in sample and hold means for a period shortly before first arrival of the acoustic wave. The continuing DC level signal and the stored DC level signal are compared to pro- duce a comparator output DC signal when the continuing DC signal has a certain increased magnitude. This certain increased magnitude is used to generate a pulse of given magnitude and duration that is especially suitable in di- gital data systems.

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