Acoustic well logging method and apparatus for detecting and mea

Details Acoustic well logging method and apparatus for detecting and mea Acoustic well logging method and apparatus for detecting and mea

1978-07-27

1980-07-01

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 27, 367 29, 367 30, 364422, 328146, G01V 140

Patent

active

042109655

ABSTRACT:
A method and apparatus are described for detecting an acoustic wave in a waveform produced from a sonic receiver in response to an acoustic investigation of a borehole. The maximum amplitude of the waveform is measured and a portion thereof utilized as a threshold for comparison with successively different combinations of initial portions of the waveform and the waveform location, where the threshold is exceeded, is identified as the location of the wave. A pattern comparison is made between waveform segments where the acoustic wave is initially located to provide a correction factor for a more accurate locating of the acoustic wave. A parameter of the wave, such as its interval travel time is measured with the acoustic wave locating techniques.

REFERENCES:
patent: 3237153 (1966-02-01), Blizard
patent: 3289157 (1966-11-01), Brokaw
patent: 3292729 (1966-12-01), Blizard
patent: 3829858 (1974-08-01), Bergkvist
patent: 3900824 (1975-08-01), Trouiller et al.
patent: 4040001 (1977-08-01), Vivet et al.
patent: 4077038 (1978-02-01), Heller et al.
Scott et al., "Acoustic Logging for Mining Applications", 6/5/74, pp. 1-10, SPWLA 15th Annual Logging Symp.

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