Method and system for acoustic noise logging

Details Method and system for acoustic noise logging Method and system for acoustic noise logging

1977-02-28

1978-09-19

Moskowitz, Nelson

Acoustics

Geophysical or subsurface exploration

Well logging

181102, 340 155TN, 340524, 340605, G01V 140

Patent

active

041147219

ABSTRACT:
A pair of acoustic detectors are moved through a well to detect sound at various levels within the well. Electrical signals indicative of the detected sound are applied from the acoustic detectors by way of a conductor cable to uphole recording equipment including an amplifier, spectrum analyzer, crosscorrelator, and recorder. The spectrum analyzer provides frequency spectrums of the amplified signals from the acoustic detectors. The crosscorrelator provides an indication of the time differential between the traveltimes of acoustic noise to the acoustic detectors for use in the location of flow leaks through or behind the well casing.

REFERENCES:
patent: 2396935 (1946-03-01), Walstrom
patent: 3262515 (1966-07-01), Drum
patent: 3281773 (1968-10-01), Newman
patent: 3371197 (1968-02-01), Munson
patent: 3509764 (1970-05-01), Baldwin et al.
patent: 3854323 (1974-12-01), Hearn et al.
patent: 3908454 (1975-09-01), Mullins et al.
patent: 3930556 (1976-01-01), Kusuda et al.
patent: 3962674 (1976-06-01), Howell
Rex et al., "Correlation, Signal Averaging, and Probability Analysis," 11/69, pp. 2-20, Hewlett-Packard Journal, vol. 21, #3.

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