Method and apparatus for acoustic detection of a fluid leak...

Details Method and apparatus for acoustic detection of a fluid leak... Method and apparatus for acoustic detection of a fluid leak...

2007-05-22

2007-05-22

Hellner, Mark (Department: 3663)

Acoustics

Geophysical or subsurface exploration

Well logging

C367S035000

Reexamination Certificate

active

10559090

ABSTRACT:
An acoustic detection of a discrete acoustic signal allows to detect a leak behind a casing (23) of a borehole. An acoustic amplitude (AA) is sampled during a recording time period (24; 64) at a determined position along the tube. Time intervals (26; 66) are defined inside of the recording time period (24), and for each time interval (26) the measured acoustic amplitudes are processed to obtain respectively a corresponding power-frequency spectrum (261). A plurality of the power-frequency spectra are analyzed to identify the discrete acoustic signal by detecting time and frequency dependant changes of power. Preferably the processing involves a Fourier transform analysis. A power-frequency time plot is used to conveniently identify the discrete acoustic event.

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HB Koerner, JC Carroll “Use of the noise log as downhole diagnostic tool”.
Society of Petroleum Engineers, vol. SPE No. 7774 Mar. 25, 1979-Mar. 29, 1979 pp. 191-198, XP002257831.

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