Method for determining the thickness of a casing in a wellbore b

Details Method for determining the thickness of a casing in a wellbore b Method for determining the thickness of a casing in a wellbore b

1994-05-13

1996-02-13

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 28, 181105, G01V 140

Patent

active

054916682

ABSTRACT:
The invention is a method of determining the thickness of a casing in a wellbore penetrating an earth formation using group delay determined casing resonance extracted from processed reflection signals from an acoustic pulse-echo imaging tool. A first Fourier transform coefficient series is calculated from the digitized reflection signal. Individual samples of the reflection signal are multiplied by their sample index values to obtain a modified digitized data string. A second Fourier transform coefficient series is calculated from the modified digitized data. The complex group delay function is calculated directly from the first and second Fourier coefficient series.

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UltraSonic Imager, Schlumberger Wireline & Testing brochure.

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