Method for determining the thickness of a casing in a...

Details Method for determining the thickness of a casing in a... Method for determining the thickness of a casing in a...

G - Physics

01

V

G01V 1/48 (2006.01) G01B 17/02 (2006.01) G01B 17/04 (2006.01) G01V 1/44 (2006.01)

Patent

CA 2148953

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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