Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1990-04-20
1993-06-01
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 30, 367 47, 73579, 73630, 364422, 364582, G01V 140, G01N 2904
Patent
active
052166384
ABSTRACT:
Method for determining at least one characteristic of a casing cemented in a borehole, such as cement bond and casing thickness, from a reflected acoustic signal S(t) obtained by directing an acoustic pulse at a substantially normal incidence towards a radial sector of the wall of the casing, the pulse stimulating thickness resonance within the walls of the casing. The method according to the invention comprises the steps of: determining a first time window corresponding to a first portion of signal S(t) including the initial reflection from the casing and subsequent acoustic returns due to resonance, determining a second time window corresponding to a second portion of signal S(t) mainly including the initial reflection from the casing, and determining the casing characteristic from information related to resonance contained in the first time window while normalizing the information by information contained within the second time window.
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Foodman Marc D.
Moskowitz Nelson
Schlumberger Technology Corporation
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