Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Reexamination Certificate
2006-12-12
2006-12-12
Hellner, Mark (Department: 3663)
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
C181S105000
Reexamination Certificate
active
07149146
ABSTRACT:
The invention provides a method for estimating an impedance of a material behind a casing wall, wherein the casing is disposed in a borehole drilled in a geological formation, and wherein a borehole fluid is filling said casing, the material being disposed in an annulus between said casing and said geological formation, said method using a logging tool positionable inside the casing and said method comprising: exciting a first acoustic wave in said casing by insonifying said casing with a first pulse, the first acoustic wave having a first mode that may be one of flexural mode or extensional mode; receiving one or more echoes from said first acoustic wave, and producing a first signal; extracting from said first signal a first equation with two acoustic properties unknowns for respectively said material and said borehole fluid; exciting a second acoustic wave in said casing by insonifying said casing with a second pulse, the second acoustic wave having a thickness mode; receiving one or more echoes from said second acoustic wave, and producing a second signal; extracting from said second signal a second equation with said two acoustic properties unknowns; extracting the acoustic properties of said material behind the casing wall from said first and said second equations.
REFERENCES:
patent: 2538114 (1951-01-01), Mason
patent: 3401773 (1968-09-01), Synnott, III
patent: 4255798 (1981-03-01), Havira
patent: 4703427 (1987-10-01), Catala et al.
patent: 6018496 (2000-01-01), Stanke et al.
patent: 6483777 (2002-11-01), Zeroug
patent: 6850462 (2005-02-01), McDaniel et al.
Calvez Jean-Luc Le
Froelich Benoit
Kuijk Robert Van
Echols Brigitte L.
Hellner Mark
Schlumberger Technology Corporation
Segura Victor H.
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