G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 1/44 (2006.01) E21B 47/14 (2006.01) E21B 49/00 (2006.01) G01V 1/50 (2006.01)
Patent
CA 2529173
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.
Froelich Benoit
Le Calvez Jean-Luc
Van Kuijk Robert
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
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