发明名称 |
DETERMINATION OF THE IMPEDANCE OF A MATERIAL BEHIND A CASING COMBINING TWO SETS OF ULTRASONIC MEASUREMENTS |
摘要 |
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.
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申请公布号 |
CA2529173(C) |
申请公布日期 |
2013.06.25 |
申请号 |
CA20052529173 |
申请日期 |
2005.12.06 |
申请人 |
SCHLUMBERGER CANADA LIMITED |
发明人 |
VAN KUIJK, ROBERT;LE CALVEZ, JEAN-LUC;FROELICH, BENOIT |
分类号 |
G01V1/44;E21B47/00;E21B47/14;E21B49/00;G01V1/50 |
主分类号 |
G01V1/44 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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