公开(公告)号：US07689362B2

公开(公告)日：2010-03-30

申请号：US11574905

申请日：2005-09-08

申请人： Benoît Froelich ,  Emmanuel Legendre

发明人： Benoît Froelich ,  Emmanuel Legendre

IPC分类号： G01V1/48

CPC分类号： G01V1/48

摘要： A method for estimating an impedance of a material behind a casing wall in a borehole, the method comprises exciting the casing wall with an acoustic pulse, and measuring by means of a transducer an experimental acoustic waveform (W) reflected from the casing wall. The method further comprises initializing an impedance parameter (Zin), computing an inverse casing response (Rcas−1) as a function of the impedance parameter (Zin) and a casing thickness parameter (Casin), and deconvoluting the experimental acoustic waveform with the inverse casing response to obtain a transducer response (T). An iterative loop is performed, comprising the computing of an inverse casing response and the deconvoluting of the experimental acoustic waveform by varying the impedance parameter until the transducer response becomes compact in the time domain. The estimated impedance (Zcem) is obtained from the impedance parameter when the transducer response is compact.

摘要翻译： 一种用于估计钻孔中的壳体壁后面的材料的阻抗的方法，所述方法包括用声脉冲激发所述壳体壁，并且借助于换能器测量从所述壳体壁反射的实验声波形（W）。 该方法还包括初始化阻抗参数（Zin），计算作为阻抗参数（Zin）和壳体厚度参数（Casin）的函数的反向壳体响应（Rcas-1），并将实验声波形与逆 套管响应以获得换能器响应（T）。 执行迭代循环，包括通过改变阻抗参数来计算反壳体响应和实验声波形的去卷积，直到传感器响应在时域中变得紧凑。 当传感器响应紧凑时，从阻抗参数获得估计阻抗（Zcem）。