基于Goupillaud模型的钻柱波数值模拟和信号分析方法

Numerical simulation and signal analysis of the drillstring wave based on Goupillaud model

基于传递矩阵可以用一系列反射系数来表示整个钻柱,而钻柱顶端接收的钻柱波信号含有与这些反射系数相关的信息。基于钻柱模拟实验数据,利用盲源反褶积进行反射系数计算,将截取的输入子波与反射系数褶积,得到了模拟输出信号。结果表明,模拟输出信号与实际采集的信号相关度较高。运用该方法对随钻地震参考信号进行了处理,达到了强化钻头源信号的目的。

Based on transfer matrix,the whole drillstring can be expressed by reflection coefficients.The drillstring wave signals measured at the drillstring top contains the information related to the reflection coefficients.Based on the drillstring simulated experimental data,the reflection coefficients was calculated by using blind deconvolution. We got simulated output signal by the convolution of intercepted input wavelet and reflection coefficient.The result shows that the correlation of the simulated signal and the actual signal is very high.The method was used to process seismic while-drilling reference signals,and the source signals were strengthened.