摘要
The influence of an acoustic logging tool on borehole guided wave propagation should be considered in the processing and inversion of the guided waves for formation acoustic property estimation. This study introduces an equivalent-tool theory that models the tool response using an elastic rod with an effective modulus and applies the theory to multipole acoustic logging for both wireline and logging while drilling （LWD） conditions. The theory can be derived by matching the tool’s acoustic impedance/conductance to that of the multipole acoustic wavefield around the tool, assuming that tool radius is small compared to wavelength. We have validated the effectiveness and accuracy of the theory using numerical modeling and its practicality using field data. In field data applications, one can calibrate the tool parameters by fitting the theoretical dispersion curve to field data without having to consider the actual tool’s structure and composition. We use a dispersion correction example to demonstrate an application of the simple theory to field data processing and the validity of the processing result.
指导波浪繁殖应该在为形成处理和指导波浪的倒置被认为声学的性质评价的地上凿穿上的一个声学的记载工具的影响。这研究介绍与有效模量用有弹性的杆为工具反应建模并且把理论用于多极的一个相等工具的理论为有线线路的声学的记载并且当钻时，记载(LWD ) 条件。理论能被匹配工具导出声学的阻抗 / 传导力到多极的在工具附近的声学的 wavefield，假定那工具半径与波长相比是小的。我们用用领域数据的数字建模和它的实物验证了理论的有效性和精确性。在领域数据应用程序，一个人能由适合理论分散曲线没有不得不考虑实际工具结构和作文，回答数据校准工具参数。我们使用一个分散修正例子演示简单理论的一个应用程序回答数据处理和处理结果的有效性。
基金
supported by the Fundamental Research Funds for the Central Universities and the National Hi-tech Research and Development Program of China (863 Program) (Grant No. 2007AA06Z232 )
