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Numerical simulation of an acoustic field generated by a phased arc array in a fluid-filled borehole

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分类：P631.814[天文地球—地质矿产勘探;天文地球—地质学] TU473.14[建筑科学—结构工程;建筑科学—土工工程]
作者机构：[1]State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China
相关基金：This work is supported by the National Natural Science Foundation of China （Grant Nos. 10534040, 40574049 and 40874097）, the Research Fund for the Doctoral Program of Higher Education （Grant No. 20070425028） and the Foundation of State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum （Grant No. PRPDX2008-08）.
相关项目：随钻声波测井传感器研究

关键词：数值模拟, 钻孔, 液体, 声场, 阵列声波测井, 三维有限差分法, 声波波形, 反射成像, Phased arc array, acoustic field, acoustic well logging, azimuth, finite difference method

中文摘要：

声学的工具广泛地在很好记载的地上凿穿使用了并且在声学的思考成像没有的地上凿穿被开发方位角的测量的功能由于对称的来源，他们不能因此被用来评估地上凿穿的方位角的特性形成。在这篇论文， 3D 有限差别方法被用来在传统的单极来源和一个分阶段执行的弧数组产生的充满液体的地上凿穿模仿声学的领域。声学的波形为两个盒子被介绍。模仿的波形的分析显示出那与单极来源，不同分阶段执行的弧数组传输器产生的声学的精力主要在一个狭窄的方位角的范围放射了到地上凿穿，它是关键技术实现方位角的声学的井记载。类似于单极来源，分阶段执行的弧数组在充满液体的地上凿穿产生的波形也包含有压缩性的(P) 波浪并且砍(S) 波浪沿着地上凿穿测定了，它是分阶段执行的弧数组的理论基础声学的好记载。

英文摘要：

The acoustic tools widely used in borehole well logging and being developed in borehole acoustic reflection imaging do not have the function of azimuthal measurement due to a symmetric source, so they can not be used to evaluate the azimuthal character of borehole formation. In this paper, a 3D finite difference method was used to simulate the acoustic fields in a fluid-filled borehole generated by a traditional monopole source and a phased arc array. Acoustic waveforms were presented for both cases. The analysis of the simulated waveforms showed that different from the monopole source, the acoustic energy generated by the phased arc array transmitter mainly radiated to the borehole in a narrow azimuthal range, which was the key technique to implement azimuthal acoustic well logging. Similar to the monopole source, the waveforms generated by the phased arc array in the fluid-filled borehole also contain compressional （P） waves and shear （S） waves refracted along the borehole, which is the theoretical foundation of phased arc array acoustic well logging.

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