| 何晓,陈浩,王秀明.充液圆槽中单极声波仪器响应数值模拟与分析[J].,2014,33(2):95-101 |
| 充液圆槽中单极声波仪器响应数值模拟与分析 |
| Numerical simulations and analyses of monopole sonic logging responses in a liquid-loaded trough |
| 投稿时间：2013-09-29 修订日期：2014-02-28 |
| 中文摘要: |
| 为了实现声波测井仪器工作状态的快速检测，工程人员通常将仪器水平放置在载液圆槽中进行发射和接收测试，然而对于这种非轴对称结构中的声波导传播规律尚缺乏数值模拟和理论分析，因此迄今仍难以形成有效的测试规范和标准。本文利用三维有限差分算法模拟了载液圆槽中的单极测井仪器声波响应，对比了不同的圆槽物理、几何参数以及液体性质条件下单极子声场首波的幅度和相慢度大小。分析结果表明，单极仪器激发的首波慢度仅由圆槽的物理特征所决定，与圆槽几何参数、声源频率及液体特性无关；而首波幅度大小则与圆槽几何尺寸、圆槽和液体弹性波速等诸因素具有明确的对应关系。本研究结果可为用于仪器测试或速度刻度的圆槽模型井优化设计提供理论依据。 |
| 英文摘要: |
| To implement a convenient test of running performance of a sonic logging tool, petroleum engineers prefer to place the tool in a horizontal liquid-loaded trough for the examination of acoustic transducers. The wave propagation in such an axisymmetric structure, however, has not been simulated and analyzed yet. Hence it is lack of an effective standard for the sonic tool testing in this means until now. In the present work, the synthetic waveforms excited by a monopole logging tool in a liquid-filled trough are investigated through the 3D finite difference algorithm. The first-arriving waves related to troughs and liquids with different physical and geometrical features are analyzed by comparisons. Numerical simulation results reveal that the slowness of the first-arriving wave is only determined by the physical parameters of the trough and it is independent of the trough size, source frequency, or the liquid features. In contrast, the amplitude of that signal has definite correlations with several aspects, including geometric characteristics of the trough and the elastic wave speeds of the model materials. The analyses conclusions can provide theoretical bases on design of the trough-shaped model wellbore for the use of fast test or velocity calibration of a sonic logging tool. |
| DOI：10.11684/j.issn.1000-310X.2014.02.001 |
| 中文关键词: 声波测井,单极,首波,有限差分,数值模拟 |
| 英文关键词: Sonic logging, Monopole, First-arriving wave, Finite difference, Numerical simulation |
| 基金项目:自然科学基金项目(11134011, 41204099, 11374322) |
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