单极子声波测井径向探测特性分析

2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA) Pub Date : 2016-10-01 DOI:10.1109/SPAWDA.2016.7830037

Yixue Geng, Hao Chen, Xiao He, Xiumei Zhang, Xiuming Wang

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引用次数: 1

摘要

钻井引起井筒附近岩石性质的变化。本文采用径向柱状层状模型，用二维轴对称有限差分法研究单极子测井响应。设置三个变量，分别为过渡区厚度、源频率和源接收机间距。我们还使用慢速-时间相关方法来评估不同条件下声速的变化。最后，基于射线理论，分析了不同条件下第一波到达时间的变化特征。结果表明，压缩波的径向探测特性受间隔的影响较大。通过将不同的信号与不同的间距相结合，可以获得井筒附近的纵波速度层析成像。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Analysis of radial detection characteristics of monopole sonic logging

Drilling causes variation of the rock properties in the vicinity of a wellbore. In this article, we use the radial cylindrical layered model to examine monopole logging response with a two-dimensional axisymmetric finite difference method. Three variables are set, that is, the transition zone thickness, the source frequency and source-receiver spacing, respectively. We also use the slowness-time correlation-method to evaluate sound speed variations under different conditions. At last, based on the ray theory, the variation characteristics of the arrival time of the first wave under different conditions are analyzed. We conclude that the radial detection characteristics of compression waves are greatly affected by spacing. By combining different signals with various spacings, it is possible to obtain the tomography of the compressional wave velocities near wellbore.

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2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)

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