LWD Sonic Tool Design For High-Quality Logs
LWD Sonic Tool Design For High-Quality Logs
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DOI：
10.1190/1.3513831
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Toshihiro Kinoshita;A. Dumont;H. Hori;N. Sakiyama;J. Morley;F. Garcia-Osuna
中科院分区：
文献类型：
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作者：
Toshihiro Kinoshita;A. Dumont;H. Hori;N. Sakiyama;J. Morley;F. Garcia-Osuna
随钻测井（LWD）声波工具的设计一直是一个挑战；沿着工具的声波传播不能被忽略，也不能由于工具的存在而对测量产生影响。众所周知，在快速地层中，钻铤到达会干扰纵波。在设计LWD声学工具时，还必须考虑接箍与其他模式（如Stoneley和四极杆）的相互作用。由于LWD工具占据了井眼横截面的很大面积，因此已知声波工具在井眼中的存在会改变慢频域的色散曲线。在本文中，我们提出了一种优化工具设计的方法，以最大限度地减少工具对测量的影响，或使工具存在的影响可预测，从而能够广泛使用所获取的数据。实验结果验证了该工具的设计，真实测井实例说明了所获得波形的质量。
The design of a logging-while-drilling (LWD) sonic tool is always a challenge; the acoustic propagation along the tool cannot be ignored, nor can effects on measurements due to tool presence. It is well known that collar arrivals can interfere with compressional waves in fast formations. The interaction of the collar with other modes such as Stoneley and quadrupole must also be considered while designing an LWD acoustic tool. Because the LWD tool occupies a significant area of the borehole cross section, it is known that the presence of a sonic tool in a borehole shifts a dispersion curve in the slowness frequency domain. In this paper, we present an approach to optimize tool design for minimizing tool effects on measurements or making tool presence effects predictable for enabling a broadband use of the acquired data. Experimental results validate the design of the tool, and real log examples illustrate the quality of the acquired waveforms.