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随钻电磁波传播测井仪应用于油气田开发,需要确定装置参数。分析了发射信号频率对测量结果的影响,确定本装置采用双频体制。第一频率选取2 MHz,第二频率选取400 kHz,由接收信号的幅度比和相位差求取地层的介电常数和电阻率信息。讨论了线圈系结构对接收信号的影响,确定两接收线圈间距为0.1～0.25 m,发射线圈到接收线圈的源距为0.5～1.0 m。不同激励信号功率对测量结果的响应分析表明,在设计允许的条件下,应尽可能提高激励信号的功率。
While drilling electromagnetic wave propagation logging tool used in oil and gas field development, it is necessary to determine the device parameters. The influence of the transmitted signal frequency on the measurement results is analyzed, and the dual-frequency system of the device is determined. The first frequency is 2 MHz and the second frequency is 400 kHz. The dielectric constant and resistivity of the formation are obtained from the amplitude and phase difference of the received signal. The influence of the coil structure on the received signal is discussed. The distance between the two receiving coils is 0.1-0.25 m and the source to receiving coil is 0.5-1.0 m. The response analysis of the different excitation signal power to the measurement results shows that the power of the excitation signal should be increased as much as possible under the design allowable conditions.