中文摘要：

提出了一种非接触式剩余油探测装置的参数设计方法。通过两种观测装置在均匀介质中时域电磁响应特性的对比,确定了最佳观测装置结构。分析了发射信号脉冲宽度和关断时间对响应信号的影响。研究了发射线圈电性与实际发射波形关断时间的关系,提出了发射线圈参数的选择原则。讨论了斜阶跃波激励下接收线圈的过渡过程,并给出了匹配电阻和接收线圈分布电容的估算方法。根据分析结果最终设计了装置参数并进行了室内实验。结果表明,不论从响应信号幅度还是延迟时间,均可对不同电导率的介质进行有效识别,为今后时间域电磁法剩余油探测的井下实验奠定了基础。

英文摘要：

A non-contact type equipment parameter design method is presented to detect residual oil.The time-domain responses of two different measurement devices in homogeneous infinite medium are discussed.And the optimum device form is determined.The influence of transmit pulse width and off-time on the response signal is analyzed and the relationship between transmit coil electric characteristic and transmit waveform off-time is studied.Through calculating the effect of coil parameters on off-time of actual transmission waveform,the selection principle of transmitter parameters is presented.The transient process of receiver loop under ramp wave excitation is discussed;the estimation methods of the parallel matched resistance that is employed to remove the vibrating phenomenon and the parasitic capacitance of the receiver coil are given.Based on the above analysis,the equipment parameters were decided and laboratory experiment was carried out.Experimental results indicate that the media with different resistivities can be effectively identified based on either response amplitude or delay time,which provides a good foundation for future residual oil detection in borehole.