The Design of the Coil System in LWD Tools Based on Azimuthal Electromagnetic-Wave Resistivity Combined with Sections
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摘要: 针对现有随钻方位电磁波电阻率测井仪地层层界面检测灵敏度较弱且层界面探测深度较浅的问题，设计了分段组合线圈系，并采用理论分析和仿真试验的方法，对不同线圈系的测量响应进行数值模拟计算，分析了层界面位置和距离变化对分段组合线圈系测量响应的影响规律。数值模拟结果表明，分段组合线圈系的感应电动势信号幅值明显高于现有线圈系的感应电动势信号幅值，其层界面探测深度约为1.70 m，优于现有线圈系的层界面探测深度。研究表明，分段组合线圈系可提高测井仪器的地层层界面检测灵敏度和层界面的探测深度，这可为随钻方位电磁波电阻率测井仪器的研制提供理论支持。Abstract: Due to existing azimuthal electromagnetic-wave resistivity, logging-while-drilling tools have low sensitivity for detecting the stratum interface and shallow detection depths; thus the coil system with sectional combination was designed, and assessed using numerical simulation and calculation for the measurement responses of different coil systems by means of theoretical analysis and simulation experiments. At the same time, the effecting regularity of interface position and distance on measurement responses of the coil system was also compared and analyzed. The numerical simulation results showed that the induction signal amplitudes of the designed coil system was higher than that of the existing coil systems, with a detection depth of 1.70 m for the stratum interface. Research results indicated that the innovative coil system could improve the detection sensitivity of logging tools on the interface and depth of formations, and provide valuable guidance for the development of LWD tools based on azimuthal electromagnetic-wave resistivity.
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Keywords:
- sectional combination /
- coil system /
- structural design /
- detection depth
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