Calibration of double-emission and single-receiving resonant electromagnetic wave logging coil system
ZHAO Zhizhong1,2, XING Bowen1,2,3, ZHANG Chao3, LIU Guoqiang3,4, LI Yanhong3, AN Hui-lin3,4
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China;
2. Hebei Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability, Hebei University of Technology, Tianjin 300130, China;
3. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;
4. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：Increasing the source distance from the recei-ver is an effective way to increase the detection depth of the electromagnetic wave resistivity logging-while-drilling tool,but in this case the received signals are seriously attenuated.In this paper,the principle of resonance is introduced into the electromagnetic wave resistivity logging-while-drilling,and a double-emission and single-receiving re-sonance coil system is used to increase the voltage amplitude of the receiving coil.The scale loop si-mulation formation conductivity is often used in laboratories to conduct research on instrument response characteristics.The calibration method for the double-emission and single-receiving resonance coil system is completely different from that of conventional open coil systems.Based on Doll geometric factor theory,the calibration ring parameter selection of the double-emission and single-receiving resonance coil system is studied,and it is found that the parameter selection should be compromised between the relative degree of stability and the scale ring resistance resolution to reduce the measurement error.An experimental platform is built and open-circuit response characteristics and resonant response characteristics of the receiving coil in a uniform layer are compared.The results show that the resonant method only increases the amplitude of the receive response without changing the amplitude ratio,which verifies the correctness of the scale ring parameter selection and the correctness of the resonance method.
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