邵春,付信信,张杰
SHAO Chun,FU Xinxin,ZHANG Jie

• 1:中国地质大学(武汉)资源学院
• 2:中煤科工集团西安研究院有限公司

摘要(Abstract)：

钻柱是电磁波随钻测量(EM–MWD)信号传输的重要信道,评价EM–MWD信号传输效果,不可忽视钻柱的影响。基于此,采用ANSYS有限元软件,对EM–MWD信号传输特性进行仿真。从地面接收电压和电流密度两方面,分析了孔眼环空横截面积、钻柱横截面积、钻柱电阻率和绝缘短节位置对电磁波随钻测量信号传输的影响规律。仿真结果表明:地面接收信号随钻柱横截面积增大而增强,受孔眼环空间隙影响小;钻柱电阻率越低,接收信号越强;绝缘短节与钻头之间的距离越长,接收信号越强。
Drill–string is the important channel of EM–MWD(Electromagnetic measurement while drilling) signal transmission. The influence of drill–string can not be ignored when evaluating the transmission effect of EM–MWD signal transmission. Therefore, the finite element method is employed to simulate the characteristics of EM–MWD signal transmission. To analyze the influence laws of factor on EM–MWD signal transmission, which includes the cross–sectional area of annulus, the cross–sectional area of drill–string, the resistivity of drill–string and insulation nipple position through ground current density and ground receiver voltage. The simulation results show that signal intensity will be increased with the increase of drill–string cross–sectional area and the distance between drill bit and insulation nipple, but has nothing to do with annulus cross–sectional area. Signal intensity will be increased with the drill–string resistivity.

关键词(KeyWords)： 电磁波随钻测量;信号传输;钻柱;仿真
electromagnetic measurement while drilling;signal transmission;drill–string;simulation

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 邵春,付信信,张杰
SHAO Chun,FU Xinxin,ZHANG Jie

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