摘要
评价电磁波随钻测量(EM-MWD)信号传输效果,不可忽视套管对信号传输的影响,而套管对信号传输影响极为复杂,很难用数学模型进行全面分析。基于此,采用ANSYS有限元软件,对EM-MWD在套管中信号传输进行建模仿真,从地面电流密度及接收信号压差方面,分析套管对EM-MWD信号传输影响规律。仿真结果表明:绝缘短节出套管,套管对信号起引导作用,反之,套管对信号起屏蔽作用;低电阻率钻井液对EM-MWD在套管中的信号传输影响大。
The influence of casing can not be ignored for evaluating the transmission effect of EM - MWD signal, and it is difficult to analyze this effect with mathematical models because of the casing＇s extremely complicated effects. Therefore, modeling and stimulation of EM - MWD signal transmission in the casing were made by ANSYS finite element software to analyze the influence rule of casing on EM - MWD signal transmission in the aspects of ground current density and ground receiver voltage. The stimulation results show that the casing plays a guiding role to the signal when insulation nipple is out of the casing, and conversely, the casing has a shielding effect on the signal ; low resistivity drilling fluid has a great influ- ence on EM - MWD signal transmission in the casing.
出处
《探矿工程（岩土钻掘工程）》
2015年第12期6-8,共3页
Exploration Engineering:Rock & Soil Drilling and Tunneling
关键词
电磁波随钻测量
信号传输
套管
钻井液
仿真
electromagnetic measurement while drilling （ EM - MWD）
signal transmission
casing
drilling fluid
simulation
