直井随钻测斜磁流变液式负脉冲发生器研究

Research on Magnetorheological Fluid Negative Pulse Generator Used for Inclinometry While Drilling in Vertical Wells

随钻测量是掌握井下实时钻进信息并在此基础上进行优化控制的最佳手段,目前在油气钻井中已大量应用。钻井液压力脉冲传输是随钻测量信号传输的主要方式,虽然应用广泛,但在传输速率、功耗和精度等方面仍存在较大提升空间。为此,研发了一种用于随钻测斜的磁流变液式负脉冲发生器。阐述了磁流变液式负脉冲发生器的结构与工作原理,设计了磁流变液式负脉冲发生器的结构模型;基于麦克斯韦方程组、安培环路定理和高斯磁通定理,确定了影响脉冲发生器制动性能的参数,主要有电流、磁流变液材料参数和磁导绕管壁厚等;在选定类型磁流变液材料的基础上,基于ANSYS Electronics软件研究了电流、磁导绕管壁厚等参数对感应电磁场强度及其分布特性的影响。研究所得的结构模型、理论分析方法、仿真分析结果等可为磁流变液式负脉冲发生器的开发提供支撑,促进随钻测量技术的发展。

Measurement while drilling(MWD)is the best means to grasp downhole real-time drilling information and then conduct optimization control,and has been widely used in oil and gas well drilling.The mud pressure pulse transmission is the main method for MWD signal transmission,although widely used,it still can be largely improved in transmission rate,power consumption and accuracy.Therefore,a magnetorheological fluid negative pulse generator used for inclinometry while drilling was developed.First,the structure and working principle of the magnetorheological fluid negative pulse generator were expounded,and a structural model of it was designed;second,based on Maxwell s equations,Ampere s loop theorem and Gaussian flux theorem,the parameters affecting the braking performance of the pulse generator were determined,mainly including current,magnetorheological fluid material parameters and wall thickness of magnetic permeance tube;finally,based on the selected type of magnetorheological fluid material,the ANSYS Electronics software was used to study the effects of parameters such as current and wall thickness of magnetic permeance tube on the intensity and distribution characteristics of induced electromagnetic field.The structural model,theoretical analysis method and simulation analysis results obtained from the research provide support for the development of magnetorheological fluid negative pulse generator and promote the development of MWD technology.