双水平井电磁测距径向距离计算方法研究

基于旋转磁场测距(RMRS)的基本理论与方法,在考虑磁源尺寸的条件下,首先推导出旋转磁源周围空间磁场分布规律,然后根据磁信号的轴向分量推导出双水井径向距离的计算方法,最后在此基础上通过仿真和实验提出了磁偶极子模型成立的前提条件。研究表明,探管与磁源的距离大于10倍磁源尺寸时,磁偶极子模型是适用于RMRS系统的;探管与磁源的距离小于10倍磁源尺寸时,径向距离的计算方法能够确定注汽井和生产井的水平段间距,对双水平井导向钻井磁测距计算方法作了进一步完善,为此导向仪器的研究提供了理论参考。

Double horizontal electromagnetic radial distance calculation method study

Based on the basic theory and method of rotating magnetic field ranging (RMRS), under the condition of considering magnetic source size, space magnetic field distribution around the rotating magnetic source was deduced, based on the axial component of magnetic signal export the calculation method of radial distance of double Wells and on the basis of it, magnetic dipole model established premise condition was determined by the simulation and experimental. Research shows that when the test tube and magnetic source distance is more than 10 times the size of magnetic source, magnetic dipole model is applicable to RMRS system; When the test tube and magnetic source distance less than 10 times the size of magnetic source, the rotating magnetic field near field model can determine the spacing of steam injection well and production well, the conclusion consummates the double horizontal well drilling magnetic distance calculation method for the further, providing a theoretical reference for the selection of magnetic nipple, guide instrument of research.