旋轉磁场测距导向系统测距方法的研究.docVIP

双水平井测距导向系统的算法研究 巩宪锋 张伟波 （北京科技大学机械工程学院 北京 100083） 摘要：稠油/超稠油具有密度大，流动性性差等特点，目前国际上用来开采稠油比较前沿的是SAGD辅助重力泄油技术。这一技术的一大关键是利用磁导向工具钻一对相互平行，保持一定垂距的双水平井。本文基于磁导向系统ＲＭＲＳ，把旋转的磁短节当成旋转的磁偶极子，在现有的磁短节空间远场的磁场分布规律的基础上提出了现行算法中存在的一些问题。对磁通门三轴传感器上接收到的信号进行分析，提出了另外一种基于两个观测点的信号模型。基于多重相关法和拉格朗日插值法提出了一种新的求同频周期信号的相位差的方位，并基于相位差解算双水平井之间的相对方位。用最小二乘法对相位信号进行拟合，以期能够提高整个系统的精度。结合整个RMRS系统和这一算法可以给传统测井斜方法提供参数，得到双水平井之间的相对空间位置。地面司钻人员以此为参考，引导正钻井沿着已钻井的井身轨迹钻进。此方法可以在信号有效范围内的任意两点之间测量两井之间的相对方位，无累积误差，大大提高可操作性。通过算例论证和分析证明，这一方法的计算精度可以满足实际工程应用的要求。 关键词：SAGD技术，双水平井，磁偶极子，测距导向，多重相关，信号相位 An algorithm of the directing and measuring system for twin horizontal wells Gong Xianfeng Zhang Weibo (?University of Science and Technology Beijing, the institute of mechanical engineering, Beijing ,100083) Abstract: The heavy oil or super heavy oil has the characteristics of big density and poor liquidity. The steam assistance gravity drive is a international cutting-edge technology to drilling this kind of oil. A　 key　 to 　this　 technology is the using of magnetic steering tool to drilling a pair of parallel wells, maintaining a certain offset at the same time. This text base on the system of RMRS, which considering the revolving magnetic sub as a rotating magnetic dipole, which has its own magnetic field distribution and far field. There exist some problems after a analysis of the method existed. The writer analysis the signals in the three-axial fluxgate, thereafter reconstruct the signal model. Based on the multiple correlation and Lagrange interpolation, the writer presents a new method to get the phase difference between signals. The results can calculate the relative direction between the two horizontal wells. In order to enhance the precision of the whole system, the least square method has been used .Combined with the RMRS system and the algorithm can provide parameters to traditional logging system, thus we can get the relative location between the double horizontal well. Driller on ground take this as a reference, guiding the