水平井井眼轨迹控制误差分析

Abstract

随着诸多新型定向井、水平井(如分支井、丛式井、大位移井、绕障井、SAGD水平井、火驱井等井型)的应用，所钻遇的地质环境日趋复杂，在井眼密集的老区和超薄边际油层钻井中，对水平井井眼轨迹监测与控制的精度要求越来越高。由于随钻测量仪器在测量过程中由于受到环境、仪器精度、磁场变化等因素影响，实钻井眼轨迹就会与设计轨道产生偏差。认识测量仪器误差对轨迹控制的重要性，减小井眼轨迹控制的误差，提高井眼轨迹的控制精度，可以有效降低井眼防碰的风险，也可以提高水平井的中靶精度，对水平井的现场施工具有重要的指导意义。 With many new directional wells and horizontal wells (such as Multilateral wells, Cluster wells, ERW, SAGD, Fire Flooding wells) application, the geological environment is becoming more com-plex. The accuracy requirement of monitoring and controlling the trajectory of horizontal well in drilling is higher and higher, especially in the old wells and ultra dense marginal reservoirs wells. Due to the environment, the precision of the instrument, the change of the magnetic field, and so on, the influence of the factors on the measuring instrument in the measuring process is measured. So there is deviation between the real drilling trajectory and design trajectory. By recognizing the importance of measuring instrument error on trajectory control, this error can be reduced in slim hole trajectory control, and it also can improve the control precision of the well trajectory. It can reduce the risk of well drilling and improve the accuracy of the target. It has great realistic significance to field operation.