文章讨论了经典的ＷｄＷ井眼测量误差分析理论的八项缺陷和不足，认为该理论不再适合于现代井眼轨迹测量误差的分析工作。根据现代井眼轨迹测量特点，从两种角度总结和概括了井眼轨迹测量误差的种类，从误差与仪器的内在关系上，可分为仪器相关误差和非相关误差；从误差本身的统计性质上，可分为系统误差、随机误差和粗差。针对目前最常用的，基于固态磁力或速率陀螺传感器的测量工具，进一步地描述了其模块意义上的七个独立误差根源，即原始传感器输出值误差、测量深度、磁偏角误差、磁干扰误差、磁化纠正误差、钻具组合下垂误差以及不同轴误差。之后文中又探讨了衡量井眼位置不确定性的重要指标—协方差矩阵的构造方法，并在此基础上介绍了如何确定井眼每一测点的误差椭球或椭圆及相应的置信水平。最后探讨了这套方法在评价井眼轨迹交碰概率上的应用 This paper discusses eight defects and shortcomings of the classic WdW wellbore error analysis theory, and concludes that the theory is no longer suitable for the analysis of the error of well trajectory measurement. According to the characteristics of modern wellbore trajectory measurement, the types of wellbore trajectory measurement errors are summarized and summarized from two perspectives. From the intrinsic relationship between the error and the instrument, it can be divided into instrument-related errors and non-correlation errors. From the statistical nature of the errors themselves On, can be divided into system error, random error and gross error. According to the most commonly used measurement tools based on solid-state magnetic or rate gyro sensors, the seven independent sources of error in the module sense are further described, namely the original sensor output value error, measurement depth, magnetic declination error, magnetic interference error , Magnetization correction error, drill assembly sag error and misalignment error. After that, the paper also discusses the construction method of the covariance matrix, which is an important index to measure the wellbore position uncertainty, and on this basis, describes how to determine the error ellipsoid or ellipse and the corresponding confidence level for each wellbore measurement point. Finally, the application of this method in evaluating the probability of well trajectory collision is discussed