考虑磁方位校正的井眼轨迹测量误差计算

Calculation for Wellbore Trajectory Measurement Error Incorporating Magnetic Azimuth Correction

于瑞丰 刁斌斌 高德利

YU Ruifeng DIAO Binbin GAO Deli

石油工程教育部重点实验室（中国石油大学（北京）），北京 102249

MOE Key Laboratory of Petroleum Engineering (China University of Petroleum (Beijing)), Beijing, 102249, China

随着水平井、丛式井等技术的推广应用，对井眼方位角的测量精度要求越来越高。磁干扰条件下，多测点分析方法（MSA）是校正磁方位并提高井眼轨迹测量精度的一种有效方法。与现有井眼轨迹测量误差计算模型仅考虑轴向磁干扰校正相比，MSA同时考虑了轴向磁干扰和传感器误差源校正。因此，有必要建立适用于MSA的井眼轨迹测量误差计算模型。基于传感器误差模型及协方差传播率，推导了以直接测量参数为自变量的误差源权函数，建立了考虑磁方位校正的井眼轨迹测量误差计算模型，揭示了地磁参考场精度对校正后井眼轨迹误差的影响规律。研究结果表明，考虑磁方位校正的井眼轨迹测量误差随地磁参考场的精度降低而增大；采用高精度地磁模型进行磁方位校正，对于提高磁方位角测量精度、减小井眼轨迹测量误差具有现实意义。

With the popularization and application of horizontal wells, cluster wells, and other technologies, higher precision of wellbore azimuth angle measurement is required. Under the condition of magnetic interference, multi-station analysis (MSA) is an effective method for correcting the magnetic azimuth and improving the precision of wellbore trajectory measurement. Compared with the existing error calculation model of wellbore trajectory measurement that only considers the axial magnetic interference correction, MSA considers both the axial magnetic interference and error source correction of the sensor. Therefore, it is necessary to establish an error calculation model of wellbore trajectory measurement suitable for MSA. Based on the error model and covariance propagation rate of the sensor, the weight function of the error source with the directly measured parameters as the independent variables was derived, and an error calculation model of wellbore trajectory measurement incorporating magnetic azimuth correction was established. The influence law of the precision of geomagnetic reference fields on wellbore trajectory errors after magnetic azimuth correction was revealed. The results show that the wellbore trajectory measurement error after magnetic azimuth correction increases with the decrease in the precision of geomagnetic reference fields. It is of practical significance for improving the precision of magnetic azimuth measurement and reducing wellbore trajectory measurement errors by adopting a high-precision geomagnetic model for magnetic azimuth correction.

国家自然科学基金面上项目“邻井套管柱对近钻头磁信标磁场分布的影响与主动磁测距井眼防碰机制研究”（编号：51974336）和国家自然科学基金创新研究群体项目“复杂油气井钻井与完井基础研究”（编号：51821092）联合资助。

https://doi.org/10.11911/syztjs.2023056