改进仪器不对中误差的轨迹系统误差模型研究

Research of Trajectory Systematic Error Model with Modified Misalignment Error

旨在提高井眼轨迹精度。扼要地介绍了现代井眼轨迹测量中常用的轨迹误差模型——WdW模型,给出其计算思路。以WdW模型和Dubrule等人的研究成果为基础,针对不对中误差提出改进建议,认为不对中误差导致的空间位置误差矢量均匀分布在井眼横截面上,并给出不对中误差源导致井眼不确定性范围的方法。根据测斜数据,结合近几年兴起的随钻测量误差模型,分析改进不对中误差后的WdW模型效果。结果证明改进的WdW模型比经典的WdW模型优越,不对中误差的处理方法正确。

A classical systematic error model WdW error model for describing well position uncertainties is presented. On the basis of analysis Dubrule ＇ s method, some suggestions are given direct at misalignment error. In consideration of the random orientation and magnitude of misalignment error, misalignment error uniformly distribu- ted on the cross section of trajectory is argued. The contribution of misalignment error to the covariance matrix is formulated. Finally comparison of WdW error model, modified error model and MWD error model in the same well can be used to evaluate the modified systematic error model. Results show that the modified systematic error model is a better way than classical WdW error model to calculate trajectory uncertainties.