定向钻进轨迹控制误差矢量分析方法及工程应用

A Vector Analysis Method for Directional Drilling Trajectory Control and Its Application to Engineering

定向钻进中,实钻轨迹与设计控制目标之间往往存在误差,误差的定量分析对轨迹调整与精度控制至关重要。论文依据定向钻进矢量控制原理,分析研究了造斜工具实钻矢量与设计轨迹控制矢量之间的误差,根据实际钻进轨迹参数,得出了一种误差定量化分析、产生误差综合作用方向角度和强度的简便计算方法。如果可以确知误差产生于地层自然造斜作用,该方法还可用于地层的各向异性分析和自然造斜作用分析。该方法在地质勘探多回次、短钻程定向钻进工程实践中取得了很好的应用效果,在随钻测量大钻程定向钻进轨迹的快速准确调整中也具有应用价值。

In the directional drilling,the practical trajectory of the well is often inconsistent with the projected objective.The quantitative analysis of the error is crucial for the track adjustment and accuracy control.According to the principle of the vector manipulation in directional drilling,the vector error between the practical drilling direction of the deflection tool and the controlled direction of the designed well has been studied in this paper.Based on the practical drilling trajectory parameters,a simple calculation method for the quantitative analysis of the error and the directional angle and intensity of the comprehensive effects which produce the error has been deduced.The method can be used to analyze the aeolotropy and the natural oblique effect of strata if it is sure that the error is produced by stratum deflecting characteristics.The method has been used successfully in the directional drilling projects of multi-trip and short-roundtrip.Furthermore,it is of the practical value for the trajectory accurate adjustment in the long-roundtrip engineering of measurements while drilling