Abstract: This paper presents the governing equation of static behavior of a bottomhole assembly in 3-D space and the general solutions of their simplified modes. A vector model of rock-bit interaction is developed by accounting for the anisotropic drilling characteristics of both the formation and the bit.This paper discusses the basic principles of predicting and controlling the wellbore trajectory.

Key words: wellbore trajectory, bottonhole assembly, model, bit (rock), drillstring mechanics, calculating method

摘要： 对井眼轨迹控制问题的力学分析模型进行了讨论.给出了底部钻具组合三维受力和变形的控制方程及其简化形式的通解;综合考虑地层和钻头的各向异性钻井特性,建立了钻头与地层相互作用的一个矢量模型;讨论了井眼轨迹预测和控制计算方法.

关键词: 井眼轨迹, 钻具组合, 模型, 钻头(岩石), 钻柱力学, 计算方法