仿射坐标系在钻柱动力学中的应用

摘要

三维井眼中转动钻柱受力分析是钻柱动力学理论研究中的难点，首先要处理三维弯曲井眼中钻柱的初始弯曲，而且在分析过程中要考虑弯曲井眼方位、井斜对钻柱接触力的影响．引入仿射坐标系，建立三维弯曲井眼中转动钻柱力学模型，分析弯曲井眼中转动钻柱变形、接触力及摩阻扭矩，为钻柱动力学理论研究提供一种新的方法．%During analyzing the drillstring dynamics in 3D borehole, initial bending of drillstring must to be dealed with. And the effects of position and deviation on contact force between the drillstring and borehole should be considered. Based on mechanical model of turning drillstring in 3D borehole, the affine coordinate system was introduced to analyze the deformation, contact force and friction torque. A new method was offered for study of drillstring dynamics.