Abstract: The change of curvature of the borehole of a directional well is teken place as the result of the action of side force on the bit.To solve the problem of a multi-stabilized bottomhole assembly by beam-column theory,it is considered as a multi-supported continuous beam-column.The present paper extends this method to that of its 3-dimensional analysis by resolving this complicated problem into two simple 2-dimensional ones to determine two components of side force which cause the changes of the angles of inclination and azimuth respectively.

摘要： 定向井的井身曲线在曲率上的变化是由于钻头在钻进时受到有侧向力作用的结果.“纵横弯曲法”把一个多稳定器的钻具组合当成为一个连续梁柱来分析.本文则将此法扩充应用于组合的三维分析而把一个较为复杂的三维问题分解为两个简单的二维问题以解出两个侧向力分量,其中一个要造成井斜角的变化,一个要造成方位角的变化.

关键词: 钻具组合, 三维分析方法, 纵横弯曲法, 侧向力, 井斜角, 方位角变化率, 钻头, 定向井, 稳定器, 三维问题