应用级数方程对套管挠曲变形的研究

A Study on the Casing Flexible Deformation with Series Equation

在定向井和弯曲井眼中,套管柱既受横向均布荷载的作用又同时受到轴向力的作用,因此应按纵横弯曲来描述其挠度曲线。本文应用三角级数的方法研究和推导出套管柱挠曲变形的挠曲方程及其求解方法。该方法具有计算精度高、简便易行、运算快捷的特点,更易于现场作业者接受。同时本文还阐明了与平台弯曲所不同的概念和区别,针对现场下套管作业的现行条件提出了不同的看法并进行了讨论。

In directional and bent wellbore, the casing strings are both suffered from the actions of horizontal even loading and axial force. So its flexible force should be described by verti-horizontal bending. The article, by using the method of triangle series,studies and derives the flexible equation for casing string and ways of solution. The method is of high precision, coveniently to be used, fast to be calculated and easily to be adopted by the field operators. Furthermore, the author illustrates the different concept and difference with the plane bending. Finally a different view for discussion is put forward to the casing operation for the time being.