用能量法研究套管柱在定向井中的变形及挠曲方程

Study Deform of Casing String in Directional Drilling and Flexural Equation by Energy Method

本文针对目前国内有关文献提出的定向井中套管柱挠曲变形方程及其变形量的计算方法,指出了其概念上的差别及计算上存在的较大误差,并采用能量法求解定向井中套管柱的变形量并推导出挠曲变形方程。这对于准确描述套管柱的挠曲变形,精确计算套管挠曲变形量以及合理确定扶正器安放位置等,都提供了科学的依据。

In accordance with the directional well casing string flexural equation and its deform calculation this pa-per points out their difference in concept and notable calculation error,and uses energy method to solve direc-tional well casing string deform and its flexural equation. This method is clear in concept, calculated simply , results accurately in calculation, and used on site conveniently, which provides scientific fact for the correct discription of casing string flexural equation ,accurate calculation of casing flexural deform, and reasonable determination of centralizer position.