本文介绍美国石油学会新颁布的套管、油管、钻杆双轴应力设计计算的新概念和新方法。文章指出新旧方法之间有很大区别,新方法更合理但也更复杂为此,本文给出了一个简单的计算机程序,使复杂计算变为方便可行文后附有英制换算法定计量单位与工程单位的最新套管特性表 This article introduces the new concepts and new methods of biaxial stress design and calculation of casing, tubing and drill pipe newly promulgated by the American Petroleum Institute. The article points out that there is a big difference between the old and the new methods. The new method is more reasonable but also more complicated. To this end, this article presents a simple computer program that makes complex calculations easy and feasible. Unit of the latest casing characteristics table