套管在对称载荷下其螺纹牙应力分布计算公式  

Stress Distribution Formula of Threads Casing Joint Under Symmetrical Load

作　　者：童华[1] 唐晓鸿 祝效华[1] 何欢 陶浩然 Tong Hua1, Tang Xiaohong1, Zhu Xiaohua1, He Huan2, Tao Haoran3(1. Mechanical and Electrical Engineering of Southwest Petroleum University, Chengdu 610500, China; 2. Sinopec Southwest Branch, Nanchong 637400, China; Material Supply Branch of Petro China Southwest Oil ＆ Gasfield Company, Chengdu 610051, China)

机构地区：[1]西南石油大学机电工程学院,成都610500 [2]中石化西南油气分公司川东北采气场,南充637400 [3]中国石油西南油气田物资分公司,成都610500

出　　处：《系统仿真学报》2018年第10期4014-4020,共7页Journal of System Simulation

基　　金：国家自然科学基金(51674214;51004082);四川省青年科技创新团队项目(2017TD0014)

摘　　要：不通过有限元方法进行数值计算,要现场测出井下套管接头螺纹牙的载荷分布情况是很难实现的。这里假定一个变形协调因子Ux,借助一个初始计算值f0来表示螺纹牙应力:f(x)=f0Ux;并采用有限元软件计算出不同对称载荷下的螺纹牙载荷分布规律;通过曲线拟合得到Ux表达式,求得螺纹牙的应力计算公式。为现场提供了一种直观、快捷、准确的计算方法,也为套管接头的研发、制造提供理论参考依据。研究结果表明:套管螺纹牙Ux在单一对称载荷作用下不随载荷大小改变而改变;在复合对称载荷作用下,Ux有少量波动。While itis difficult tomeasure thestress distribution of casing threads underground without calculation by finite element method. Here assumes a deformation compatibility factor Ux, use an initial calculation to represent the thread stress, J（x）=f0Ux, and applythe ABAQUS finite element software to calculate the stress distribution of the threads under different symmetrical loads. Obtain the expressions of Ux by curve fitting, and get the threads stress calculation formula to provide an intuitive, fast and accurate method of calculation for the site. Providea theoretical reference for development and manufacture of casing joint. The research indicates： the deformation compatibility factor of casing threads don＇t change with the size of the load under a singlesymmetrical load, but it has a small amount of volatility under the complex symmetrical load.

关 键 词：套管接头 对称载荷 螺纹牙应力 变形协调因子 有限元 计算公式 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]