文献类型：期刊文献

中文题名：一种新型钻杆螺纹设计及应力分析

英文题名：Design of a New Tool Joint Thread and its Stress Analysis

作者：焦文鸿[1];高连新[1];鲁喜宁[2]

机构：[1]华东理工大学机械与动力工程学院;[2]上海海隆石油管材研究所

年份：2012

卷号：40

期号：6

起止页码：17

中文期刊名：石油机械

外文期刊名：China Petroleum Machinery

收录：CSTPCD;;北大核心:【北大核心2011】；

基金：上海市科学技术委员会科技特派员项目"石油钻杆接头应力分析及新型接头开发"(09QT1400100)

语种：中文

中文关键词：钻杆;螺纹接头;有限元分析;锥度

外文关键词：drill pipe ; tool joint thread ; finite element ; taper

摘要：针对应力集中导致石油钻杆螺纹产生疲劳裂纹,进而发生断裂失效事故的问题,在API接头的基础上,研究开发了一种新型钻杆螺纹接头。该新型螺纹结构主要改进之处是内螺纹锥度保持1∶6不变,外螺纹锥度变为1∶6.23。有限元分析结果表明,这种螺纹形式显著改善了接头受力情况,使得螺纹应力分布更加均匀,并降低了主台肩过渡圆角处的应力集中。对样品的上扣试验结果表明,采用新型螺纹后,外螺纹接头主台肩底部的过渡圆角处应力集中情况也得到明显改善,接头整体受力分布和不同区域应力差更趋平缓,降低了螺纹前几牙及主台肩过渡圆角处的应力集中情况,可大大延长接头使用寿命。
Stress concentration causes fatigue cracks on tool joint thread and thus causes fracture failure. Considering the problem, a new type of tool joint thread was developed on the basis of API joint. The major improvement of the new thread structure is that the internal thread taper remains unchanged as 1 ： 6 but the external thread taper changes into 1： 6.23. The finite element analysis shows that the thread form remarkably improves the force distribution of the joint to make the stress distribution on the thread more even and to decrease the stress concentration at the transitional fillet of the main shoulder. The experimental findings of the sample makeup show that when the new thread is adopted, the stress concentration at the transitional fillet at the bottom of the main shoulder of the external thread joint is improved remarkably. The difference between the whole force distribution of the joint and the stress in different zones becomes gentler, thus decreasing the stress concentration at the first teeth of the thread and the transitional fillet of the main shoulder and remarkably prolonging the service life of the tool joint.