摘要
套管磨损多呈"月牙形",其直接后果是降低套管的抗挤强度和抗内压强度,如何计算磨损套管的抗挤强度、抗内压强度制约着如何安全地设计套管柱。因此笔者对"月牙形磨损"套管在不同磨损程度时的周向应力进行研究,并重点对其抗内压强度的计算方法进行了探索。笔者以P110的95/8 in套管为例,建立了计算磨损套管周向应力的解析模型,并用弹塑性有限元方法建立了套管的有限元力学模型,通过有限元分析来验证解析模型的正确性,最后以此为基础得出了磨损套管的抗内压强度计算公式。
The casing wear is mostly crescent-worn,which reduces collapse strength and burst strength of the casing directly.How to estimate the burst strength of worn casing has a big effect on how to safely design casing strings.We analyze the hoop stress of crescent-worn casing in different wearing degree and focus on the calulation methods of burst strength.Take P110 95/8＂ casing for example,the analytical model of the hoop stress is first established,then the finite element mechanic model of casing is established with plastic-elasticity finite element method.The results of the analytical model agree well with the finite element analysis.Finally,the formula for calulating the burst strength of worn casing is obtained.
出处
《机械科学与技术》
CSCD
北大核心
2010年第4期476-479,共4页
Mechanical Science and Technology for Aerospace Engineering
基金
新世纪优秀人才支持计划项目(NCET-08-0907)
四川省杰出青年学科带头人培养基金项目(06ZQ026-028)
国家自然科学基金项目(50774063)
中国石油天然气集团公司应用基础研究项目(2008A-3005)资助
关键词
套管磨损
抗内压强度
有限元分析
casing wear
burst strength
finite element analysis（FEA）
