膨胀套管计算机仿真分析  

COMPUTER SIMULATING ANALYSIS OF EXPANDABLE CASING

作　　者：练章华[1] 施太和[1] 杨龙 高智海 董范[3] 李渊[3] 徐英[4] 叶林祥[4] 

机构地区：[1]西南石油学院 [2]CNPC西安管材研究所 [3]华北油田采油五厂 [4]四川石油管理局川西南矿区

出　　处：《天然气工业》2003年第4期41-43,共3页Natural Gas Industry

基　　金：国家自然科学基金项目 (批准号 :5 0 0 74 0 2 5 );CNPC管线力学重点实验室预研探索项目;四川省青年科技基金资助。

摘　　要：膨胀套管在我国还处于探索研究阶段 ,文章用弹塑性有限元接触问题建立了可膨胀套管膨胀过程的力学模型 ,对N80钢级材料的 114 .3mm套管膨胀至 139.7mm进行了膨胀过程详细的计算机仿真研究 ,给出了摩擦系数为 0 .0、0 .0 5、0 .1和 0 .15时 ,膨胀套管内等效应力、套管内的残余应力随活塞位置变化的定量曲线。在大量数值模拟的基础上 ,得出了膨胀套管内的残余应力随摩擦系数的增大而减小的规律 ,最大等效应力发生在活塞锥体部分的膨胀套管内。The research on expandable casing is in an exploring stage in China at present.A mechanical model of the expanding process of expandable casing was set up in light of the elastoplastic finite element contact problem,by which a detail computer simulating study was carried out for N80 casing expanding process,i.e.expanding from 114.3 mm to 139.7 mm.The qualitative curves expressing the variation of the equivalent stresses and residual stresses in the expandable casing with the displacements of piston were acquired when the friction coefficient were o.o,0.05.0.1 and 0.15 respectively.On the basis of a lot of numerical simulations,it was concluded that the residual stresses in the expandable casing were decreased with the increase in the friction coefficients and the maximum equivalent stress occrred in the expandable casing of piston cone.These results are of great guiding significance for the structural design and lubricating design of the expandable casing.

关 键 词：膨胀套管 计算机仿真分析 油气井 摩擦系数 膨胀机构 力学模型 等效应力 

分 类 号：TE925[石油与天然气工程—石油机械设备]