摘要
基于钻柱接头与套管磨损试验结果,采用Dawson和White的能量损失磨损理论计算得到套管磨损系数。运用ABAQUS建立钻柱接头-套管偏磨的三维有限元模型,采用二次开发的Umeshmotion子程序和Arbitrary Lagrange-Euler自适应网格技术准确模拟钻进过程中的套管局部偏磨过程,并对磨损后的套管的剩余抗挤和抗内压强度进行分析。结果表明:套管磨损后的形状为"月牙形",且磨损最大深度与磨损时间呈非线性关系,而套管剩余强度与磨损最大深度近似呈线性关系;套管磨损对剩余抗挤强度影响最大,当剩余壁厚小于50%时,套管失去抵抗外挤作用的能力,但仍然具有一定的抗内压强度;发生偏磨后的套管被外挤和内压载荷作用而破坏的形式分别为挤扁毁坏和拉断毁坏。
Based on the experimental data of triction and wear test ot drill joint ana casmg,tne joint-casing wear cuclxJ- eient was calculated by using the energy loss wear theory of Dawson and White.The three dimensional （3D） finite element model of joint-casing eccentric wear was constructed by using ABAQUS. The process of casing partial eccentric wear in ing after wear was analyzed.The result of research demonstrates that the shape of worn casing is crescent, and the maximum wear depth by numerical simulation presents non-linear relationship with the time. Moreover the remaining strength of cas- ing presents approximate linear relationship with the increasing of the maximum wear depth.Casing wear impacts the remai- internal and external pressure.
出处
《润滑与密封》
CAS
CSCD
北大核心
2015年第6期25-31,共7页
Lubrication Engineering
基金
国家自然科学基金项目(50774063)
"十二五"国家科技重大专项(2011ZX05050)
关键词
石油套管
偏磨
剩余强度
破坏形式
oil casing
eccentric wear
remaining strength
failure behavior
