沙丘地质下悬空输油管道力学特性分析  

Analysis on mechanical characteristics of suspended oil pipeline under sand dune geology

作　　者：吴玉国[1] 高勇飞 帕尔哈提·阿布都克里木 李小玲[1] 范开峰[1] 吴菠 WU Yuguo;GAO Yongfei;PAERHATI·Abudukelimu;LI Xiaoling;FAN Kaifeng;WU Bo(College of Petroleum Engineering,Liaoning Petrochemical University,Fushun 113001,China;PetroChina Experimental Testing Research Institute,Xinjiang Oilfield Company,Karamay 834000,China)

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001 [2]中国石油新疆油田公司实验检测研究院,新疆克拉玛依834000

出　　处：《中国石油大学学报（自然科学版）》2023年第6期146-153,共8页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(51904147);辽宁省高等学校创新人才支持计划项目(2020-68);辽宁省博士科研启动基金计划项目(2020-BS-227);辽宁省教育厅科学研究项目(L2020024)。

摘　　要：沙丘流动会导致埋地输油管道发生悬空,处于长距离悬空状态下的输油管道会发生断裂、变形等失效形式。为了探究输油管道在不同悬空状态下的力学特性,通过有限元分析软件ANSYS Workbench建立管-沙土有限元模型,在综合考虑沙土物理特性以及管-沙土非线性接触的基础上,基于热-流-固单向耦合方法分析处于不同工况下的悬空输油管道在多载荷作用下的应力变形特性,并对悬空输油管道的极限状态进行安全评估。结果表明:热应力对悬空输油管道力学特性的影响不可忽略;随着悬空长度增加最大Mises等效应力发生的位置由悬空中心处变为悬空段与埋地段的分界处;在考虑热应力的基础上,最大Mises等效应力随悬空长度增加呈现先增大后减小再增大的趋势;在综合影响下,算例中的悬空输油管道极限长度为77.41 m。Sand dune flow can cause buried oil pipelines to become suspended,and oil pipelines in a long distance suspended state may experience failure forms such as fracture and deformation.In order to explore the mechanical characteristics of oil pipe-lines under different suspended states,a finite element model of pipeline sand soil using the software ANSYS Workbench was es-tablished.Based on the comprehensive consideration of the physical characteristics of sand and the nonlinear contact between the pipeline and the sand,the stress and deformation characteristics of suspended oil pipelines under multiple loads under different working conditions were analyzed using the method of thermal-fluid-solid unidirectional coupling.Based on the above results,the safety assessment of the limit state of suspended oil pipelines was conducted.The results indicate that the influence of thermal stress on the mechanical properties of suspended oil pipelines cannot be ignored.As the length of the suspension increases,the lo-cation where the maximum Mises equivalent stress occurs changes from the center of the suspension to the boundary between the suspended section and the buried section.On the basis of considering thermal stress,the maximum Mises equivalent stress shows a trend of firstly increasing,then decreasing,and then increasing with the increase of the suspension length.Under the compre-hensive influence,the ultimate length of the suspended oil pipeline in the calculation example is 77.41 m.

关 键 词：沙丘流动 悬空管道 流-固-热耦合 安全评估 

分 类 号：X937[环境科学与工程—安全科学]