冷热原油顺序输送管道热应力与疲劳寿命分析

Thermal Stress and Fatigue Life Analysis of Cold and Hot Crude Oil Pipeline

王佳旭 刘祁 陶江华 孙东旭 张春晓 闫玉麟 胡志勇

Jiaxu WANG Qi LIU Jianghua TAO Dongxu SUN Chunxiao ZHANG Yulin YAN Zhiyong HU

辽宁石油化工大学 石油天然气工程学院，辽宁 抚顺 113001 国家管网集团油气调控中心 东北分控中心，辽宁 沈阳 110000 抚顺矿业集团有限责任公司 页岩炼油厂，辽宁 抚顺 113115

College of Petroleum Engineering，Liaoning Petrochemical University，Fushun Liaoning 113001，China Northeast Branch Control Center of Oil and Gas Control Center of National Pipeline Network Group，Shenyang Liaoning 110000，China The Shale Oil Plant of Fushun Mining Group Co. ，Ltd. ，Fushun Liaoning 113115，China

近年来，随着国外原油进口量的持续攀升以及国内油田产量的下降，管道输送出现了不同油品需要用同一条输油管线共同输送的情况。以庆铁四线管道为例，结合实际参数，应用ANSYS有限元分析方法，采用六面体结构性网格对管壁进行离散化处理，对埋地管道热结构耦合问题进行求解，分别计算了直管段和弯管段在不同温度下的热应力；基于断裂力学理论，计算了不同服役寿命下的年循环周期极限，分析了温度交替变化对管道疲劳寿命的影响。实验结果为冷热原油管道安全输送提供了理论依据。

In recent years, with the continuous increase of foreign crude oil imports and the decline of domestic oilfield production, different oil products may need to be transported together by the same oil pipeline during the transportation process.The fourth oil pipeline of Qingtie is taken as an example. Combined with the actual parameters, the pipe wall is discretized by using the finite element analysis method of ANSYS and the hexahedral structural grid. The thermal structure coupling problem of the buried pipeline is solved, and the corresponding thermal stresses of the straight pipe section and the bent pipe section at different temperatures are calculated respectively. Based on the theory of fracture mechanics,the number of annual limit cycles under different service life is calculated, and the influence of temperature alternation on pipeline fatigue life is analyzed, which provides a theoretical basis for the safe transportation of cold and hot crude oil pipelines.

辽宁省教育厅基本科研项目(LJKMZ20220734);辽宁省“兴辽英才计划”青年拔尖人才项目(XLYC1907059)

10.12422/j.issn.1672-6952.2024.01.008