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

doi:10.12422/j.issn.1672-6952.2024.01.008

Journal of Liaoning Petrochemical University ›› 2024, Vol. 44 ›› Issue (1): 49-54.DOI: 10.12422/j.issn.1672-6952.2024.01.008

• Oil and Gas Engineering • Previous Articles Next Articles

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

Jiaxu WANG¹(), Qi LIU², Jianghua TAO², Dongxu SUN¹, Chunxiao ZHANG¹, Yulin YAN³, Zhiyong HU¹()

^1.College of Petroleum Engineering，Liaoning Petrochemical University，Fushun Liaoning 113001，China
^2.Northeast Branch Control Center of Oil and Gas Control Center of National Pipeline Network Group，Shenyang Liaoning 110000，China
^3.The Shale Oil Plant of Fushun Mining Group Co. ，Ltd. ，Fushun Liaoning 113115，China

Received:2023-02-20 Revised:2023-03-23 Published:2024-02-25 Online:2024-02-07
Contact: Zhiyong HU

冷热原油顺序输送管道热应力与疲劳寿命分析

王佳旭¹(), 刘祁², 陶江华², 孙东旭¹, 张春晓¹, 闫玉麟³, 胡志勇¹()

^1.辽宁石油化工大学石油天然气工程学院，辽宁抚顺 113001
^2.国家管网集团油气调控中心东北分控中心，辽宁沈阳 110000
^3.抚顺矿业集团有限责任公司页岩炼油厂，辽宁抚顺 113115

通讯作者: 胡志勇
作者简介:王佳旭（1996⁃），男，硕士研究生，从事冷热原油顺序输送工艺方面的研究；E⁃mail：1340957936@qq.com。
基金资助:
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)

Abstract

Abstract:

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.

Key words: Stress analysis, Buried piping, Crack propagation life, Thermal stress, Sequential conveying

摘要：

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。

关键词: 应力分析, 埋地管道, 裂纹扩展寿命, 热应力, 顺序输送

CLC Number:

TE832

Jiaxu WANG, Qi LIU, Jianghua TAO, Dongxu SUN, Chunxiao ZHANG, Yulin YAN, Zhiyong HU. Thermal Stress and Fatigue Life Analysis of Cold and Hot Crude Oil Pipeline[J]. Journal of Liaoning Petrochemical University, 2024, 44(1): 49-54.

王佳旭, 刘祁, 陶江华, 孙东旭, 张春晓, 闫玉麟, 胡志勇. 冷热原油顺序输送管道热应力与疲劳寿命分析[J]. 辽宁石油化工大学学报, 2024, 44(1): 49-54.

Figures/Tables 9

Table1 Pipeline parameters of Qingtie Line4

参数	数值
管径/mm	711
壁厚/mm	8.0
弹性模量/Pa	2.06 $×$ 10⁵
泊松比	0.3
线胀系数/℃^-1	1.2 $×$ 10^-5
传热系数/（W $⋅$ m^-1·K^-1）	14.7

Table1 Pipeline parameters of Qingtie Line4

参数	数值
管径/mm	711
壁厚/mm	8.0
弹性模量/Pa	2.06 $×$ 10⁵
泊松比	0.3
线胀系数/℃^-1	1.2 $×$ 10^-5
传热系数/（W $⋅$ m^-1·K^-1）	14.7

Fig.1 Grid division of straight pipe sections

Fig.2 Thermal stress distribution of straight pipe sections at different temperatures

Fig.3 Analysis of thermal stress on the surface of straight pipe sections in pipelines

Fig.4 Stress distribution of straight pipe under the combined action of temperature difference and pressure

Fig.5 Grid division of bent pipe section

Fig.6 Thermal stress distribution in elbow section at different temperatures

Fig.7 Thermal stress distribution of elbow under the combined action of temperature difference and pressure

Fig.8 Semi elliptical crack form

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

冷热原油顺序输送管道热应力与疲劳寿命分析

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