Numerical evaluation of the effectiveness of frost heave mitigation strategies for chilled arctic gas pipelines

作     者：XinZe Li QingBai Wu HuiJun Jin Rui Shi Gang Wu YaPeng Cao XinZe Li;QingBai Wu;HuiJun Jin;Rui Shi;Gang Wu;YaPeng Cao

作者机构：State Key Laboratory of Frozen Soils EngineeringNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China College of Resources and EnvironmentUniversity of Chinese Academy of SciencesBeijing 100049China Department of Chemical and Material EngineeringUniversity of AlbertaEdmontonAB T6G1H9Canada School of Civil Engineering/Northeast-China Observatory and Research-Station of Permafrost Geo-Environment–Ministry of Education/Institute of Cold-Regions EngineeringScience and TechnologyNortheast Forestry UniversityHarbinHeilongjiang 150040China Department of Oil&Gas Storage and Transportation EngineeringSchool of EngineeringChina University of Petroleum-Beijing at KaramayXinjiang Uygur Autonomous Region 834000China 

出 版 物：《Research in Cold and Arid Regions》 (寒旱区科学（英文版）)

年 卷 期：2022年第14卷第5期

页      面：338-345页

核心收录：

学科分类：0820[工学-石油与天然气工程] 080706[工学-化工过程机械] 08[工学] 0807[工学-动力工程及工程热物理] 0705[理学-地理学] 082003[工学-油气储运工程] 

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA20100103) 

主　　题：Permafrost Chilled gas pipeline Temperature field Numerical assessment 

摘      要：To prevent the thawing of ice-rich permafrost,it is suggested that gas should be transported in a chilled state(below the freezing temperature)in pipelines buried in ***,frost heave occurs when water migrates towards the chilled pipeline and ice lenses grow underneath the *** might endanger the integrity of the pipeline and the environment as ***,innovative frost heave mitigation measures are required when designing the pipeline,especially those sections in discontinuous permafrost or near the compressor sta­*** ground temperature field in response to the operation of a proposed chilled gas pipeline traversing permafrost regions in Alaska was simulated by a pipe-soil thermal interaction geothermal *** heave mitigation measures,including insulation around the pipe,flat slab insulation under the pipe,and heating cables combined with slab insulation,were evaluated for chilled pipeline operation in seasonally varying ambient *** numerical results show that the minimum temperature of the observation point at 2.5 m below the pipe bottom increases by 17%,29%,and 48%when the thermal conductivity of the outer insulation layer is 0.1,0.05,and 0.02 W/(m K),*** flat slab insulation,the thermal field is less sensitive to varying slab thicknesses than to varying thermal conductivity,implying the thermal conductivity,not the thickness,is the crucial ***,the heat flow could be redirected from vertical to horizontal by flat slab *** electrical heating cables could be regarded as a new heat source to balance the heat removal rate of the soil around the chilled *** minimum temperature of the observation point at 1.1 m below the bottom of the pipe increases from-15.2℃to-3.0,1.5,and 7.5℃,corresponding to the heating cable power of 20,30,and 40 W,respectively,with the power of 30 W deemed appropriate for the study *** is concluded that heating cables in combination with insulation