摘要
超临界CO_(2)管道在停输和再启动等瞬态过程中,流体易发生相变,密度、比热容等物性参数会发生阶跃式变化,使得管内的CO_(2)流体体积发生剧烈波动,将对管道产生脉动冲击,危害管道安全。为了明确超临界CO_(2)管道安全停输时间的影响因素,从安全控制的角度出发,首先结合超临界CO_(2)物性、相图和准临界性质,确定了超临界CO_(2)管道安全停输时间的定义,从管道停输开始至管内任一点流体进入气液共存区的时间;然后依托新疆油田CO_(2)管输示范工程,分别采用商业软件和MATLAB编程的方式,建立超临界管输水力热力计算模型,探究了管道停输及再启动过程中管内温度、压力、密度及相态协同变化波动规律;最后采用因素轮换法研究了主要工艺参数和环境参数对管道安全停输时间的影响规律。结果表明:降低首站出站温度、提高管道运行压力、较高土壤环境温度、较低管土总传热系数有助于延长超临界CO_(2)管道的安全停输时间。研究结果可为超临界CO_(2)管道安全运行提供一定理论支持和技术保障。
In the transient process of supercritical CO_(2)pipeline shutdown and restart,the fluid is prone to phase change,and physical property parameters such as density and specific heat capacity may appear step variation,resulting in drastic fluctuations of CO_(2)fluid volume in the pipeline,which may cause pulsating impact on the pipeline and endanger pipeline safety.In order to clarify the factors affecting safe shutdown time of supercritical CO_(2)pipeline,from the perspective of safety control,the safe shutdown time of supercritical CO_(2)pipeline is firstly defined by combining supercritical CO_(2)physical properties,phase diagram and quasi-critical properties:from the beginning of pipeline shutdown to the time at any point in the pipeline when fluid enters gas-liquid coexistence zone.Based on CO_(2)pipeline transportation demonstration project of Xinjiang Oilfield,hydraulic-thermodynamic calculation model for supercritical pipeline transportation is established by respectively using commercial software and MATLAB programming to investigate the cooperative changes law of temperature,pressure,density and phase state in pipeline during shutdown and restart.Finally,the influence of main process parameters and environmental parameters on safe shutdown time of pipeline is studied by factor rotation method.The results show that reducing initial station outlet temperature,increasing pipeline operation pressure,high soil temperature and low total heat transfer coefficient are helpful to prolong the safe shutdown time of supercritical CO_(2)pipeline.The research provides theoretical and technical support for safe operation of supercritical CO_(2)pipeline.
作者
李欣泽
孙佳奇
袁亮
张超
王梓丞
孙晨
董正淼
张海帆
孙颖婷
邢晓凯
熊小琴
邹炜杰
LI Xinze;SUN Jiaqi;YUAN Liang;ZHANG Chao;WANG Zicheng;SUN Chen;DONG Zhengmiao;ZHANG Haifan;SUN Yingting;XING Xiaokai;XIONG Xiaoqin;ZOU Weijie(School of Engineering,China University of Petroleum(Beijing)at Karamay,Karamay 834000,China;Xinjiang Key Laboratory of multi-medium Pipeline Safety Transportation,Urumqi 830001,China;Develop-ment Company of PetroChina Xinjiang Oilfield Company,Karamay 834000,China;Infrastructure Con-struction Engineering Department of PetroChina Xinjiang Oilfield Company,Karamay 834000,China;Oil Production Technology Research Institute,PetroChina Xinjiang Oilfield Company,Karamay 834000,China)
出处
《大庆石油地质与开发》
CAS
北大核心
2024年第6期136-147,共12页
Petroleum Geology & Oilfield Development in Daqing
基金
中国石油大学(北京)克拉玛依校区科研启动基金(XQZX20230021)
新疆维吾尔自治区自然科学基金资助项目“二氧化碳管道停输再启动温压协同变化机理与安全控制理论研究”(2023D01A19)
克拉玛依市创新环境建设计划(创新人才)项目“管输二氧化碳瞬变过程温压及相态协同变化机理和安全控制研究”(20232023hjcxrc0001)
新疆维吾尔自治区“天池英才”引进计划(TCYC12)
新疆维吾尔自治区“一事一议”引进战略人才项目(XQZX20240054)
新疆天山创新团队“油气高效管输技术研究与应用创新团队”(2022TSYCTD0002)。
关键词
超临界CO_(2)
管道输送
瞬变特性
停输再启动
相变
安全停输时间
supercritical CO_(2)
pipeline transportation
transient characteristics
shutdown and restart
phase transition
safe shutdown time
