油气管道CO2腐蚀过程中弹状流的影响
EFFECT OF SLUG FLOW ON CO2 CORROSION OF PIPELINE IN OIL AND GAS INDUSTRY
摘 要
通过分析弹状流近壁面处的动力边界层和扩散边界层及弹状流对管壁CO2腐蚀的影响,发现弹状流动特性对管壁的质量传递、动量交换、管壁处的电化学腐蚀以及腐蚀产物膜的形成和破坏有显著的影响作用.提出弹状流动形态和CO2腐蚀产物膜特性是管壁腐蚀速率和腐蚀形态的重要影响因素,弹单元内的壁面切应力变化特性、正应力变化特性、壁面传质变化特性以及电化学腐蚀特性的非线性耦合作用是油气管道内壁CO2腐蚀的重要影响因素.在此基础上阐述了CO2腐蚀产物膜的微观结构、力学特性以及膜内的传质特性对腐蚀产物膜的形成、破坏以及修复作用.
CO2腐蚀
腐蚀产物膜
Slug flow
Carbon dioxide corrosion
Corrosion product film
Abstract
Based on the analysis of hydrodynamic boundary layer and diffusion boundary layer,the effects of slug flow on mass transfer of corrosive species to and of corrosion products from the wall,momentum interchange,electrochemical reaction and corrosion product film were obtained.It is suggested that the non-linear coupling of the characteristics such as the normal stress,shear stress,mass transfer coefficient and electrochemical reaction,has important effect on the CO2 corrosion of pipeline.The key roles of microstructure,mechanical properties,mass transfer of the corrosion product film in the process of corrosion product film’s formation,damage and repair are also clarified.
中图分类号 TG172
所属栏目 专论
基金项目 国家自然科学基金重点项目(50231020),国家自然科学基金面上项目(10372077)
收稿日期 2006/3/23
修改稿日期 2006/7/10
网络出版日期
作者单位点击查看
引用该论文: ZHENG Dong-hong,CHE De-fu,HE Lin,LU Min-xu. EFFECT OF SLUG FLOW ON CO2 CORROSION OF PIPELINE IN OIL AND GAS INDUSTRY[J]. Corrosion & Protection, 2007, 28(2): 77～82
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参考文献
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【2】Furuholt E M.Multiphase flow technology: is it of interest for future field developments?[C]//Froc Eur Pet Conf.London Engl: s.n.,1988:237-248.
【3】Green A S,Johnson B V,Choi H.Flow-related corrosion in large-diameter multiphase flow line[C]//SPE 20685,1990.
【4】Zhou X,Jepson W P.Study in three-phase oil/water/gas slug flow in horizontal pipes[C]//Corrosion/94.New Orleans LA: NACE International,1994.
【5】夏国栋,胡明胜,周芳德.两相弹状流中液弹及气泡合并情况的研究[J].西安交通大学学报,1997,31(6):52-56.
【6】Bugg J D,Saad G A.The velocity field around a taylor bubble rising in a stagnant viscous fluid: numerical and experimental results[J].International Journal of Multiphase Flow,2002(28):791-803.
【7】Taitel Y,Barnea D,Dukler A E.Modeling flow pattern transition for steady upward gas-liquid flow in vertical tube[J].AICHE J.,1980,26(3):345-354.
【8】Dayalan E,Vani G,Shadley J R,et al.Modeling CO2 corrosion of carbon steels[C]//Corrosion/95.Orlando FL: NACE International,1995:118.
【9】Wang H,Vedapuri D,Cai J Y,et al.Mass transfer coefficient measurement in water/oil/gas multiphase flow[J].ASME Journal of Energy Resources Technology,2001,123(2):144-149.
【10】Heuer J K,Stubbins J F.An XPS characterization of FeCO3 films from CO2 corrosion[J].Corrosion Sci,1999,41:1231.
【11】Vuppu A K,Jepson W P.The effect of temperature in sweet corrosion of horizontal multiphase carbon steel pipelines[C]//SPE 28809.Melbourne Australia: s.n.,1994.
【12】Schmitt G,Gudde T.Local mass transfer coefficients and local wall shear stresses at flow disturbances[C]//Corrosion/95.Orlando FL: NACE International,1995:102.
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