高温高压CO2驱采出液中N80碳钢局部腐蚀诱发机理
Initiation of Localized Corrosion on N80 Carbon Steel in High-pressure and High-temperature CO2 Enhanced Oil Recovery Production Fluids
摘 要
以胜利油田CO2驱采出液为模拟对象，研究了N80碳钢在10 MPa、80 ℃高温高压CO2油水混合介质中的腐蚀行为。结果表明：碳钢表面局部腐蚀初期形貌依赖于原油乳状液中微液滴的尺寸。当液滴尺寸较小时，在流动作用下液滴与碳钢表面接触时间较短，形成的腐蚀颗粒较小，局部蚀坑较浅；当液滴大于某一临界尺寸时，在流动作用下液滴趋于在碳钢表面形成扁平化变形和长时间润湿，形成的腐蚀产物呈现片状区域，局部腐蚀加剧。
N80钢
局部腐蚀
机理
油水乳状液
CO2 enhanced oil recovery
N80 steel
localized corrosion
mechanism
oil-water emulsion
Abstract
The corrosion behavior of N80 steel was investigated in an oil-water mixed condition at pressure of 10 MPa and temperature of 80 ℃, simulating the production fluids of CO2 enhanced oil recovery (EOR) in Shengli oilfield. It was found that the corrosion morphology was highly dependent on the size of water droplets in a water-in-oil emulsion. When water droplets were small, the contact time of water droplets on steel surface was short and the corrosion product particles were small, leading to shallow localized pits. When water droplets were larger than a critical size, water droplets might be flattened and could wet the surface for a longer time, producing a larger patch of corrosion product and accelerating corrosion damages.
中图分类号 TG174 DOI 10.11973/fsyfh-202104007
所属栏目 试验研究
基金项目 中石化科技攻关项目（P18088）
收稿日期 2019/6/22
修改稿日期
网络出版日期
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引用该论文: ZHANG Xing,ZHAO Lin,LIU Anqing,YANG Jinghui,HAN Xia,WANG Ziming,SONG Guang. Initiation of Localized Corrosion on N80 Carbon Steel in High-pressure and High-temperature CO2 Enhanced Oil Recovery Production Fluids[J]. Corrosion & Protection, 2021, 42(4): 36
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参考文献
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【4】王贝,贾巧燕,王赟,等. 壁面剪切力对缓蚀剂吸附脱附的影响研究[J]. 腐蚀与防护,2018,29:48-53.
【5】WANG Z M,LIU X T,HAN X,et al. Managing internal corrosion of mild steel pipelines in CO2 enhanced oil recovery multiphase flow conditions[J]. Energy Technology,2015(3):225-233.
【6】WANG Z L,ZHANG J,WANG Z M,et al. Emulsification reducing the corrosion risk of mild steel in oil-brine mixtures[J]. Corrosion Science,2014,86:310-317.
【7】孙冲,孙建波,王勇,等. 超临界CO2/油/水系统中油气管材钢的腐蚀机制[J]. 金属学报,2014,50:811-820.
【8】FARELAS F,CHOI Y S,NESIC S. Corrosion behavior of deep water oil production tubing material under supercritical CO2 environment: Part 2. Effect of crude oil and flow[C]//NACE Corrosion,[S.l.]:[s.n.],2013:2381.
【9】WICKS M,FRASER J P. Entrainment of water by flowing oil[J]. Mater Perform,1975,14:9-12.
【10】WANG Z M,ZHANG J. Corrosion of multiphase flow pipelines:The impact of crude oil[J]. Corrosion Reviews,2016,34:17-40.
【11】侯建国,路民旭,常炜. 原油对CO2腐蚀过程的影响及相应腐蚀速率预测研究进展[J]. 中国腐蚀与防护学报,2005,25:124-128.
【12】白羽,李自力,程远鹏. 集输管线钢在CO2/油/水多相流环境中的腐蚀行为[J]. 腐蚀与防护,2017,38:204-207.
【13】PAOLINELLI L D,NESIC S. Hydrodynamic and phase wetting criteria to assess corrosion risk in two-phase oil-water pipe flow[C]//NACE Corrosion,NACE International:Vancouver,2016:7408.
【14】PAOLINELLI L D,RASHEDI A,YAO J. Characterization of droplet sizes in large scale oil-water flow downstream from a globe valve[J]. International Journal of Multiphase Flow,2018,99:132-150.
【15】STORE M,PASSADE-BOUPAT N,BONIS M,et al. Inhibitive properties of crude oils:Can we count on them,NACE Corrosion,2011:11061,
【16】WANG Z M,LUN Q Y,WANG J,et al. Corrosion mitigation behavior of an alternately wetted steel electrode in oil/water media[J]. Corrosion Science,2019,152:140-152.
【17】LIU A Q,BIAN C,WANG Z M,et al. Flow dependence of steel corrosion in supercritical CO2 environments with different water concentrations[J]. Corrosion Science,2018,134:149-161.
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【19】SUN J,SUN C,ZHANG G,et al. Effect of water cut on the localized corrosion behavior of P110 tube steel in supercritical CO2/oil/water environment[J]. Corrosion,2016,72:1470-1482.
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