J55钢在模拟CO_(2)注入井环空环境中的关键性腐蚀因素  

Critical Corrosion Factors for J55 Tubing Steel in a Simulated Annulus Environment of CO_(2)Injection Well

作　　者：崔怀云 刘智勇 卢琳 CUI Huaiyun;LIU Zhiyong;LU Lin(Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;Key Laboratory of Safety Evaluation of Steel Pipes and Fittings for State Market Regulation,Shijiazhuang 050000,China;State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan 114000,China)

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]国家市场监管重点实验室(钢制管子及管件安全评价),石家庄050000 [3]海洋装备用金属材料及其应用国家重点实验室,鞍山114000

出　　处：《材料研究学报》2024年第4期308-320,共13页Chinese Journal of Materials Research

基　　金：国家市场监督管理总局科技计划(2021MK020)。

摘　　要：基于实际CO_(2)驱注井环空环境计算环空参数、测试电化学和进行相关性分析,研究了环境总压、CO_(2)分压、pH值以及温度对J55钢腐蚀电化学行为的影响。结果表明,CO_(2)分压和温度是影响J55钢腐蚀速度的关键因素。CO_(2)分压与电荷转移电阻(Rct)显著相关,Spearman相关系数为-0.623;CO_(2)分压的升高使溶液的pH值降低从而促进析氢反应,使腐蚀速率提高。温度与Rct的相关行显著,Spearman相关系数为-0.692;温度的降低抑制材料的电化学反应活性且阻碍腐蚀产物膜的形成,减缓了J55钢的腐蚀。溶液初始pH值的降低能促进J55钢的腐蚀,但是温度和CO_(2)分压的影响可将其覆盖。CO_(2)-enchanced oil recovery technology has been widely used to enhance the profitability of oil fields.The leakage of CO_(2)into the annulus environment results in the formation of strong corrosive annulus fluid there,which is ineluctable.Due to the fluctuations of annulus environmental parameters in the practice,therefore,to simulate the annulus environment in the laboratory may be very difficult.Based on the parameters of the real annulus environment,the impact of total pressure,partial pressure of CO_(2)(PCO_(2)),pH value and temperature(T)etc.,on the corrosion behavior of J55 steel are investigated by means of numerical simulation in terms of the parameters,electrochemical test and correlation analysis.Results shows that the PCO_(2)and T are the critical factors influencing corrosion behavior.The Spearman correlation coefficient(r)between PCO_(2)and charge transfer resistance(Rct)is-0.623,where the significant level is 0.013(2-tailed),which means that the Rct is significantly correlated with the PCO_(2).The increasing PCO_(2)can decrease the pH value of the simulated annulus environment and accelerate the corrosion of J55 steel.The r between T and Rct is-0.692,where the significant level is 0.004(2-tailed),which means that the Rct is significantly correlated with the T.The decreasing temperature can reduce the reaction activity of J55 steel,mitigate the corrosion and restrict the formation of FeCO_(3)scale.The initial pH of the simulated solution has a little promoting effect on the corrosion of J55 steel,which may be covered by the effect of T and PCO_(2).

关 键 词：材料失效与保护 CO_(2)腐蚀 电化学 J55 钢 环空环境 

分 类 号：TG172[金属学及工艺—金属表面处理]