N80钢在CO_(2)驱油采出水中的腐蚀行为研究  

Corrosion Behavior of N80 Steel in CO_(2) Flooding Produced Water

作　　者：解辉 于超 花靖 蒋秀 XIE Hui;YU Chao;HUA Jing;JIANG Xiu(State Key Laboratory of Chemical Safety,Qingdao 266100,China;SINOPEC Research Institute of Safety Engineering Co.,Ltd.,Qingdao 266100,China;Registration Center for Chemicals,Ministry of Emergency Management,Qingdao 266100,China)

机构地区：[1]化学品安全全国重点实验室,山东青岛266100 [2]中石化安全工程研究院有限公司,山东青岛266100 [3]应急管理部化学品登记中心,山东青岛266100

出　　处：《材料保护》2024年第10期68-77,共10页Materials Protection

基　　金：中国石油化工股份有限公司科技攻关项目(320144)资助。

摘　　要：为研究N80钢在生产阶段不同井深处的腐蚀行为,采用高温高压釜模拟CO_(2)驱油后采出井的腐蚀工况,通过失重法、扫描电镜(SEM)、三维光学测量分析等方法对腐蚀产物和腐蚀形貌进行了分析。结果表明:在CO_(2)分压为0 MPa时,N80钢的均匀腐蚀及小孔腐蚀速率均低于其他CO_(2)分压下的腐蚀环境的。随着井深的增加和CO_(2)分压的提高,N80钢的均匀腐蚀速率总体呈现先上升后下降的趋势;在井深600 m与2000 m时,最大点蚀速率与均匀腐蚀速率的变化趋势相同,在1200 m时最大点蚀速率随CO_(2)浓度的增加逐渐提高;随着井深和CO_(2)浓度的增加,N80钢的腐蚀产物膜变得更加致密并生成以FeCO_(3)为主的两层腐蚀产物膜。For investigate the corrosion behavior of N80 steel at different depths of wells during production,high-temperature and high-pressure reactors were used to simulate the corrosion conditions of CO_(2) flooding wells.The corrosion products and morphology were analyzed using methods such as weight loss,scanning electron microscopy(SEM),and three-dimensional optical measurement analysis.Results showed that at a CO_(2) partial pressure of 0 MPa,the uniform corrosion and pitting corrosion rates of N80 steel were lower than those in other corrosive environments under CO_(2) partial pressures.With the increase of well depth and CO_(2) partial pressure,the uniform corrosion rate of N80 steel showed an overall trend of first increasing and then decreasing.At depths of 600 m and 2000 m,the trend of maximum pitting corrosion rate and uniform corrosion rate was the same.At 1200 m,the maximum pitting corrosion rate gradually increased with the increase of CO_(2) concen-tration.Besides,with the increase of well depth and CO_(2) concentration,the corrosion product film of N80 steel became denser and formed a two-layer corrosion product film mainly composed of FeCO3.

关 键 词：N80钢 温度 CO_(2)分压 腐蚀产物膜 

分 类 号：TG172[金属学及工艺—金属表面处理]