摘要
为了解固井附件(球座、浮箍)在超深井环境作业时发生的腐蚀失效问题,使用高温高压反应釜模拟超深井环境(220℃、30%NaCl、pH值14),采用失重法、扫描(SEM)、X射线衍射仪(XRD)和能谱仪(EDS)等测试方法,研究了2A12铝合金在超深井环境下的腐蚀行为。结果表明:2A12铝合金的腐蚀产物主要有Al_(2)O_(3)、Al(OH)_(3)、NaAlO_(2)和NaAl_(5)O_(8)(β''-Al_(2)O_(3))等物质,随着腐蚀反应的进行,腐蚀产物变化;其腐蚀过程是从局部的碱性点蚀开始,逐渐发展为晶间腐蚀,最后演变为应力腐蚀,并出现腐蚀开裂的现象。且随着腐蚀时间的延长,2A12铝合金表面微裂纹逐渐增多、变宽。可通过在2A12铝合金基体制备防腐膜层的方式,提高2A12铝合金在超深井环境中的耐腐蚀能力。
In order to understand the corrosion failure of cementing accessories(ball seat,floating collar)in ultra-deep well environment,a high temperature and high pressure reactor was used to simulate the ultra-deep well environment(220℃,30%NaCl,pH value of 14).The corrosion behavior of 2A12 aluminum alloy in ultra-deep well environment was studied by mass loss method,scanning electron microscope(SEM),X-ray diffractometer(XRD)and energy dispersive spectrometer(EDS).The results show that the corrosion products of the alloy are mainly Al_(2)O_(3),Al(OH)_(3),NaAlO_(2)and NaAl_(5)O_(8)(β''-Al2O),etc,and the corrosion products change with the corrosion reaction.The corrosion process starts from local alkaline pitting corrosion,gradually develops into intergranular corrosion and finally evolves into stress corrosion,and corrosion cracking occurs.With the extension of corrosion time,the microcracks on the surface of 2A12 aluminum alloy gradually increase and widen.The corrosion resistance of 2A12 Al alloy in ultra-deep well environment can be improved by preparing anti-corrosion film on 2A12 aluminum alloy substrate.
作者
吴欣袁
黄扬
李秀兰
田晓勇
蒋本强
WU Xinyuan;HUANG Yang;LI Xiulan;TIAN Xiaoyong;JIANG Benqiang(College of Mechanical Engineering,Sichuan University of Science&Engineering,Yibin 644005,China;CNPC Bohai Drilling Engineering Company Limited,Tianjin 300280,China)
出处
《热加工工艺》
北大核心
2025年第23期113-118,125,共7页
Hot Working Technology
基金
四川省科技厅项目(2022NSFSC1154)
四川轻化工大学“652”科研创新团队项目(SUSE652A10)。
关键词
2A12铝合金
超深井环境
腐蚀行为
2A12 aluminum alloy
ultra-deep well environment
corrosion behavior
