110SS油管钢在高酸性气藏环境下的腐蚀行为  

Corrosion Behavior of 110SS Tubing Steel in Highly Acidic Gas Reservoir Environment

作　　者：陈治宇 黄本生[1,2] 唐景黎 左寒阳 CHEN Zhiyu;HUANG Bensheng;TANG Jingli;ZUO Hanyang(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;Sichuan Engineering Technology Research Center of Basalt Fiber Composites Development and Application,Chengdu 610500,China;Material Corrosion and Protection Key Laboratory of Sichuan Province,Zigong 643000,China)

机构地区：[1]西南石油大学新能源与材料学院,四川成都610500 [2]四川省玄武岩纤维复合材料及开发应用工程技术研究中心,四川成都610500 [3]材料腐蚀与防护四川省重点实验室,四川自贡643000

出　　处：《材料保护》2024年第10期27-34,共8页Materials Protection

基　　金：国家自然科学基金(52376076);材料腐蚀与防护四川省重点实验室开放基金(2023CL13)资助。

摘　　要：110SS钢因其优异的耐腐蚀性能和强度,在酸性环境的气藏油管材料中被广泛应用。为深入理解其在高酸性气藏环境中的腐蚀行为,将110SS油管挂片放置于高温高压反应釜中进行CO_(2)/H_(2)S环境模拟腐蚀实验,并利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、能谱仪(EDS)、电化学测量等手段对其腐蚀产物形貌、腐蚀速率、物相、元素含量及电化学行为进行研究。结果表明,在72~168 h腐蚀时间内,110SS油管的腐蚀速率呈幂函数变化规律,并随着腐蚀时间的延长而降低;72 h时试样表面出现黄褐色的点状腐蚀产物,120 h时黄褐色腐蚀产物出现大面积脱落,以新出现的灰色腐蚀产物为主,168 h时呈现出分布均匀的青色腐蚀产物;110SS钢腐蚀产物主要有S、FeS_(1-x)、Fe_(1-x)S、FeS、Fe_2O_(3)、Fe_3O_4、FeCl_3、FeCO_(3)等;此外,自腐蚀电流密度随着腐蚀时间的延长而增加。研究结果有助于更好地了解110SS油管钢在高酸性气藏环境中的腐蚀行为。110SS steel is widely used in gas reservoir tubing materials in acidic environments owing to its excellent corrosion resistance and strength.In order to deeply understand its corrosion behavior in high acid gas reservoir environment,the 110 SS tubing coupon was placed in a high temperature and high pressure reactor for carrying out CO_(2)/H2S environment simulation corrosion experiments.The morphology,corrosion rate,product phase,element contents and electrochemical behavior of the corrosion products were studied by means of scanning electron micro-scope(SEM),X-ray diffractometer(XRD),energy dispersive spectrometer(EDS)and electrochemical measurement.Results showed that during the corrosion time of 72~168 h,the corrosion rate of 110SS tubing followed a power function variation pattern and decreased with the prolongation of corrosion time.At 72 h,yellow brown point corrosion products appeared on the surface of the sample.At 120 h,large areas of yellow brown corrosion products peeled off,mainly newly appearing gray corrosion products.At 168 h,uniformly distributed blue corrosion products appeared.Moreover,the corrosion products of 110SS steel mainly include S,FeS1-x,Fe1-x S,FeS,Fe2 O3,Fe3 O4,FeCl3,FeCO3,etc.,and the self-corrosion current density increased with the prolongation of corrosion time.In general,the results are helpful to better under-stand the corrosion behavior of 110SS tubing in highly acidic gas reservoir environment.

关 键 词：110SS油管钢 CO_(2)/H_(2)S 高酸性 电化学 

分 类 号：TG172[金属学及工艺—金属表面处理]