邹庆,廖柯熹,刘昕瑜,何国玺,冷吉辉,赵帅,彭沐霖.注蒸汽管道在CO2/O2/SO2环境中的腐蚀行为[J].表面技术,2022,51(7):225-235.
ZOU Qing,LIAO Ke-xi,LIU Xin-yu,HE Guo-xi,LENG Ji-hui,ZHAO Shuai,PENG Mu-lin.Corrosion Behavior of Steam Injection Pipeline in CO2/O2/SO2 Environment[J].Surface Technology,2022,51(7):225-235
注蒸汽管道在CO2/O2/SO2环境中的腐蚀行为
Corrosion Behavior of Steam Injection Pipeline in CO2/O2/SO2 Environment
  
DOI:10.16490/j.cnki.issn.1001-3660.2022.07.022
中文关键词:  CO2/O2/SO2体系  高温高压  腐蚀行为  温度  O2含量  力学性能
英文关键词:steam injection pipeline  CO2/O2/SO2 system  high temperature and pressure  corrosion behavior  temperature, O2 content
基金项目:
作者单位
邹庆 西南石油大学 石油与天然气工程学院,成都 610000 
廖柯熹 西南石油大学 石油与天然气工程学院,成都 610000 
刘昕瑜 四川菲思福石油天然气工程有限公司,成都 610000 
何国玺 西南石油大学 石油与天然气工程学院,成都 610000 
冷吉辉 西南石油大学 石油与天然气工程学院,成都 610000 
赵帅 西南石油大学 石油与天然气工程学院,成都 610000 
彭沐霖 西南石油大学 石油与天然气工程学院,成都 610000 
AuthorInstitution
ZOU Qing School of Oil and Gas Engineering, Southwest Petroleum University, Chengdu 610000, China 
LIAO Ke-xi School of Oil and Gas Engineering, Southwest Petroleum University, Chengdu 610000, China 
LIU Xin-yu Sichuan Faithful Petroleum and Natural Gas Engineering Co., Ltd., Chengdu 610000, China 
HE Guo-xi School of Oil and Gas Engineering, Southwest Petroleum University, Chengdu 610000, China 
LENG Ji-hui School of Oil and Gas Engineering, Southwest Petroleum University, Chengdu 610000, China 
ZHAO Shuai School of Oil and Gas Engineering, Southwest Petroleum University, Chengdu 610000, China 
PENG Mu-lin School of Oil and Gas Engineering, Southwest Petroleum University, Chengdu 610000, China 
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中文摘要:
      目的 揭示45#钢、3Cr钢在高温高压CO2/O2/SO2体系中的腐蚀行为及力学性能规律,为新疆油田注蒸汽管道的安全运行提供理论支撑。方法 基于注蒸汽管道现场运行工况,结合高温高压釜、结合扫描电子显微镜、3D显微镜、X射线衍射仪(XRD)等手段,进行失重测试、产物表征及拉伸测试试验。结果 随着温度(100~250 ℃)升高,45#钢、3Cr钢的腐蚀速率呈减小的趋势;随着O2含量(物质的量分数,0~3%)升高,45#钢、3Cr钢的腐蚀速率呈先增大后减小的趋势,在O2含量2%~3%时腐蚀受到抑制。XRD测试结果表明45#钢在CO2/O2/SO2体系中腐蚀产物主要包括FeSO4.H2O、FeCO3、Fe2O3,3Cr钢的腐蚀产物主要有Cr2O3、FeSO4.H2O、FeCO3、Fe2O3。3D显微镜结果显示45#钢基体表面存在较为明显的局部腐蚀缺陷,3Cr钢未出现局部腐蚀现象;力学性能结果显示45#钢腐蚀后抗拉强度减小1.36%,延伸率减小6.85%,3Cr钢腐蚀后抗拉强度减小0.39%,延伸率减小21.34%。结论 在高温高压CO2/O2/SO2环境中,SO2在腐蚀过程中占据主导地位;高温(100~250 ℃)下腐蚀产物膜致密,抑制腐蚀;O2参与阴极反应,在低浓度氧(0~2%)时腐蚀产物膜被破坏从而促进腐蚀,高浓度氧(2%~3%)时钢材基体钝化抑制腐蚀;腐蚀后钢材力学性能退化,腐蚀对钢材延伸率影响较大,对抗拉强度影响较小。
英文摘要:
      In order to reveal the corrosion behavior and mechanical properties of 45# steel and 3Cr steel in the high temperature and pressure CO2/O2/SO2 system, and provide theoretical support for the safe operation of steam injection pipelines in Xinjiang Oilfield. Based on the on-site operating conditions of the steam injection pipeline, combined with high temperature autoclave, combined with scanning electron microscope, 3D microscope, X-ray diffractometer (XRD) and other means, weight loss test, product characterization and tensile test are carried out. With the increase of temperature (100-250 ℃), the corrosion rate of 45# steel and 3Cr steel shows a decreasing trend; with the increase of O2 content (0-3mol%), the corrosion of 45# steel and 3Cr steel rate first increases and then decreases, and the corrosion is inhibited when the O2 content is 2mol%-3mol%. The XRD test results show that the corrosion products of 45# steel in the CO2/O2/SO2 system mainly include FeSO4.H2O, FeCO3, Fe2O3, and the corrosion products of 3Cr steel mainly include Cr2O3, FeSO4.H2O, FeCO3, and Fe2O3. The 3D microscope results show that 45# there are obvious local corrosion defects on the surface of the steel substrate, and 3Cr steel does not appear local corrosion; the mechanical properties show that the tensile strength of 45# steel after corrosion is reduced by 1.36%, the elongation is reduced by 6.85%, and the tensile strength of 3Cr steel after corrosion Reduced by 0.39%, elongation reduced by 21.34%. In the high temperature and pressure CO2/O2/SO2 environment, SO2 dominates the corrosion process; the corrosion product film is dense at high temperature (100-250 ℃), which inhibits corrosion; O2 participates in the cathodic reaction, and in the low concentration of oxygen (0-2mol%), the corrosion product film is destroyed to promote corrosion. When high concentration oxygen (2mol%-3mol%), the steel matrix is passivated to inhibit corrosion; after corrosion, the mechanical properties of the steel are degraded, and corrosion has a greater impact on the elongation of the steel. The tensile strength is less affected.
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