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Investigations on the oxygen corrosion behaviors of P110 steel in a dynamic experiment simulating nitrogen injection
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-01-31 , DOI: 10.1002/maco.202011490 Zhiming Yu 1 , Dezhi Zeng 1 , Yuanhua Lin 1 , Guangwen Zeng 2 , Yibo Feng 2 , Baodong Ding 2 , Haixia Li 2
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-01-31 , DOI: 10.1002/maco.202011490 Zhiming Yu 1 , Dezhi Zeng 1 , Yuanhua Lin 1 , Guangwen Zeng 2 , Yibo Feng 2 , Baodong Ding 2 , Haixia Li 2
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Nitrogen injection is widely applied to enhance oil recovery, but the corrosion failure risk of tubing and casing is increased by residual oxygen in nitrogen. In this study, the corrosion behaviors of P110 steel under dynamic conditions with different oxygen partial pressures (2.5–0.003 MPa) simulating high‐pressure (30 MPa) nitrogen injection were studied. The morphology and composition of corrosion products were characterized by scanning electron microscopy, energy‐dispersive X‐ray spectroscopy and energy‐dispersive X‐ray analysis methods; furthermore, the localized corrosion rate and three‐dimensional surface morphologies were analyzed. The results show that the general corrosion rate decreased significantly with decreasing O2 partial pressure, especially when O2 partial pressure was below 0.5 MPa, and there is a corrosion morphology change from general corrosion to localized corrosion (pitting). Besides, the localized corrosion rates are about 20 times the general corrosion rates. The corrosion products are mainly FeOOH and Fe3O4. In addition, the scales in the intact area are relatively flat and dense, whereas the damaged scales are porous and brittle. Fluid flows not only changed the morphologies and microstructures, resulting in a more protective product layer but also promoted the transfer of the corrosive mediators and affected the development of localized corrosion.
中文翻译：
模拟注氮动态实验中P110钢的氧腐蚀行为研究
氮气注入被广泛应用于提高采油率，但是氮气中残留的氧气会增加管道和套管的腐蚀失效风险。在这项研究中，研究了P110钢在动态条件下模拟高压（30 MPa）氮气注入时在不同氧分压（2.5-0.003 MPa）下的腐蚀行为。腐蚀产物的形貌和组成通过扫描电子显微镜，能量色散X射线光谱法和能量色散X射线分析方法表征。此外，分析了局部腐蚀速率和三维表面形貌。结果表明，总体腐蚀速率随O 2分压的降低而显着降低，特别是当O 2降低时。分压低于0.5 MPa，并且腐蚀形态发生了从一般腐蚀到局部腐蚀（点蚀）的变化。此外，局部腐蚀速率约为一般腐蚀速率的20倍。腐蚀产物主要是FeOOH和Fe 3 O 4。另外，完整区域中的水垢相对平坦且致密，而损坏的水垢则多孔且易碎。流体流动不仅改变了形貌和微观结构，形成了更具保护性的产品层，而且还促进了腐蚀介质的转移并影响了局部腐蚀的发展。
更新日期：2020-01-31
中文翻译：
模拟注氮动态实验中P110钢的氧腐蚀行为研究
氮气注入被广泛应用于提高采油率，但是氮气中残留的氧气会增加管道和套管的腐蚀失效风险。在这项研究中，研究了P110钢在动态条件下模拟高压（30 MPa）氮气注入时在不同氧分压（2.5-0.003 MPa）下的腐蚀行为。腐蚀产物的形貌和组成通过扫描电子显微镜，能量色散X射线光谱法和能量色散X射线分析方法表征。此外，分析了局部腐蚀速率和三维表面形貌。结果表明，总体腐蚀速率随O 2分压的降低而显着降低，特别是当O 2降低时。分压低于0.5 MPa，并且腐蚀形态发生了从一般腐蚀到局部腐蚀（点蚀）的变化。此外，局部腐蚀速率约为一般腐蚀速率的20倍。腐蚀产物主要是FeOOH和Fe 3 O 4。另外，完整区域中的水垢相对平坦且致密，而损坏的水垢则多孔且易碎。流体流动不仅改变了形貌和微观结构，形成了更具保护性的产品层，而且还促进了腐蚀介质的转移并影响了局部腐蚀的发展。
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