注空气过程中井下管柱氧腐蚀规律及防护实验研究
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中国石化中原油田分公司石油工程技术研究院 河南 濮阳 457001

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TE357

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Experimental study on Oxygen Corrosion and Protective Measures of Downhole Stringin Air Injection Process
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Research Institute of Oil Production Engineering Technology,Zhongyuan Oilfield Company SINOPEC

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    摘要:

    氧腐蚀是限制注空气技术发展的重要因素之一。本文采用失重法以及XRD、EDS和SEM分析等方法,对注空气过程中井下管柱腐蚀规律及防护措施进行研究。结果表明:氧腐蚀速率随着氧分压增大而加快,即使常压空气下腐蚀速率仍高于行业标准;存在一个临界温度及矿化度条件,使氧腐蚀速率达到最高;流体流度增大有利于加剧腐蚀;腐蚀产物膜主要成分包括γ-FeO(OH)、β-FeO(OH)、Fe3O4、α-FeO(OH)等,结构疏松不致密,对钢体保护作用不大。需考虑多种防腐措施有效控制氧腐蚀,包括优选管材、利用润滑油脂对钢材表面进行处理、pH调整、加注缓蚀剂等。

    Abstract:

    Severe oxygen corrosion is one of the key factors that limit the advance of the air injection technology for EOR in the oil field. In this study, methods of weight loss, XRD analysis, EDS analysis and SEM analysis were used to clarify the corrosion law and protective measures of downhole string in air injection process. The experimental results indicate that oxygen corrosion rate increases with rising pressure, even at the atmospheric condition steels also suffer severe corrosion with the rate much larger than the industrial standard (0.076mm/a). There exist a critical temperature and a critical salinity at which the oxygen corrosion rate can reach the largest. In addition, increasing fluid flow rate is also conducive to oxygen corrosion. The main elements of corrosion products are γ-FeO(OH), β-FeO(OH), Fe3O4 and α-FeO(OH). The structure of corrosion film is loose, therefore has little protective effect on steel matrix. The validity of the anti-oxygen corrosion measures has been verified. Various anti-corrosion measures should be considered to effectively control the oxygen corrosion of downhole string, including selecting high-quality steel type, the use of grease to treat the steel surface, pH adjustment, and filling or injecting corrosion inhibitor.

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引用本文

李晓东. 注空气过程中井下管柱氧腐蚀规律及防护实验研究[J]. 科学技术与工程, 2018, 18(35): .
Li Xiaodong. Experimental study on Oxygen Corrosion and Protective Measures of Downhole Stringin Air Injection Process[J]. Science Technology and Engineering,2018,18(35).

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  • 收稿日期:2018-06-14
  • 最后修改日期:2018-09-28
  • 录用日期:2018-10-10
  • 在线发布日期: 2018-12-24
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