Volume 37 Issue 2
Apr.  2020
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ZHAO Guoxian, GAO Fei. Anti-Corrosion Behavior of TC4 Alloy In Organic Salt Completion Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 264-268. doi: 10.3969/j.issn.1001-5620.2020.02.022
Citation: ZHAO Guoxian, GAO Fei. Anti-Corrosion Behavior of TC4 Alloy In Organic Salt Completion Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 264-268. doi: 10.3969/j.issn.1001-5620.2020.02.022
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Anti-Corrosion Behavior of TC4 Alloy In Organic Salt Completion Fluid

doi: 10.3969/j.issn.1001-5620.2020.02.022

  • School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065

  • Received Date: 2020-02-25
  • Publish Date: 2020-04-28
    Abstract
  • Aiming at applicability of titanium alloy in harsh oilfield environment, the corrosion resistance and electrochemical corrosion behavior of TC4 titanium alloy in high temperature and high pressure completion fluid were studied with simulated corrosion weightlessness test and electrochemical test analysis. The results show that TC4 titanium alloy has high corrosion rate and poor corrosion resistance after 360 h corrosion in potassium formate completion fluid with total pressure of 10 MPa and density of 1.4 g/cm3. The corrosion rate reaches 0.1361 mm/a at 210℃. The anodic polarization curves of TC4 titanium alloy all have passivation zones at different temperatures. With the increase of temperature, the self-corrosion current density and corrosion tendency increase. The electrochemical impedance spectroscopy (EIS) has obvious arc capacitance characteristics. The charge transfer resistance decreases rapidly with the increase of temperature, and the protectivity of passive film decreases. This indicates that the corrosion resistance of TC4 titanium alloy in high temperature and high pressure potassium formate completion fluid decreases gradually.

     

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