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<p>Corrosion has a significant economic and environmental impact on most oil sector facilities. One of the most widely used materials in these facilities is carbon steel. One major problem the oil sector faces is the corrosion and cracking of well motor housing of electrical submersible downhole pumps. These downhole pumps were used to inject water and thus raise production pressure. These pumps are mainly made of carbon steel and coated with epoxy as a corrosion-preventive method. Due to the high temperature and pressure, along with the presence of CO<sub>2</sub> and injected water compositions, these pumps failed within a year of installation. This study explores the synergistic effects of zinc-rich epoxy coatings and eco-friendly corrosion inhibitors in mitigating sweet corrosion conditions. Advanced electrochemical techniques, including Linear Polarization Resistance, Electrochemical Impedance Spectroscopy (EIS), and Potentiodynamic Polarization, were employed to assess the efficacy of various combinations. The research identifies optimal inhibitor concentrations and coating strategies that enhance the corrosion resistance of carbon steel in high temperature, high-pressure environments. Results demonstrate that integrating a zinc-rich epoxy coating with 1000 ppm of water-soluble inhibitor B significantly reduces corrosion rates, offering a sustainable and cost-effective solution. The findings contribute valuable insights into developing environmental approaches for the protection of oilfield equipment, ensuring operational reliability and extended service life.</p>

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Influence of Corrosion Inhibitors on Coated Carbon Steel at Sweet Corrosion condition of CO2

  • 期刊论文

  • 发表日期：

    2025年5月2日

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  • Abeer Al-Farhan,
  • A. Akbar,
  • B. Al-Wakkaa,
  • R. Kadhmi,
  • L. Abraham

摘要

Corrosion has a significant economic and environmental impact on most oil sector facilities. One of the most widely used materials in these facilities is carbon steel. One major problem the oil sector faces is the corrosion and cracking of well motor housing of electrical submersible downhole pumps. These downhole pumps were used to inject water and thus raise production pressure. These pumps are mainly made of carbon steel and coated with epoxy as a corrosion-preventive method. Due to the high temperature and pressure, along with the presence of CO2 and injected water compositions, these pumps failed within a year of installation. This study explores the synergistic effects of zinc-rich epoxy coatings and eco-friendly corrosion inhibitors in mitigating sweet corrosion conditions. Advanced electrochemical techniques, including Linear Polarization Resistance, Electrochemical Impedance Spectroscopy (EIS), and Potentiodynamic Polarization, were employed to assess the efficacy of various combinations. The research identifies optimal inhibitor concentrations and coating strategies that enhance the corrosion resistance of carbon steel in high temperature, high-pressure environments. Results demonstrate that integrating a zinc-rich epoxy coating with 1000 ppm of water-soluble inhibitor B significantly reduces corrosion rates, offering a sustainable and cost-effective solution. The findings contribute valuable insights into developing environmental approaches for the protection of oilfield equipment, ensuring operational reliability and extended service life.