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With the development of oil and gas resources, the formation water with high concentrations of Ca2+ and Cl− has put forward higher requirements for the safe service of tubular columns. In this study paper, the underground environment is simulated using high-temperature and high-pressure autoclave; electrochemical research results are combined, and the effects of Ca2+ concentration, corrosion temperature, and corrosion time on the corrosion behavior of P110 steel in CO2- saturation solution are analyzed. Research results show that the presence of Ca2+ promotes the acidification of the solution and accelerate the dissolution of the P110 steel. The trend of corrosion rate and Ca2+ concentration in high-Cl− solution is a “V” curve. The highest corrosion rate of 2.2 mm/a occurs in 1080 mg/L Ca2+ CO2-saturated NaCl solution. As the temperature increases, the corrosion rate of P110 steel decreases. The corrosion rate is approximately at a constant value above 120 °C. In addition, higher Ca2+concentration in the solution increases the probability of pitting for P110 steel. For FexCa1-xCO3 compounds, no strict ratio is observed between Fe and Ca, and the shape of the product depends on the concentration of Ca2+ ions in the solution.

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Corrosion Behavior of P110 Steel in CO2-Saturation Solution with High Concentration of Cl− and Ca2+ Under High Temperature and Pressure

  • 会议论文

  • 发表日期：

    2026年

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  • Ya-ni Zhang,
  • Jin-heng Luo,
  • Yan Long,
  • Bing-Fan

摘要

With the development of oil and gas resources, the formation water with high concentrations of Ca2+ and Cl− has put forward higher requirements for the safe service of tubular columns. In this study paper, the underground environment is simulated using high-temperature and high-pressure autoclave; electrochemical research results are combined, and the effects of Ca2+ concentration, corrosion temperature, and corrosion time on the corrosion behavior of P110 steel in CO2- saturation solution are analyzed. Research results show that the presence of Ca2+ promotes the acidification of the solution and accelerate the dissolution of the P110 steel. The trend of corrosion rate and Ca2+ concentration in high-Cl− solution is a “V” curve. The highest corrosion rate of 2.2 mm/a occurs in 1080 mg/L Ca2+ CO2-saturated NaCl solution. As the temperature increases, the corrosion rate of P110 steel decreases. The corrosion rate is approximately at a constant value above 120 °C. In addition, higher Ca2+concentration in the solution increases the probability of pitting for P110 steel. For FexCa1-xCO3 compounds, no strict ratio is observed between Fe and Ca, and the shape of the product depends on the concentration of Ca2+ ions in the solution.