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<p>This paper examines and elaborates on how temperature and CO<sub>2</sub> influence the corrosion behavior of N80 in produced fluids. The results demonstrate that no protective corrosion products are formed at 50&#xa0;°C, leading to a higher corrosion rate. At 80&#xa0;°C, a dense protective layer of FeCO<sub>3</sub> was observed on the surface, resulting in a decreased corrosion rate. At 110&#xa0;°C, the main corrosion products are FeCO<sub>3</sub> and Fe<sub>3</sub>O<sub>4</sub>. Fe<sub>3</sub>O<sub>4</sub> is very thermodynamically stable, which protects the substrate better and causes the lowest corrosion rate. Additionally, under the temperature condition of 110&#xa0;°C, a high CO<sub>2</sub> pressure (0.8&#xa0;MPa) inhibits the formation of Fe<sub>3</sub>O<sub>4</sub> while promoting the faster generation of FeCO<sub>3</sub> on the surface. This creates a favorable environment for chloride ion enrichment, thereby intensifying localized corrosion.</p>

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Effects of Temperature and CO2 Pressure on the Corrosion Behavior of N80 Carbon Steel in Produced Fluids

  • 期刊论文

  • 发表日期：

    2025年3月26日

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  • Haoping Peng,
  • Jie Yang,
  • Linchun Yang,
  • Huan Li,
  • Zhetong Tang,
  • Xuping Su,
  • Zhiwei Li,
  • Mingguo Peng,
  • Changjun Wu,
  • Yonggang Zhao

摘要

This paper examines and elaborates on how temperature and CO2 influence the corrosion behavior of N80 in produced fluids. The results demonstrate that no protective corrosion products are formed at 50 °C, leading to a higher corrosion rate. At 80 °C, a dense protective layer of FeCO3 was observed on the surface, resulting in a decreased corrosion rate. At 110 °C, the main corrosion products are FeCO3 and Fe3O4. Fe3O4 is very thermodynamically stable, which protects the substrate better and causes the lowest corrosion rate. Additionally, under the temperature condition of 110 °C, a high CO2 pressure (0.8 MPa) inhibits the formation of Fe3O4 while promoting the faster generation of FeCO3 on the surface. This creates a favorable environment for chloride ion enrichment, thereby intensifying localized corrosion.