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<p>In the oil and gas extraction environment, the high CO<sub>2</sub> content and high salinity formation water will lead to simultaneous corrosion and scaling problems in the wellbore. The usage of corrosion and scale inhibitors is one of the effective methods to suppress the corrosion and scaling of pipelines in oil and gas fields. In this work, an imidazoline derivative (OA-IM-TU-HEDP) was synthesized as high-efficiency integrated corrosion and scale inhibitor for carbon steel in CO<sub>2</sub>-containing formation water. The experimental tests show that OA-IM-TU-HEDP has outstanding corrosion and scale inhibition effects, with the corrosion inhibition efficiency more than 97% in supercritical CO<sub>2</sub> environment at 120&#xa0;°C and scale inhibition efficiency more than 90%. Quantum chemical calculations show that the introduction of thiourea and phosphonic acid groups into imidazoline corrosion inhibitor can significantly increase the adsorption sites and then effectively improve the adsorption performance of OA-IM-TU-HEDP. Molecular dynamics (MD) simulations indicate that OA-IM-TU-HEDP molecules could adsorb on the steel surface with the imidazoline ring, thiourea fragment, and phosphonic acid group, which can effectively prevent corrosive species from reaching the steel surface, thereby suppressing steel corrosion. In addition, OA-IM-TU-HEDP molecules can adsorb on CaCO<sub>3</sub> surface through phosphonic acid group to prevent the further growth and accumulation of CaCO<sub>3</sub> scale, thereby effectively inhibiting the formation of CaCO<sub>3</sub> scale.</p>

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High-Efficiency Integrated Corrosion and Scale Inhibitor for Carbon Steel in CO2-Containing Formation Water: Experimental and Theoretical Studies

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Zhengrong Ye,
  • Haiwei Lu,
  • Xiang Zhou,
  • Tong Peng,
  • Xiang Liu,
  • Xiaodong Cui,
  • Ran Yi,
  • Guoan Zhang

摘要

In the oil and gas extraction environment, the high CO2 content and high salinity formation water will lead to simultaneous corrosion and scaling problems in the wellbore. The usage of corrosion and scale inhibitors is one of the effective methods to suppress the corrosion and scaling of pipelines in oil and gas fields. In this work, an imidazoline derivative (OA-IM-TU-HEDP) was synthesized as high-efficiency integrated corrosion and scale inhibitor for carbon steel in CO2-containing formation water. The experimental tests show that OA-IM-TU-HEDP has outstanding corrosion and scale inhibition effects, with the corrosion inhibition efficiency more than 97% in supercritical CO2 environment at 120 °C and scale inhibition efficiency more than 90%. Quantum chemical calculations show that the introduction of thiourea and phosphonic acid groups into imidazoline corrosion inhibitor can significantly increase the adsorption sites and then effectively improve the adsorption performance of OA-IM-TU-HEDP. Molecular dynamics (MD) simulations indicate that OA-IM-TU-HEDP molecules could adsorb on the steel surface with the imidazoline ring, thiourea fragment, and phosphonic acid group, which can effectively prevent corrosive species from reaching the steel surface, thereby suppressing steel corrosion. In addition, OA-IM-TU-HEDP molecules can adsorb on CaCO3 surface through phosphonic acid group to prevent the further growth and accumulation of CaCO3 scale, thereby effectively inhibiting the formation of CaCO3 scale.