SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2025, Vol. 85 ›› Issue (9): 355-366.DOI: 10.1016/j.cjche.2025.02.036

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The effects of Cl- and Ca2+ on corrosion and scale formation of 3Cr steel in CO2 flooding produced fluid

Haifu Yuan1, Dezhi Zeng1, Jie Li2, Zhendong Liu1, Xi Wang1, Chengxiu Yu1, Yonggang Yi2, Baojun Dong1,3,4   

  1. 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. Engineering Technology Research Institute, PetroChina Xinjiang Oilfield Company, Karamay 834000, China;
    3. China University of Petroleum-Beijing at Karamay, Karamay 834000, China;
    4. Xinjiang Key Laboratory of Multi-medium Pipeline Safety Transportation, Urumqi 830000, China
  • 收稿日期:2024-10-21 修回日期:2024-12-26 接受日期:2025-02-19 出版日期:2025-09-28 发布日期:2025-05-15
  • 通讯作者: Dezhi Zeng,E-mail:zengdezhiswpu@163.com
  • 基金资助:
    The authors acknowledge the support from the National Natural Science Foundation of China (51774249) and the Sichuan Science and Technology Program (21JCQN0066).

The effects of Cl- and Ca2+ on corrosion and scale formation of 3Cr steel in CO2 flooding produced fluid

Haifu Yuan1, Dezhi Zeng1, Jie Li2, Zhendong Liu1, Xi Wang1, Chengxiu Yu1, Yonggang Yi2, Baojun Dong1,3,4   

  1. 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. Engineering Technology Research Institute, PetroChina Xinjiang Oilfield Company, Karamay 834000, China;
    3. China University of Petroleum-Beijing at Karamay, Karamay 834000, China;
    4. Xinjiang Key Laboratory of Multi-medium Pipeline Safety Transportation, Urumqi 830000, China
  • Received:2024-10-21 Revised:2024-12-26 Accepted:2025-02-19 Online:2025-09-28 Published:2025-05-15
  • Contact: Dezhi Zeng,E-mail:zengdezhiswpu@163.com
  • Supported by:
    The authors acknowledge the support from the National Natural Science Foundation of China (51774249) and the Sichuan Science and Technology Program (21JCQN0066).

摘要: To elucidate the effects of Cl- and Ca2+ on the corrosion and scale formation of 3Cr steel in CO2 flooding-produced fluid, corrosion weight loss experiments, and titration experiments were conducted. The resulting products were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). This study examined the corrosion and scaling behavior of 3Cr steel under the influence of Cl- and Ca2+. The results indicate that both Cl- and Ca2+ promote the corrosion of 3Cr steel. Notably, Cl- diminishes the promoting effect of Ca2+ on corrosion and inhibits scaling, revealing a mutual enhancement between corrosion and scaling. The mechanisms of localized corrosion under varying concentrations of Cl- and Ca2+ differ; under-scale corrosion occurs in environments with 5000 mg·L-1 Cl-, while Cl-induced corrosion is observed in 20000 mg·L-1 Cl- environments. This study highlights that under the synergistic effects of Cl-, Ca2+, and scaling processes, the protective product film dissolves, thereby influencing both corrosion and scaling processes.

关键词: 3Cr steel, Cl-, Ca2+, Corrosion and scaling, Synergistic effect

Abstract: To elucidate the effects of Cl- and Ca2+ on the corrosion and scale formation of 3Cr steel in CO2 flooding-produced fluid, corrosion weight loss experiments, and titration experiments were conducted. The resulting products were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). This study examined the corrosion and scaling behavior of 3Cr steel under the influence of Cl- and Ca2+. The results indicate that both Cl- and Ca2+ promote the corrosion of 3Cr steel. Notably, Cl- diminishes the promoting effect of Ca2+ on corrosion and inhibits scaling, revealing a mutual enhancement between corrosion and scaling. The mechanisms of localized corrosion under varying concentrations of Cl- and Ca2+ differ; under-scale corrosion occurs in environments with 5000 mg·L-1 Cl-, while Cl-induced corrosion is observed in 20000 mg·L-1 Cl- environments. This study highlights that under the synergistic effects of Cl-, Ca2+, and scaling processes, the protective product film dissolves, thereby influencing both corrosion and scaling processes.

Key words: 3Cr steel, Cl-, Ca2+, Corrosion and scaling, Synergistic effect