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2023 Vol. 50, No. 6
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Article navigation > Geology in China > 2023 > 50(6): 1678-1690
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ZHAO Zhen, QIN Guangxiong, GENG Songhe, CHEN Huijuan, CHAO Jiahao, ZHANG Liang. 2023. Corrosion performance of steel in geothermal water environment in Xining area and suggestions for anti-corrosion measures[J]. Geology in China, 50(6): 1678-1690. doi: 10.12029/gc20210503001
Citation: ZHAO Zhen, QIN Guangxiong, GENG Songhe, CHEN Huijuan, CHAO Jiahao, ZHANG Liang. 2023. Corrosion performance of steel in geothermal water environment in Xining area and suggestions for anti-corrosion measures[J]. Geology in China, 50(6): 1678-1690. doi: 10.12029/gc20210503001
shu

Corrosion performance of steel in geothermal water environment in Xining area and suggestions for anti-corrosion measures

  • 1.

    School of Engineering, China University of Geosciences, Wuhan 430074, Hubei, China

  • 2.

    Qinghai Bureau of Environmental Geological Exploration, Xining 810001, Qinghai, China

  • 3.

    Qinghai Provincial Key Laboratory of Environmental Geology, Xining 810001, Qinghai, China

  • 4.

    Qinghai 906 Engineering Survey and Design Institute Co., Ltd., Xining 810001, Qinghai, China

  • 5.

    School of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266580, Shandong, China

  • 6.

    Key Laboratory of Unconventional Oil & Gas Development, Ministry of Education, China University of Petroleum(East China), Qingdao 266580, Shandong, China

    • Fund Project: Supported by Qinghai Applied Basic Research Project (No.2020-ZJ-758)
More Information
  • Author Bio: ZHAO Zhen, male, born in 1982, senior engineer, mainly engaged in hydrogeology, environmental geothermal, geothermal geological survey and evaluation work; E-mail: zhaozhen906@126.com
  • Corresponding author: QIN Guangxiong, male, born in 1986, engineer, mainly engaged in hydrogeological and geothermal geological survey and evaluation; E-mail: 936096547@qq.com 
Received Date:  03 May 2021
Revised Date:  31 May 2021
Publish Date:  25 December 2023
    Abstract

  • This paper is the result of geothermal survey engineering.

     Objective

    Xining area is rich in medium and low temperature geothermal resources, but the high salinity and strong corrosion of geothermal water limit the efficient development of geothermal energy. The proposed safe, economic and effective comprehensive well bucket anticorrosion measures are the basis and key to the effective utilization of high salinity geothermal resources.

     Methods

    In this study, the typical geothermal water in Xining area was collected, and the ionic composition and content of corrosive bacteria were tested. The high-temperature and high-pressure reactor was used to carry out metal plate corrosion tests to evaluate the corrosion performance of geothermal water on different steels under typical wellbore conditions. The corrosion type and the relationship between the corrosion rate and the influencing factors was analyzed. Finally, the anti-corrosion measures for geothermal water reinjection were proposed.

     Results

    The main corrosion components in geothermal water are Cl-, SO42-, H+ and dissolved oxygen, which cause uniform corrosion, platform corrosion and a small amount of pitting corrosion. The main corrosion products are FeO(OH) and Fe3O4; the corrosion rate along the wellbore gradually increases, and the corrosion risk at bottom hole is the greatest. In addition, the corrosion rate has a greater correlation with the geothermal water properties, P-T condition, flow speed and dissolved oxygen mixed into wellbore.

     Conclusions

    By fitting carbon steel corrosion experiment data, an empirical equation is established. The predicted value obtained by using the empirical equation is in good agreement with the experimental value. Safe, cost-effective and comprehensive wellbore anti-corrosion measures can be taken from the perspective of anti-corrosion pipes, reinjection geothermal water pretreatment, reinjection process parameters.
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