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Experimental Study on Reservoir Physical Properties and Formation Blockage Risk in Geothermal Water Reinjection in Xining Basin: Taking Well DR2018 as an Example

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  • Zhen Zhao

    (Qinghai Bureau of Environmental Geology Exploration, Xining 810001, China
    Key Laboratory of Environmental Geology of Qinghai Province, Xining 810001, China
    Qinghai 906 Engineering Survey and Design Institute, Xining 810001, China)

  • Guangxiong Qin

    (Qinghai Bureau of Environmental Geology Exploration, Xining 810001, China
    Key Laboratory of Environmental Geology of Qinghai Province, Xining 810001, China
    Qinghai 906 Engineering Survey and Design Institute, Xining 810001, China)

  • Yinfei Luo

    (Qinghai Bureau of Environmental Geology Exploration, Xining 810001, China
    Key Laboratory of Environmental Geology of Qinghai Province, Xining 810001, China
    Qinghai 906 Engineering Survey and Design Institute, Xining 810001, China)

  • Songhe Geng

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

  • Linchao Yang

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

  • Ronghua Wen

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

  • Jiahao Chao

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

  • Liang Zhang

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

Abstract

The Xining Basin in Qinghai Province, China, is rich in mid–low temperature geothermal resources, but the reinjection of geothermal water has not yet started. In this paper, the physical properties of rocks sampled from the newly drilled geothermal well DR2018 were analyzed, and a series of core flooding experiments was conducted to assess the formation blockage risk during water reinjection. The experimental results show that the geothermal reservoir has a low porosity of 1.64–18.68% and a low permeability of 0.04–7.23 md. The rocks are weakly consolidated, and the movable clay and sand particles account for 0.18–23.42 wt %, which results in a significant rate and salinity sensitivity. Even at low water flow velocity of 0.31–1.64 cm/min, the core permeability will drop by 35–53% after 25-144PV injection. An obvious fluctuation and decline in core permeability can also be observed as the injected water salinity decreases. The blockage risk induced by the invasion of low-content scaling and suspended particles in injected water can be covered up by the migration of movable particles in cores. The particle migration and blockage in the near-wellbore formation will be the main reason to cause the decline in the well’s geothermal reinjection capacity.

Suggested Citation

  • Zhen Zhao & Guangxiong Qin & Yinfei Luo & Songhe Geng & Linchao Yang & Ronghua Wen & Jiahao Chao & Liang Zhang, 2021. "Experimental Study on Reservoir Physical Properties and Formation Blockage Risk in Geothermal Water Reinjection in Xining Basin: Taking Well DR2018 as an Example," Energies, MDPI, vol. 14(9), pages 1-19, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:9:p:2671-:d:549732
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    References listed on IDEAS

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    1. Zhang, Liang & Chao, Jiahao & Geng, Songhe & Zhao, Zhen & Chen, Huijuan & Luo, Yinfei & Qin, Guangxiong, 2020. "Particle migration and blockage in geothermal reservoirs during water reinjection: Laboratory experiment and reaction kinetic model," Energy, Elsevier, vol. 206(C).
    2. Pouriya H. Niknam & Lorenzo Talluri & Daniele Fiaschi & Giampaolo Manfrida, 2020. "Improved Solubility Model for Pure Gas and Binary Mixture of CO 2 -H 2 S in Water: A Geothermal Case Study with Total Reinjection," Energies, MDPI, vol. 13(11), pages 1-14, June.
    3. Yu, Lu & Zhang, Liang & Zhang, Rui & Ren, Shaoran, 2018. "Assessment of natural gas production from hydrate-bearing sediments with unconsolidated argillaceous siltstones via a controlled sandout method," Energy, Elsevier, vol. 160(C), pages 654-667.
    4. Niknam, Pouriya H. & Talluri, Lorenzo & Fiaschi, Daniele & Manfrida, Giampaolo, 2021. "Sensitivity analysis and dynamic modelling of the reinjection process in a binary cycle geothermal power plant of Larderello area," Energy, Elsevier, vol. 214(C).
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