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An experimental investigation into the characteristics of hydraulic fracturing and fracture permeability after hydraulic fracturing in granite

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  • Zhang, Yanjun
  • Ma, Yueqiang
  • Hu, Zhongjun
  • Lei, Honglei
  • Bai, Lin
  • Lei, Zhihong
  • Zhang, Qian

Abstract

Geothermal energy, as a renewable energy source, can meet the growing need for energy associated with low atmospheric emissions. Hydraulic fracturing is a promising simulation technique used in enhanced geothermal systems to increase heat production from a geothermal reservoir by enhancing reservoir rock permeability. This paper presents an experimental study on hydraulic fracturing of granite which is the most suitable hot dry rock type focusing on the effects of confining stress, water injection flowrate, and temperature on breakdown pressure and fracture permeability. Results indicate that the rock temperature is one of the more important factors affecting hydraulic breakdown pressure. The breakdown pressure increases with the increase of confining pressure. Additionally, as the injection flow rate increases, the breakdown pressure increases. In addition, the fracture permeability after hydraulic fracturing is calculated on the basic of pressure data recorded during hydraulic fracturing. The results can provide some guidance to those seeking to implement economical and reasonable hydraulic fracturing simulations and improve heat production capacity in EGS.

Suggested Citation

  • Zhang, Yanjun & Ma, Yueqiang & Hu, Zhongjun & Lei, Honglei & Bai, Lin & Lei, Zhihong & Zhang, Qian, 2019. "An experimental investigation into the characteristics of hydraulic fracturing and fracture permeability after hydraulic fracturing in granite," Renewable Energy, Elsevier, vol. 140(C), pages 615-624.
    • Handle: RePEc:eee:renene:v:140:y:2019:i:c:p:615-624
    DOI: 10.1016/j.renene.2019.03.096
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    2. Wang, Yijiang & Jiang, Jinyi & Darkwa, Jo & Xu, Zeyuan & Zheng, Xiaofeng & Zhou, Guoqing, 2020. "Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity," Renewable Energy, Elsevier, vol. 160(C), pages 803-816.
    3. Yu, Likui & Wu, Xiaotian & Wang, Yadan & Ma, Weiwu & Liu, Gang, 2020. "Stratified rock hydraulic fracturing for enhanced geothermal system and fracture geometry evaluation via effective length," Renewable Energy, Elsevier, vol. 152(C), pages 713-723.
    4. Shan, Kun & Zhang, Yanjun & Zheng, Yanhao & Cheng, Yuxiang & Yang, Yunxing, 2021. "Effect of fault distribution on hydraulic fracturing: Insights from the laboratory," Renewable Energy, Elsevier, vol. 163(C), pages 1817-1830.
    5. Ion Pană & Iuliana Veronica Gheţiu & Ioana Gabriela Stan & Florinel Dinu & Gheorghe Brănoiu & Silvian Suditu, 2022. "The Use of Hydraulic Fracturing in Stimulation of the Oil and Gas Wells in Romania," Sustainability, MDPI, vol. 14(9), pages 1-33, May.

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