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Study on the cracking mechanism of hydraulic and supercritical CO2 fracturing in hot dry rock under thermal stress

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  • Zhang, Wei
  • Wang, Chunguang
  • Guo, Tiankui
  • He, Jiayuan
  • Zhang, Le
  • Chen, Shaojie
  • Qu, Zhanqing

Abstract

To realize the effective extraction of high-temperature thermal energy in enhanced geothermal system (EGS), it is necessary to explore how to efficiently construct fracture network in hot dry rock (HDR). Considering the cryogenic induced thermal stress, we investigate the cracking mechanism when using supercritical CO2 (SCCO2) and hydraulic fracturing to stimulate HDR. Firstly, the established three-dimensional THMD coupling model is verified by conducting high temperature granite fracturing experiments. Then, characteristics of the heat and mass transfer and fracture propagation when using SCCO2 and H2O in HDR fracturing are explored. Finally, the cracking mechanism of hydraulic and SCCO2 fracturing in HDR under thermal stress is revealed. The results indicate that the cryogenic induced thermal stress can reduce the cracking pressure and tend to form branch fractures under the cooperation of injection pressure. Adopting SCCO2 in HDR fracturing more micro fractures can be generated in near-well zone. Hydraulic fracturing has better cooling efficiency and preferably capability of extending fractures. For HDR fracturing, the scope of fracture network tends to increase first and then decrease with the raise of injection mass flux. The lower viscosity and higher specific heat capacity of fracturing fluid can promote the formation of fracture network.

Suggested Citation

  • Zhang, Wei & Wang, Chunguang & Guo, Tiankui & He, Jiayuan & Zhang, Le & Chen, Shaojie & Qu, Zhanqing, 2021. "Study on the cracking mechanism of hydraulic and supercritical CO2 fracturing in hot dry rock under thermal stress," Energy, Elsevier, vol. 221(C).
    • Handle: RePEc:eee:energy:v:221:y:2021:i:c:s0360544221001353
    DOI: 10.1016/j.energy.2021.119886
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    4. Xu, Fuqiang & Shi, Yu & Song, Xianzhi & Wu, Wei & Song, Guofeng & Li, Shuang, 2024. "Experimental characterization of damage during geothermal production of hot dry rocks: Comprehensive effects of the damage-elastic deformation on conductivity evolution," Energy, Elsevier, vol. 294(C).
    5. Li, Yuwei & Peng, Genbo & Tang, Jizhou & Zhang, Jun & Zhao, Wanchun & Liu, Bo & Pan, Yishan, 2023. "Thermo-hydro-mechanical coupling simulation for fracture propagation in CO2 fracturing based on phase-field model," Energy, Elsevier, vol. 284(C).
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    8. Zhang, Jiansong & Liu, Yongsheng & Lv, Jianguo & Gao, Wenlong, 2024. "The flow and heat transfer characteristics of supercritical mixed-phase CO2 and N2 in a 3D self-affine rough fracture," Energy, Elsevier, vol. 303(C).
    9. Qiao, Mingzheng & Jing, Zefeng & Feng, Chenchen & Li, Minghui & Chen, Cheng & Zou, Xupeng & Zhou, Yujuan, 2024. "Review on heat extraction systems of hot dry rock: Classifications, benefits, limitations, research status and future prospects," Renewable and Sustainable Energy Reviews, Elsevier, vol. 196(C).
    10. Aliyu, Musa D. & Finkbeiner, Thomas & Chen, Hua-Peng & Archer, Rosalind A., 2023. "A three-dimensional investigation of the thermoelastic effect in an enhanced geothermal system reservoir," Energy, Elsevier, vol. 262(PA).
    11. Qin, Lei & Lin, Siheng & Lin, Haifei & Xue, Zitong & Wang, Weikai & Zhang, Xian & Li, Shugang, 2023. "Distribution of unfrozen water and heat transfer mechanism during thawing of liquid nitrogen immersed coal," Energy, Elsevier, vol. 263(PC).
    12. Wang, Song & Zhou, Jian & Zhang, Luqing & Han, Zhenhua & Kong, Yanlong, 2024. "Numerical insight into hydraulic fracture propagation in hot dry rock with complex natural fracture networks via fluid-solid coupling grain-based modeling," Energy, Elsevier, vol. 295(C).

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