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Experimental investigation of the tensile behavior and acoustic emission characteristics of anisotropic shale under geothermal environment

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  • Guo, Yide
  • Huang, Linqi
  • Li, Xibing

Abstract

Shale gas is becoming a top priority for future global energy consumption and climate change mitigation, and deep and ultradeep shale gas extraction cannot overlook the influence of the geothermal environment. This paper experimentally investigated the tensile behavior and acoustic emission (AE) characteristics of anisotropic shale under geothermal environment of 25–200 °C. The results indicate that the tensile strength and absorbed energy of all specimens decreased with increasing temperature, and minimum values occurred in specimens with a layer inclination of 90° at each temperature. The evolution of tensile strength and absorbed energy versus the layer inclination did not vary with increasing temperature, exhibiting an inverted-V shape. Anisotropic failure mode of specimens with layer inclinations of 30°, 45° and 60° was influenced by the increasing temperature, but central tensile fracturing in specimens with layer inclinations of 0° and 90° was temperature-independent. With increasing temperature, the cumulative AE hits of specimens showed a highly obvious step-up trend, and anisotropic crack initiation stress levels obtained via the AE definition significantly varied. Finally, microstructure response, fracture length and fracture location and proportion of fracture types were discussed, and potential applications and challenges of geothermal environment in hydraulic fracturing of deep shale reservoirs were proposed.

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  • Guo, Yide & Huang, Linqi & Li, Xibing, 2023. "Experimental investigation of the tensile behavior and acoustic emission characteristics of anisotropic shale under geothermal environment," Energy, Elsevier, vol. 263(PD).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pd:s0360544222026536
    DOI: 10.1016/j.energy.2022.125767
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    Cited by:

    1. Wan, Xuesong & Zhang, Weiwei & Deng, Ke & Luo, Maokang, 2024. "Shale gas completion fracturing technology based on FAE controlled burning explosion," Energy, Elsevier, vol. 296(C).
    2. Guo, Yide & Huang, Linqi & Li, Xibing, 2023. "Experimental and numerical investigation on the fracture behavior of deep anisotropic shale reservoir under in-situ temperature," Energy, Elsevier, vol. 282(C).
    3. Guo, Yide & Dyskin, Arcady & Pasternak, Elena, 2024. "Thermal spallation of dry rocks induced by flame parallel or normal to layering: Effect of anisotropy," Energy, Elsevier, vol. 288(C).
    4. Guo, Yide & Li, Xibing & Huang, Linqi, 2023. "Experimental investigation on the sudden cooling effect of oil-based drilling fluid on the dynamic compressive behavior of deep shale reservoirs," Energy, Elsevier, vol. 282(C).

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