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Mechanical and Acoustic Response of Low-Permeability Sandstone under Multilevel Cyclic Loading-Unloading Stress Paths

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  • Hongying Tan

    (State Key Laboratory of Coal Mine Disaster and Control, Chongqing University, Chongqing 400044, China
    State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China)

  • Hejuan Liu

    (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

  • Xilin Shi

    (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

  • Hongling Ma

    (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

  • Xiaosong Qiu

    (Key Laboratory of Underground Storage of Oil and Gas Engineer of China National Petroleum Corporation, Langfang 065007, China)

  • Yintong Guo

    (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

  • Shengnan Ban

    (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

Abstract

Low-permeability sandstone reservoirs have been widely used as a gas storage medium worldwide. Compared with the high porosity and high permeability of sandstone, low-permeability sandstone may present different mechanical (deformation, damage or failure) and acoustic responses under cyclic loading-unloading processes caused by the high-rate injection–production of underground gas storage. In this paper, multistage triaxial loading–unloading tests with a continuously increased upper limit of stress were carried out on low-permeability sandstone under six different confining pressures. The results showed that the superposition of stress–strain curves become much denser in the process of each level of stress. Based on the variation of the elastic modulus of low-permeability sandstone under alternating loads, the mechanical behavior of low-permeability sandstone under cyclic loading is divided into three stages: cyclic hardening, stability and cyclic softening. According to the evolution of acoustic emission (AE) signal parameters, AE counts appear intensively at the initial stage of each level of stress and then gradually stabilize. The peak frequency presents the zonal distribution, which is divided into low-frequency, intermediate-frequency and high-frequency zones. Low confining pressure leads to a small b-value. The RA–AF distribution implies that the mixed tensile–shear cracks are continuously generated in low-permeability sandstone during the cyclic loading process, and the shear cracks are more obviously developed.

Suggested Citation

  • Hongying Tan & Hejuan Liu & Xilin Shi & Hongling Ma & Xiaosong Qiu & Yintong Guo & Shengnan Ban, 2023. "Mechanical and Acoustic Response of Low-Permeability Sandstone under Multilevel Cyclic Loading-Unloading Stress Paths," Energies, MDPI, vol. 16(19), pages 1-18, September.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:19:p:6821-:d:1248109
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    References listed on IDEAS

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    1. Mahmoodpour, Saeed & Singh, Mrityunjay & Bär, Kristian & Sass, Ingo, 2022. "Thermo-hydro-mechanical modeling of an enhanced geothermal system in a fractured reservoir using carbon dioxide as heat transmission fluid- A sensitivity investigation," Energy, Elsevier, vol. 254(PB).
    2. Song, Rui & Wang, Yao & Tang, Yu & Jiajun peng, & Liu, Jianjun & Yang, Chunhe, 2022. "3D Printing of natural sandstone at pore scale and comparative analysis on micro-structure and single/two-phase flow properties," Energy, Elsevier, vol. 261(PA).
    3. Xiaosong Qiu & Hejuan Liu & Mancang Liu & Haijun Mao & Duocai Wang & Qiqi Ying & Shengnan Ban, 2023. "Pore Structure Evolution in Sandstone of Underground Gas Storage during Cyclic Injection and Production Based on Nuclear Magnetic Resonance Technology," Energies, MDPI, vol. 16(5), pages 1-17, February.
    4. Mahmoodpour, Saeed & Singh, Mrityunjay & Turan, Aysegul & Bär, Kristian & Sass, Ingo, 2022. "Simulations and global sensitivity analysis of the thermo-hydraulic-mechanical processes in a fractured geothermal reservoir," Energy, Elsevier, vol. 247(C).
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