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Creep Rupture and Permeability Evolution in High Temperature Heat-Treated Sandstone Containing Pre-Existing Twin Flaws

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  • Sheng-Qi Yang

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Jin-Zhou Tang

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China
    Department of Energy and Mineral Engineering, EMS Energy Institute and G3 Center, Pennsylvania State University, State College, PA 16802, USA
    State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China)

  • Derek Elsworth

    (Department of Energy and Mineral Engineering, EMS Energy Institute and G3 Center, Pennsylvania State University, State College, PA 16802, USA)

Abstract

Utilizing underground coal gasification cavities for carbon capture and sequestration provides a potentially economic and sustainable solution to a vexing environmental and energy problem. The thermal influence on creep properties and long-term permeability evolution around the underground gasification chamber is a key issue in UCG-CCS operation in containing fugitive emissions. We complete multi-step loading and unloading creep tests with permeability measurement at confining stresses of 30 MPa on pre-cracked sandstone specimens thermally heat-treated to 250, 500, 750 and 1000 °C. Observations indicate a critical threshold temperature of 500 °C required to initiate thermally-induced cracks with subsequent strength reduction occurring at 750 °C. Comparison of histories of creep, visco-elastic and visco-plastic strains highlight the existence of a strain jump at a certain deviatoric stress level—where the intervening rock bridge between the twin starter-cracks is eliminated. As the deviatoric stress level increases, the visco-plastic strains make up an important composition of total creep strain, especially for specimens pre-treated at higher temperatures, and the development of the visco-plastic strain leads to the time-dependent failure of the rock. The thermal pre-treatment produces thermal cracks with their closure resulting in increased instantaneous elastic strains and instantaneous plastic strains. With increasing stress ratio, the steady-state creep rates increase slowly before the failure stress ratio but rise suddenly over the final stress ratio to failure. However, the pre-treatment temperature has no clear and apparent influence on steady creep strain rates. Rock specimens subject to higher pre-treatment temperatures exhibit higher permeabilities. The pre-existing cracks close under compression with a coplanar shear crack propagating from the starter-cracks and ultimately linking these formerly separate cracks. In addition, it is clear that the specimens pre-treated at higher temperatures accommodate greater damage.

Suggested Citation

  • Sheng-Qi Yang & Jin-Zhou Tang & Derek Elsworth, 2021. "Creep Rupture and Permeability Evolution in High Temperature Heat-Treated Sandstone Containing Pre-Existing Twin Flaws," Energies, MDPI, vol. 14(19), pages 1-19, October.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:19:p:6362-:d:650139
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    References listed on IDEAS

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    1. Christopher Otto & Thomas Kempka, 2015. "Thermo-Mechanical Simulations of Rock Behavior in Underground Coal Gasification Show Negligible Impact of Temperature-Dependent Parameters on Permeability Changes," Energies, MDPI, vol. 8(6), pages 1-28, June.
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    Cited by:

    1. Tingting Cai & Lei Shi & Yulong Jiang & Zengchao Feng, 2022. "A Core Damage Constitutive Model for the Time-Dependent Creep and Relaxation Behavior of Coal," Energies, MDPI, vol. 15(11), pages 1-16, June.
    2. Chun Zhu & Shengqi Yang & Yuanyuan Pu & Lijun Sun & Min Wang & Kun Du, 2023. "Advanced Progress of the Geo-Energy Technology in China," Energies, MDPI, vol. 16(19), pages 1-6, September.
    3. Xiaopeng Ren & Yajun Xin & Baoshan Jia & Kun Gao & Xuping Li & Yu Wang, 2022. "Large Stress-Gradient Creep Tests and Model Establishment for Red Sandstone Treated at High Temperatures," Energies, MDPI, vol. 15(20), pages 1-19, October.
    4. Jinzhou Tang & Shengqi Yang & Ke Yang & Wenling Tian & Guangjian Liu & Minke Duan, 2023. "Discrete Element Modeling of Thermally Damaged Sandstone Containing Two Pre-Existing Flaws at High Confining Pressure," Sustainability, MDPI, vol. 15(7), pages 1-17, April.
    5. Li, Wei & Li, Huaizhan & Chen, Yanpeng & Guo, Guangli & Chen, Fu & Tang, Chao & Zha, Jianfeng & Yuan, Yafei & Huo, Wenqi, 2024. "Risk analysis and production safety design of supercritical carbon dioxide storage in gasification combustion cavity," Energy, Elsevier, vol. 293(C).

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