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The experimental investigation of effect of supercritical CO2 immersion on mechanical properties and pore structure of shale

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  • Bai, Bing
  • Ni, Hong-jian
  • Shi, Xian
  • Guo, Xing
  • Ding, Lu

Abstract

The interactions between supercritical carbon dioxide (ScCO2) and shale significantly affect shale reservoir exploitation. This study investigates the effect of ScCO2 immersion on the mechanical behavior and microstructure of shale with inclined layering. The orientations α of the bedding plane with respect to the horizontal direction are 0°, 30°, 45°, 60°, and 90°. Mechanical experiment results indicated that the compressive strength of shale decreased, while the elastic moduli increased in ScCO2 immersion. The compressive strength exhibited the same variation tendency, while the elastic modulus exhibited the opposite change trend with increasing α before and in ScCO2 immersion. ScCO2 alters the mechanical properties of shale through pressure, adsorption, and dissolution; the dominant factor enhancing the elastic modulus is adsorption. X-ray diffraction and low-pressure nitrogen adsorption experiments showed that the influence of ScCO2 on the microstructure of the layering was more significant than the influence on the matrix; ScCO2 mainly broadened the micropores in the matrix, while transforming the mesopores and macropores in the bedding plane. This study provides the theoretical basis for the development of shale reservoirs using ScCO2.

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  • Bai, Bing & Ni, Hong-jian & Shi, Xian & Guo, Xing & Ding, Lu, 2021. "The experimental investigation of effect of supercritical CO2 immersion on mechanical properties and pore structure of shale," Energy, Elsevier, vol. 228(C).
    • Handle: RePEc:eee:energy:v:228:y:2021:i:c:s0360544221009129
    DOI: 10.1016/j.energy.2021.120663
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    References listed on IDEAS

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    1. Lyu, Qiao & Long, Xinping & Ranjith, P.G. & Tan, Jingqiang & Kang, Yong & Wang, Zhanghu, 2018. "Experimental investigation on the mechanical properties of a low-clay shale with different adsorption times in sub-/super-critical CO2," Energy, Elsevier, vol. 147(C), pages 1288-1298.
    2. Feng, Gan & Kang, Yong & Sun, Ze-dong & Wang, Xiao-chuan & Hu, Yao-qing, 2019. "Effects of supercritical CO2 adsorption on the mechanical characteristics and failure mechanisms of shale," Energy, Elsevier, vol. 173(C), pages 870-882.
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    Cited by:

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    3. Tian, Shifeng & Zhou, Junping & Xian, Xuefu & Gan, Quan & Zhang, Chengpeng & Dong, Zhiqiang & Kuang, Nianjie, 2023. "The impact of supercritical CO2 exposure time on the effective stress law for permeability in shale," Energy, Elsevier, vol. 284(C).
    4. Tian, Shifeng & Zhou, Junping & Xian, Xuefu & Gan, Quan & Yang, Kang & Zheng, Yi & Deng, Guangrong & Zhang, Fengshou, 2023. "Impact of supercritical CO2 exposure time on the porosity and permeability of dry and wet shale: The influence of chemo-mechanical coupling effects," Energy, Elsevier, vol. 270(C).
    5. He, Qianyang & Li, Delu & Sun, Qiang & Wei, Baowei & Wang, Shaofei, 2022. "Main controlling factors of marine shale compressive strength: A case study on the cambrian Niutitang Formation in Dabashan Mountain," Energy, Elsevier, vol. 260(C).

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