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Experimental study of the effects of sub- and super-critical CO2 saturation on the mechanical characteristics of organic-rich shales

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  • Yin, Hong
  • Zhou, Junping
  • Xian, Xuefu
  • Jiang, Yongdong
  • Lu, Zhaohui
  • Tan, Jingqiang
  • Liu, Guojun

Abstract

The interaction between carbon dioxide (CO2) and shale during the process of CO2 sequestration and shale gas recovery could significantly affect mechanical properties of the shale. In the current study, we performed experiments at 38 °C on shale samples from the Sichuan Basin aiming at investigating the effects of sub-critical CO2 (SubCO2) and super-critical CO2 (ScCO2) saturation on shale mechanics. Uniaxial compressive strength (UCS) test, X-ray diffraction (XRD) analysis, energy dispersive X-ray spectroscopy (EDX) analysis and acoustic emission (AE) analysis were conducted on the raw and CO2-saturated (4, 6, 8, 12 and 16 MPa) shale samples. Results indicate that SubCO2 saturation (4 and 6 MPa) causes reduction in UCS and elastic modulus (E) of the shale up to 22.9% and 23.1%, respectively. More significantly, ScCO2 saturation (8, 12 and 16 MPa) causes up to 33.9% reductions of UCS and 34.0% reduction of E. This phenomenon can be attributed to a higher adsorptive potential and dissolution capacity of the ScCO2 fluid. In addition, these two parameters gradually vary with increasing saturation pressure: They slowly decrease and reach minimum values at 12 MPa, and then slightly increase as the saturation pressure increases from 12 to 16 MPa because of the compression effect resulted from higher fluid pressure. Results of AE analysis show that, compared with the raw shale samples, cracks of the CO2-saturated samples have a longer closure stage while a shorter stable and unstable crack propagation stage. It reveals that mechanical weakening of the shale is controlled by microscopic damages that resulted from CO2 saturation. Overall, our study confirms that the influence of CO2 saturation on the mechanical characteristics of organic-rich shale samples is closely related to gas pressure and phase state of CO2.

Suggested Citation

  • Yin, Hong & Zhou, Junping & Xian, Xuefu & Jiang, Yongdong & Lu, Zhaohui & Tan, Jingqiang & Liu, Guojun, 2017. "Experimental study of the effects of sub- and super-critical CO2 saturation on the mechanical characteristics of organic-rich shales," Energy, Elsevier, vol. 132(C), pages 84-95.
    • Handle: RePEc:eee:energy:v:132:y:2017:i:c:p:84-95
    DOI: 10.1016/j.energy.2017.05.064
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    17. Yugang Cheng & Mengru Zeng & Zhaohui Lu & Xidong Du & Hong Yin & Liu Yang, 2020. "Effects of Supercritical CO 2 Treatment Temperatures on Mineral Composition, Pore Structure and Functional Groups of Shale: Implications for CO 2 Sequestration," Sustainability, MDPI, vol. 12(9), pages 1-22, May.
    18. 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.
    19. 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).
    20. 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).
    21. Lu, Yiyu & Chen, Xiayu & Tang, Jiren & Li, Honglian & Zhou, Lei & Han, Shuaibin & Ge, Zhaolong & Xia, Binwei & Shen, Huajian & Zhang, Jing, 2019. "Relationship between pore structure and mechanical properties of shale on supercritical carbon dioxide saturation," Energy, Elsevier, vol. 172(C), pages 270-285.
    22. Stian Rørheim & Mohammad Hossain Bhuiyan & Andreas Bauer & Pierre Rolf Cerasi, 2021. "On the Effect of CO 2 on Seismic and Ultrasonic Properties: A Novel Shale Experiment," Energies, MDPI, vol. 14(16), pages 1-20, August.
    23. Qin, Chao & Jiang, Yongdong & Luo, Yahuang & Zhou, Junping & Liu, Hao & Song, Xiao & Li, Dong & Zhou, Feng & Xie, Yingliang, 2020. "Effect of supercritical CO2 saturation pressures and temperatures on the methane adsorption behaviours of Longmaxi shale," Energy, Elsevier, vol. 206(C).

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