Abstract
During the production of shale oil and gas, the interaction between carbon dioxide and shale will have a significant impact on the rock properties. Using brazilian splitting experiments and uniaxial compression experiments, the mechanical properties of shale samples subjected to supercritical carbon dioxide (SC-CO2) at different temperatures were investigated in this study. The results of this study indicate that the tensile and compressive strengths of shale decrease gradually after exposure to SC-CO2, and the higher the temperature at which SC-CO2 acts, the greater the decline in strength. The mode of shale failure has shifted from a single tension failure to a mixed tension shear failure. Shale samples have a critical damage threshold temperature of 350 ℃, and the SC-CO2 effect significantly reduces shale strength. This is related to the alteration of the rock internal structure during the high temperature shale formation process, and it is also the underlying cause of the deterioration of the shale mechanical properties. The failure mechanism and fracture mode of the rock are largely determined by its mechanical properties. The study findings have significant theoretical value and a number of practical applications in the area of shale oil and gas reservoir engineering.
Copyright 2023, IFEDC Organizing Committee.
This paper was prepared for presentation at the 2023 International Field Exploration and Development Conference in Wuhan, China, 20-22 September 2023.
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References
Zhou, J.P., Yang, K., Zhou, L., et al.: Microstructure and mechanical properties alterations in shale treated via CO2/CO2-water exposure. J. Petrol. Sci. Eng. 196 (2021)
Wang, L., Yang, D., Kang, Z.Q., et al. Experimental study on the effects of steam temperature on the pore-fracture evolution of oil shale exposed to the convection heating. J. Anal. Appl. Pyrolysis, 164 (2022)
Zhao, J., Yang, L.S., Yang, D., et al.: Study on pore and fracture evolution characteristics of oil shale pyrolysed by high-temperature water vapour. Oil Shale 39(1), 79–95 (2022)
Yang, S.Q., Yang, D., Kang, Z.Q.: Experimental investigation of the anisotropic evolution of tensile strength of oil shale under real-time high-temperature conditions. Nat. Resour. Res. 30(3), 2513–2528 (2021)
Lyu, Q., Long, X.P., Ranjith, P.G., et al.: Experimental investigation on the mechanical properties of a low-clay shale with different adsorption times in sub-/super-critical CO2. Energy 147, 1288–1298 (2018)
Yin, H., Zhou, J.P., Xian, X.F., et al.: Experimental study of the effects of sub- and super-critical CO2 saturation on the mechanical characteristics of organic-rich shales. Energy 132, 84–95 (2017)
Wang, G.Y., Yang, D., Kang, Z.Q., et al.: Numerical investigation of the in situ oil shale pyrolysis process by superheated steam considering the anisotropy of the thermal, hydraulic, and mechanical characteristics of oil shale. Energy Fuels 33(12), 12236–12250 (2019)
Wu, J.W., Feng, Z.J., Chen, S.P., et al.: Destruction law of borehole surrounding rock of granite under thermo-hydro-mechanical coupling. Geofluids (2020)
Guo, Y.D., Huang, L.Q., Li, X.B., et al.: Experimental investigation on the effects of thermal treatment on the physical and mechanical properties of shale. J. Nat. Gas Sci. Eng. 82, 103496 (2020)
Sun Z.D., Song X.M., Feng G., et al. Experimental study on the fracture behavior of sandstone after SCCO2-water-rock interaction. J. Nat. Gas Sci. Eng. 68 (2019)
Zhou, J.P., Tian, S.F., Zhou, L., et al.: Effect of sub-/super-critical CO2 and brine exposure on the mechanical and acoustic emission characteristics of shale. J. Nat. Gas Sci. Eng. 90, 103921 (2021)
Li, H.L., Zhou, L., Lu, Y.Y., et al.: Changes in pore structure of dry-hot rock with supercritical CO2 treatment. Energy Fuels 34(5), 6059–6068 (2020)
Acknowledgments
This research was supported by the National Natural Science Foundation of China (Grant No. 51974341 and U22B6004), the Innovation Fund Project for Graduate Student of China University of Petroleum (East China) (No. 22CX04048A), and the Fundamental Research Funds for the Central Universities (No. 20CX06070A and No. 22CX04048A). We also appreciate the reviewers and editors for their constructive comments to make the paper high quality.
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Ge, J., Yao, Cj., Hu, Jw., Zhang, Q., Du, Xg. (2024). Influence of Supercritical Carbon Dioxide at Various Temperatures on Shale Mechanical Properties. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2023. IFEDC 2023. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-97-0264-0_119
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DOI: https://doi.org/10.1007/978-981-97-0264-0_119
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