Abstract
With the development of in-situ shale oil recovery technology at low and medium maturity, it is particularly important to elucidate the change of shale properties and damage mechanism under the effect of high-temperature thermal fluid. The evolution of physical and mechanical properties of shale under the effect of high temperature thermal fluid was studied by nuclear magnetic resonance experiment, gas permeability experiment, triaxial compression experiment and Brazilian splitting experiment. The results show that with the increase of thermal fluid temperature, the T2 curve amplitude is higher, the gas permeability increases significantly, the tensile strength increases, the compressive strength gradually decreases, and the rock cracks appear under the effect of 350 ℃ thermal fluid. In addition, confining pressure was applied reasonably during rock heating in order to simulate in-situ underground conditions. The above research has practical significance to elucidate the mechanism of fracture propagation under the effect of high temperature thermal fluid, and will also provide help for the development of in-situ conversion technology of oil shale.
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This paper was prepared for presentation at the 2022 International Field Exploration and Devel-opment Conference in Xi’an, China, 16-18 November 2022.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (No. 51974341), the Key Technology Research and Development Program of Shandong Province (No. 2019GSF109095, 2019RKE28001), and the Fundamental Research Funds for the Central Universities (No. 20CX06070A).
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Yao, Cj., Hu, Jw., Ge, J., Zhang, Q. (2023). Study on the Property Change and Damage Mechanism of Shale Under the Effect of High Temperature Thermal Fluid. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2022. IFEDC 2022. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-99-1964-2_560
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DOI: https://doi.org/10.1007/978-981-99-1964-2_560
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