Abstract
The objective of this research was to study the long-term response of filtration properties of a porous rock sample to external confining pressure. An experimental dependence of the ultra-low-permeable limestone sample permeability on time during the loading-unloading cycle with duration of 29 days was obtained. As a result of the loading, the sample permeability decreased by more than one and a half times. The decrease was linear with time, while there was practically no visible permeability elastic reaction to an abrupt change in external load. An experimental study of the flow stabilizing process in the sample was also conducted. It is shown that the characteristic time of stabilization, both theoretically estimated and measured, is much less than the characteristic time at which the permeability change occurred during the main loading experiment. This allows us to conclude that the observed change in the permeability of the sample is related with its viscous deformation.
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Acknowledgments
The work was supported by the RFBR project No. 16-05-00869 and the state task (project No. 0146-2017-00011).
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Baryshnikov, N.A., Zenchenko, E.V., Turuntaev, S.B. (2019). The Change in the Permeability of an Ultra-Low Permeable Limestone Sample Under the Influence of Confining Pressure During the Loading-Unloading Cycle. In: Karev, V., Klimov, D., Pokazeev, K. (eds) Physical and Mathematical Modeling of Earth and Environment Processes (2018). Springer Proceedings in Earth and Environmental Sciences. Springer, Cham. https://doi.org/10.1007/978-3-030-11533-3_25
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DOI: https://doi.org/10.1007/978-3-030-11533-3_25
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