Yeliseiev V., Lutsenko V. Filtration of desorbing gas in a bidisperse porous layer

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Parent Category: Geo-Technical Mechanics, 2024

Category: Geo-Technical Mechanics, 2024, Issue 168

Geoteh. meh. 2024, 168, 88-96

https://doi.org/10.15407/geotm2024.168.088

 

FILTRATION OF DESORBING GAS IN A BIDISPERSE POROUS LAYER

Yelisieiev V., Lutsenko V.

M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine

UDC 532.7:534.1

Language: English

Abstract. The relevance of considering filtration problems taking into account adsorption-desorption processes is associated with the safety of mining and coal developments in the presence of adsorbed gas deposits in the rock, as well as when solving environmental problems, in particular, the storage of greenhouse gases in soils and coal seams.

In this work, according to modern concepts, the porous medium is presented in the form of two types of pore channels, hydrodynamically connected to each other, but very different from each other in their characteristic diameters. It is also accepted that the surfaces of both types of channels are covered with a solid deposit of adsorbed gas, which begins to be released when the pressure drops. The main attention is paid to the filtration features of the process of desorbing gas flow in the seam. The developed model is based on the theory of inertia-free gas movement in two-scale interpenetrating porous media, differing by orders of magnitude in porosity and permeability. It is accepted that gas velocities in the seam are small, so the Darcy equation was used, written in each zone separately. The desorption component of the flow rate is determined by a linear relationship.

The calculations were carried out numerically using an explicit scheme. It is shown that the accuracy of the calculations is quite satisfactory. The change in pressure in two different channel systems is presented depending on the intensity of desorption and on the intensity of gas flow from one pore branch of the system to another. With intense flows, pressure differences between areas are insignificant. With weak flows, the differences are large, which should lead to large internal stresses. The effect of the desorption rate on the pressure distribution in the considered range of parameter changes is insignificant. Despite the fact that the pore channels in the considered medium belong to the same class, the patterns of filtration flows in channels of different sizes are very different from each other, which greatly affects the adsorption processes.

The detailing of the pore space presented in this article leads to a greater physical understanding of the kinetic stage of the mass transfer process in porous media.

Keywords: porous medium, gas, diffusion, mass transfer, filtration, desorption, microporous channels.

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About the authors:

Yelisieiev Volodymyr, Candidate of Technical Sciences (Ph.D.), Senior Researcher in Department of Mine Energy Complexes, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID 0000-0003-4999-8142

Lutsenko Vasyl, Candidate of Technical Sciences (Ph.D.), Senior Researcher in Department of Mine Energy Complexes, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID 0000-0002-8920-8769

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