Authors: O.V. Tailakov, M.P. Makeev, E.A. Utkaev, D.N. Zastrelov

Title of the article: A semi-empirical model of gas release from a coal seam based on the study of reservoir properties

Year: 2024, Issue: 6, Pages: 76-84

Branch of knowledge: 2.8.6. Geomechanics, destruction of rocks by explosion, mine aerogasdynamics and mining thermophysics

Index UDK: 622.691, 519.246.2

DOI: 10.26730/1999-4125-2024-6-76-84

Abstract: In the process of mining operations in the mine atmosphere, significant changes occur in the area of intensive coal extraction due to the influx of methane from the mined space, as well as from satellite formations that are separated from each other by a layer of rocks. This process is significantly influenced by the rate of methane release, characterized by a diffusion coefficient, as well as a rapidly developing system of cracks under the influence of rock pressure. The influence of the processes of softening of the carboniferous massif on the rate of methane migration into the mine workings is considered. A semi-empirical model of gas emission is presented, taking into account the physical processes of mass transfer and fluid filtration in a porous medium. During the development of the model, assumptions were made that the migration of methane into the mine workings takes place during an isothermal process, while the concentration of methane in the mixture is expressed in terms of its molecular weight. As initial data for testing the empirical model of methane diffusion, the results of field experiments were selected, including the determination of the physico-mechanical properties of the carboniferous massif and the volumes of methane entering the mine atmosphere. Numerical experiments have shown that the model is sensitive to the initial methane concentration in the satellite layers, as well as to the methane diffusion coefficient through the carboniferous massif. It is shown that the filtration time of methane decreases by 57% with a decrease in the diffusion coefficient by an order of magnitude.

Key words: Fluid filtration carboniferous massif diffusion coefficient mass transfer of methane in a rock mass numerical model

Receiving date: 09.09.2024

Approval date: 22.11.2024

Publication date: 05.12.2024

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