WORKED IN THE UDC 532.546 : 622.411.33 From the viewpoint of the movement and state of the gas in a coal seam, its porosity must be divided into the effective porosity m, i.e., the filtration porosity, and the sorption porosity. In the system of pores and pore channels constituting the effective porosity the gas is in the free state, and its movement is represented by filtration equations. The effective pores envelop coal particles with sorption porosity. The size of these particles may be characterized by the corrected radius R. and we can assume that in the sorption-micropore channels the gas concentration varies by the diffusion law.In consequence, the overall process of movement of gas in a coal seam will be described by the following system of equations:.. --~ grad p,p----0(pl,
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