Abstract
Using the equations of state for fractured-porous media that describe the sorptioninduced deformation of coal, we develop a geomechanical model for radial gas influx to a borehole drilled in a coal bed with the concurrent evolution of stress field in the borehole environment. A numerical-and-analytical method is proposed for solving the corresponding system of equations for poroelastic media. A relation is found between the volume of slack withdrawn in the borehole (when opening up the gas-bearing seams), the sorption-and-storage capacities of coal, the permeability k, and the horizontal component σ h of the natural stress field. We demonstrate the solvability of the inverse boundary-coefficient problem of determining k and σ h on the basis of pressure in the closed borehole. We substantiate an express-method for estimating the permeability by the measurements of pressure in the borehole operating in the “pressure drop” mode.
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Original Russian Text © L.A. Nazarova, L.A. Nazarov, M. Vandamme, J.-M. Pereira, 2017, published in Sibirskii Zhurnal Industrial’noi Matematiki, 2017, Vol. XX, No. 2, pp. 41–49.
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Nazarova, L.A., Nazarov, L.A., Vandamme, M. et al. Direct and inverse problems of gas emission and the sorptive deformation of coal beds. J. Appl. Ind. Math. 11, 236–243 (2017). https://doi.org/10.1134/S1990478917020090
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DOI: https://doi.org/10.1134/S1990478917020090