Abstract
Effective gas drainage and intensification of coalbed methane recovery is a challenging problem in underground mining. One of the methods to increase coal permeability is hydraulic fracturing. Long-term conductivity of hydraulic fractures is ensured using wedging materials (proppants). The effect of partial filling of an artificial fracture by proppant on coal permeability is studied. The permeability tests of samples with a longitudinal fracture filled by a rarefied monolayer of proppant were performed under conditions of triaxial compression at 1-5 MPa. It is found that with a decrease in the surface density of the proppant by 2-4 times, the coal permeability is preserved and corresponds to the values obtained for a continuous proppant monolayer. The compressibility coefficients of the natural and artificial fractures in coal are estimated based on the permeability test results. The compressibility coefficient in the propped fractures is one order of magnitude lower than in the natural cracks.
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