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COAL PERMEABILITY ANISOTRTOPY ESTIMATION BY FILTRATION EXPERIMENTS AND FRACTURE ANALYSIS RESULTS

Experimental studies of the structure of medium-volatile bituminous coal taken from the Leninsk region of Kuzbass are performed. The main properties of endogenous cleavage fractures are determined. The dependence of coal absolute permeability on uniform compression of samples is experimentally explored. Laboratory permeability tests were conducted in the direction parallel to master cleavage fractures and bedding planes. The obtained values are typical for intensely fractured coals. Using the known models, the dependence of coal permeability on stress conditions is obtained for the directions parallel to master and side cleavage. The anisotropy of coal horizontal permeability is determined taking into account the properties of endogenous cleavage fractures. Change in coal permeability with seam depth is estimated in conditions of the Leninsk region of Kuzbass. The permeability-depth data were obtained for the conditions of uniaxial strain perpendicular to layered structure and endogenous cleavage planes.