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ESTIMATION OF PROPPED FRACTURE COMPRESSIBILITY IN COAL SEAM
Abstract
An effective method to enhance productivity of gas drainage wells in gas-bearing coal seams is hydraulic fracturing. Proppants are usually used in the hydraulic fracture to maintain its aperture, long conductivity and gas recovery from developed coal seams. In the paper the experimental results of gas permeability of the solid coal cores, coal specimens with non-propped and propped artificial longitudinal fractures are presented. The data were received for different stress conditions: effective stress varied from 0,9 to 5 MPa. In the experiments one type of coals (grade D) was used. The coal permeability, propped and non-propped fracture permeability were determined by performed filtration experiments. According to the obtained experimental data and the known method [1] compressibility of the nature, propped and non-propped fractures of experimental coal specimen was estimated. It is observed, that the use of proppant to maintain artificial fracture aperture can significantly enhance coal permeability about 1-2 orders higher than the values of the original samples. The propped fracture compressibility decreases by 2 orders compared to values for natural fractures in coals. Thus permeability of the propped fractures is less sensitive to stress conditions.
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References15
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