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The gas permeability of coals is altered as a result of the effective stress, matrix shrinkage and gas slippage which occur during the coalbed methane (CBM) production. In this work, the helium permeability change was primarily investigated on 15 middle and high rank coal cores under the varying effective stresses from 3.5 to 9.0 MPa in laboratory to reveal the control mechanism of effective stress...
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