The influence mechanism of effective stress, adsorption effect and Klinkenberg effect on coal seam permeability

Permeability is an important parameter in the process of coalbed methane exploitation. To improve production efficiency and explore control mechanism gas flow law coal, permeability helium nitrogen same coal sample was tested under different effective stress (the difference between external pore pressure mass) by using seepage device. Based on theory, interaction stress, adsorption effect Klinkenberg controlling has been analyzed. Increasing will enhance deformation ability causing reduction size, while it also cause deformation. There a certain competition them condition, which lead to change then affect seam. The more complex factors permeability, especially laboratory experiments. Both structure body, changes influence degree apparent permeability. Under effect, may be variable. experimental results this work elaborate microscopic coal. It can not only provide guidance for injection technology, but enrich theory seam flow.