Basing on the isothermal adsorption experiments of dry and equilibrium moisture coal samples,using the established experimental method of water injection coal samples and isother- mal adsorption experiments to simulate real reservoir conditions,and collecting samples from Qin- shui basin,Eerduosi basin,Feicheng mine in Shandong and Tuha basin in Xinjiang,the experi- ments of water injection of the coal samples were completed under high pressure(8~20 MPa) and the isothermal adsorption of the water injection ...