Physical Simulation Of Fracturing And Permeability Enhancement Of Coals Under Wave Action

The permeability of the coal reservoir is generally low in our country, relying on thenew principle, and developing new incentive technology on coal seam, is an importantapproach to improve the effect of the development of coalbed methane in our country. Sothe ultrasound and pulse wave method was used to carry out the simulation experiments inthis dissertation, the changing rules on the porosity, permeability and adsorption–desorption of the coal rock were analysised contrastive before and after the effect of thewave, relative mathematical model was established, and some innovations were achieved.Ultrasound has obvious role in improving the permeability and desorption rate of the wasfound, and permeability mathematical model and adsorption constants model of the coalrock were established under ultrasound, the mechanism are discussed from mechanicaleffect, temperature raising effect and other areas. Physical simulation experiment methodson firacturing and permeability increasing of the coal rock were established, andSystematic simulation experiments were carried out, and the relationship between theshock wave loading and the firacturing effect of coal seam was found, the mathematicalmodel between shock wave parameters and permeability changing of the coal rock wasestablished, combining experimental observation such as mercury injection, X-raycomputed tomography (CT), mechanical properties and so on, the mechanism of shockwave on increasing the permeability was explored furtherly.