Mechanism of ultrasonic interference to increase the rate of CBM

In order to study the mechanism to improve penetration rate and coal bed methane desorption rate with ultrasonic interference,the effects of space on the coal reservoir permeability are analyzed.An analysis of ultrasonic-induced thermal effect is made,which will cause the increase of coal-coal-bed methane system temperature and the intensified thermal movement of coal bed methane molecules and coal molecular,promoting coal-bed methane molecules desorption and improving the rate of coal-bed methane desorption.The mechanical action of ultrasonic wave through coal bed is also analyzed.Therefore the use of ultrasonic cavitation and mechanical and thermal effects can effectively enhance the permeability rate of the reservoir and increase the coal-bed methane desorption rate,which provides a new way of thinking for coal-bed methane drainage.