The invention discloses a
coal seam gas well washing tool passing through a
glass fiber reinforced plastics screen
pipe. The
coal seam gas well washing tool passing through the
glass fiber reinforcedplastics screen
pipe comprises a washpipe, a jet-flow vibration
nozzle, a waterpower blocking type spraying
nozzle, a pressure adjuster and a guide head. The washpipe is arranged at the center of theglass
fiber reinforced plastics screen
pipe. A first elastic centering sleeve is arranged between the washpipe and the
glass fiber reinforced plastics screen pipe. The washpipe is sequentially connected with the jet-flow vibration
nozzle, the waterpower blocking type spraying nozzle, the pressure adjuster and the guide head. According to the
coal seam gas well washing of the screen pipe, due to alarge gap of the screen pipe, the flow speed of
high pressure fluid released by the washing tool lowers after the
high pressure fluid passes through the screen pipe, and therefore corresponding washing effect can not be achieved. During the cleaning process, fluid space can be shrunk and extruded by movement of a waterpower blocking ring and a movable pressing sleeve, and therefore the speed of the fluid flowing through the gas of the screen pipe increases, and cleaning effect is improved. In addition, the jet cleaning effect is improved by pressure pulse mechanism. A vibration cavity is formed in a nozzle mounting body, and the cleaning effect can be improved by pressure pulse generated by the vibration cavity.