Special non-retention releasing device for coal bed methane exploration

The utility model relates to a special non-retention releasing device for coal bed methane exploration. According to the technical scheme, the upper end of a releasing tube is connected with an upper connector, and an outer sliding sleeve is arranged on the outer side of the releasing tube and can be matched with the releasing tube body in a sliding mode. A ball base is arranged in an inner cavity of the lower end, a gas outlet hole is formed in the side wall of the releasing tube of the upper side of the ball base, and an upper isolation plug and a lower segmented connector are arranged between the outer sliding sleeve and the releasing tube. Through throwing a ball into the ball base, gas can enter a cavity which is formed by the upper isolation plug, the outer sliding sleeve and the side wall of the releasing tube, so that the outer sliding sleeve is pushed to move upwards. The lower segmented connector is connected with the side wall of the releasing tube through a shearing pin. A thrust piston is arranged on the lower side of the lower segmented connector, and a glass reinforced plastic slotted casing is arranged on the lower portion of the thrust piston. The special non-retention releasing device has the advantages that through moving of the outer sliding sleeve, screw threads of the glass reinforced plastic slotted casing are completely pushed away from a tool, and therefore non-retention releasing of metal pipe fittings is achieved; the structure is simple, and releasing is thorough without any retention; a pipe column connector in a well will not be damaged after releasing.