The utility model belongs to the technical field of directional long
drill hole blowout prevention, and particularly relates to a directional long
drill hole blowout prevention device for gas extraction construction. A directional long
drill hole blowout prevention device for gas extraction construction comprises a
coal side, a blowout prevention box, a main negative
pressure pipe, a bag, a floral tube, a first hole sealing and
slurry discharging
pipe, a second hole sealing and
slurry discharging
pipe, a first
flange plate, a second
flange plate, a
reducer union, a first communicating
assembly and a second communicating
assembly. The first
flange plate is connected with the end, away from the
coal side, of the first hole sealing and
slurry discharging
pipe, the second flange plate is connected with the end, close to the first flange plate, of the second hole sealing and slurry discharging pipe, and the first flange plate and the second flange plate are communicated through a
reducer union. The directional long
drill hole blowout preventer for gas extraction construction has the advantages that the leakage prevention effect is good, drilling cuttings, water and gas can be effectively separated, and the gas extraction effect is improved.