Abstract: Through the utilization of mine gas drainage system, it is used the technology of "drilling and extraction at the same time" in drilling construction process. Promoting the use of inhaled drilling blowout preventer, coal dust and mixed gas generated during drilling construction gas will be separated to eliminate gas drilling overrun accident caused by orifice.At the same time, according to the characteristics of coal dust is easier to form turbid liquid in the water, the use of gas-water separation principle, the article developed a water-soluble type cleaner, cleaner compensates the lack of existing technology. The inhaled gas and coal dust mixed gas of blowout preventer is separated with water after mixing, and play a role in purifying coal dust, so that blowout preventer device solved effectively dust problem, which prevent dust generated during drilling into the construction of drainage system.