Coal seam gas pressure is one of the important parameters of gas, coal seam gas pressure measured accurately for ensuring mine safety is important for the effective development of coal mine gas prevention programs and measures, accurate forecast of coal and gas outburst hazard is of great significance. CMM utilization of coal mine production safety is a fundamental policy, the key lies in sealing gas drainage, "coal and gas outburst prevention regulations" clearly states in Article 48, the pre-pumping gas drilling must be tight closure. Traditional cement sealing condensation slow and easy to shrink, analysis of water, leading to poor sealing. Organic material sealing violent reaction, difficult to control and the sealing of limited length, drilling attenuation short period. The company's JD-WFK-2-type quick-setting expansion sealing agent, does not shrink, not dry, condensed and slightly faster expansion after solidification, strong liquidity, can rapidly penetrate the surrounding drilling gap and improve the sealing effect drilling . After construction inspection, is now widely used in taps, drainage holes and bottom sealing control of water holes and other drilling. Currently, JD-WFK-2 type of quick-setting expansion sealer has been widely used, at the same time, in order to adapt to the different conditions of each coal mine, the Company has successfully developed a JD-WFK-3, JD-WFK-4 type of quick-setting expansion sealing agent, in order to meet the different needs of the mining area. Features: simple operation, safe and reliable, can greatly extend the length of the sealing. Initial setting time adjustable, solidification speed, shorten the construction period. Expansion stress effects, can seal around the loose coal drilling and fracture. After solidification micro-expansion, good sealing effect. Economical and practical, relatively low polyurethane sealing costs. Adaptation gas pressure measurement, gas drainage. (Obedience through holes and vias) and prevention of water borehole seal.