Abstract: Ground gas extraction drilling affected by mining subsidence in surface subsidence area waters, surface water and Quaternary alluvium water imported downhole through well drilling, formed mine water disaster threats. Therefore, after the end of the gas drainage well drilling, it must be timely and reliable sealed to remove the threat of mine water damage. The long-distance pipeline transport, intermittent grouting, break inspection method are used to seal 8 water drilling in collapse area of Mine. Practices have proved that the drilling closure scheme is reasonable, simple, practical, easy to operate, safe and reliable technical measure.