Water-contained coal layer drilling and sealing end cap apparatus

The utility model discloses a water-contained coal layer drilling and sealing end cap apparatus comprising a cotton bag and water-absorbing resin material sewed with the cotton bag. Yarn numbers of cotton used by the cotton bag for manufacturing the end cap apparatus are 16 or 32 and density is 60*60; the water-absorbing resin material possesses a great water-absorbing function and is capable of absorbing water hundreds even thousands times heavies than the weight of the material; the water-absorbing resin material possesses great water-maintaining performance; once water is absorbed and the water-absorbing resin material becomes expanded and into hydrogel, moistures cannot be separated from water-absorbing resin even with pressure application; expansion time of the end cap device is more than 400 times and expansion time requires less than 5min; the sealing end cap apparatus can be applied to coal layer drilling and sealing under coal mine well and possesses quick expansion feature; water-containing drilling holes can be effectively sealed by the apparatus and a method thereof; convenient operation, fast expansion speed and solid sealing can be achieved; and drilling and sealing efficiency can be improved.