A hole sealing device and hole sealing method for coal seam gas drainage

Abstract

The invention discloses a coal seam gas extraction hole sealing device and a hole sealing method. The coal seam gas extraction hole sealing device comprises an extraction pipe, two expansion water bags, a water pipe, an outer connecting pipe and two lining films, the extraction pipe penetrates from the insides of the expansion water bags, the expansion water bags are communicated through the water pipe, a valve is arranged on the water pipe, the outer connecting pipe is arranged between the expansion water bags and sleeves on the outer sides of the extraction pipe and the water pipe, two ends of each lining film are fixed on an inner wall of the outer connecting pipe respectively, the lining films and the outer connecting pipe form two material cavities respectively, and an opening is arranged on the outer connecting pipe corresponding to each material cavity and sealed through a plug. By arranging parts like the expansion water bags and adopting a mode of utilizing water pressure to squeeze out a polyurethane material for coagulation, the defect that the polyurethane material is early in coagulation and poor in hole sealing effect in the prior art is overcome.

Description

technical field [0001] The invention relates to gas drainage technology in coal mine mining, in particular to a coal seam gas drainage sealing device and a hole sealing method. Background technique [0002] Gas drainage is the fundamental measure and main way of gas control in coal mines. The sealing effect of the drainage borehole has a great influence on the drainage effect. . Due to the poor sealing of gas drainage drilling holes and serious gas leakage, the concentration of gas drainage in many mining areas cannot reach the usable concentration, making it difficult to use gas, and low-concentration gas has to be discharged into the atmosphere. This not only causes a huge waste of gas resources, but also causes pollution to the atmosphere. [0003] At present, there are mainly three methods for coal seam gas drainage and sealing: mechanical, inorganic materials and organic polymer materials. [0004] Mechanical hole sealing is suitable for short-term and short-distance...

AI Technical Summary

Problems solved by technology

Since the materials of the above two components are mixed and the foaming and solidification time is about 5 minutes, when the borehole is deep or the borehole collapses, the drainage pipe will fail to reach the predetermined position of the borehole. The phenomenon of foaming and solidification, at the same time, the two-component material expands in the free space of the borehole, and the ability to seal the cracks around the drainage borehole is also limited

Images