Segmented hole sealing method for bedding gas drainage

Abstract

Provided is a sectionalized hole sealing method for bedding gas extraction drilled holes. After gas extraction drilling construction is completed, sponge wraps the front ends of hole sealing tubes with the lengths not less than 20m in a winding mode and then polyurethane materials coat the sponge, elastic partition plates are arranged on the tube sections of each hole sealing tube in a sectionalized mode, then, the hole sealing tubes are sent into gas extraction drilled holes, quick-drying cement plugs are adopted to seal the hole openings of the gas extraction drilled holes, and the grouted cement materials are injected in hole sealing spaces through grouting tubes. Under the action of grouting pressure, each section of relatively independent hole sealing space is filled with the grouted cement materials, and the grouted cement materials enter gaps of media around the drilled holes to the maximum extent so that the drilled holes can be sealed. Due to the fact that the method is characterized in that each sealed hole is long and the partition plates are used for dividing grouted sections into a plurality of hole sealing spaces, sedimentation and uneven solidification of the grouted cement materials in the hole sealing spaces can be effectively controlled, sealing of the gaps of the media around the drilled holes is facilitated, the hole sealing effect is good, concentration of gas extracted after the hole drilling can be kept in a high level for a long time, and the coal bed gas extraction effect can be obviously improved.

Description

technical field [0001] The invention relates to a drilling hole sealing method, in particular to a segmented drilling hole sealing method suitable for bedding gas drainage with a certain inclination angle. Background technique [0002] According to the "Regulations on the Prevention and Control of Coal and Gas Outbursts" promulgated and implemented by the State Administration of Work Safety on August 1, 2009, gas control in outburst coal seams must follow the principle of "regional outburst prevention measures first and local outburst prevention measures supplemented", namely For outburst coal seams, it is necessary to adopt regional outburst prevention measures first to eliminate the outburst danger of the coal seam before mining operations can be carried out, and the regional outburst prevention measures should be placed in the first place. At present, regional outburst prevention measures include protection seam mining technology and coal seam gas pre-extraction technolog...

AI Technical Summary

Problems solved by technology

At present, there are many methods for drilling and sealing holes along the bedding, such as polyurethane sealing and cement material sealing. Due to the short length of the sealing hole and the unfavorable factors such as the settlement of the cement grouting material in the sealing space, the sealing effect is caused. Not good, resulting in poor drainage effect of bedding boreholes. The main performance is that the gas concentration drops rapidly, that is, the drainage time of high-concentration gas in the borehole is relatively short, which in turn affects the gas drainage effect

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