Rapid pressure relief extraction method for short drill hole of fully mechanized coal mining face

Abstract

The invention provides a rapid pressure relief extraction method for a short drill hole of a fully mechanized coal mining face. A plurality of discharge drill holes and water injection drill holes are formed in the construction part of the working face; punching from two ends of the working face along the coal side of the working face; after drilling construction is completed, a rapid gas hole packer and a PVC pipe are used for hole sealing, and after drilling and hole sealing are completed, continuous extraction is conducted immediately; gas extraction rubber hoses are continuously connected to joints of gas extraction pipelines of the track gate road and the rubber belt gate road and are connected into a working face and connected with gas extraction drill holes, the drill hole construction inclination angle is the same as the coal seam trend, and the drill holes are arranged below the middle portions of the discharge drill holes; a water injection hole packer is used for hole sealing through pressure expansion; the water injection pressure is controlled to be 6-10 MPa, water injection is stopped when water flows out of the coal wall or the water injection pressure is reduced by 30%, and if the water injection amount of a single hole is smaller than 0.8 m < 3 >, water injection drill holes are additionally drilled in the positions 2.0 m close to the drill holes for water injection again. The method can well solve the gas control problem of the mechanical stope face, and is safe and reliable.

Description

technical field [0001] The invention relates to a coal mine gas prevention technology, more specifically, relates to a quick pressure relief extraction method for short boreholes in a fully mechanized mining face. Background technique [0002] The increase of gas gushing out during the syncline structure of the fully mechanized mining face will cause great potential safety hazards. In the prior art, although some specific drainage methods have been drawn up according to the construction environment, the efficiency is not high and the drainage is not sufficient , the comprehensive effect is unsatisfactory, and still cannot deal with the difficult problem of gas control well. Therefore, in order to effectively control, based on the existing drainage construction technology, on the basis of making full use of gas drainage drilling, it is urgent for those skilled in the art to explore a new drainage process to effectively solve the problem of mechanized mining face. Gas control...

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the present invention is to provide a quick pressure-relieving and drainage method for short boreholes in fully mechanized mining working faces in view of the above-mentioned deficiencies in the prior art, which solves the difficulty of gas control in mechanized mining working faces in the prior art. question

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