Study On The Gas Migration Law And Sealing Technology Of The Boreholes Along The Seam In Xinyi Mine

Gas drainage is an important technology of the mine gas control method, extraction from borehole sealing quality directly affect the overall effect of the gas extraction, especially hole sealing is harder in soft coal seams, and hole sealing methods and reasonable extraction is the necessary condition to ensure efficient extraction parameters, Based on the the gas migration law, to determine reasonable extraction parameters and hole sealing methods have important guiding significance.This article through the analysis of coal seam gas flow and distribution around the borehole fissure, hence the extraction from drilling for gas migration law of the radial and axial field test and research, through test on extraction under negative pressure drilling radial gas migration rule,find out the extraction and the extraction of radius of influence the quantitative relationship of the time.on the basis of the principle of the gas flow in the borehole drilled in the drilling axial gas migration rule tester is developed, for the analysis of gas migration in the borehole drilled in the situation, the hole sealing quality testing and determine the reasonable hole sealing parameters provides equipment support.Finally, through the analysis of bedding extraction from borehole leakage mechanism, combining with the existing hole sealing material and technical conditions, designed for new meanings ore bedding boring polyurethane+grouting hole sealing technology, and combined with the reasonable parameters for extraction of bedding drilling the hole sealing experiment was carried out.Field application test showed that polyurethane+grouting hole sealing technology and combining with reasonable extraction parameters can ensure good sealing drilling quality, improve the coal seam gas drainage concentration, is an effective method to improve the effect of the extraction of coal seam.