Abstract
Gas disasters have been affecting coal mine safety production. With the gradual deepening of coal resources development, whether gas extraction meets the standard is particularly important. In view of the low extraction efficiency, through theoretical and numerical simulation combined with field measurement, the upper and lower cross bedding drilling is studied. Through the simulation and comparison of gas pressure at different extraction time and the gas pressure changes when the spacing of boreholes is 8 m, 10 m, and 12 m, the results show that, under the designed parameters, when the pressure value at the middle of the two boreholes starts to be less than 0.74 Mpa, the standard extraction time of the upper and lower cross strata boreholes is 160 days, and the most suitable spacing of boreholes is 10 m. Combined with the actual situation of Baode Mine, the extraction effect of cross drilling and parallel drilling was compared. The research shows that the predrainage effect of cross drilling is obviously better than that of parallel drilling. Cross drilling improves the predrainage effect, prolongs the action time of gas extraction by drilling, and effectively eliminates the risk of coal seam outburst.
Highlights
China has been developing sustainable energy, pursuing energy transformation, and has been reducing the proportion of coal
Coal mine gas extraction technology [2,3,4] has become an important means of controlling coal seam gas
In view of the low and poor mining efficiency of coal seam, Yang [6] adopted the three-dimensional cross drilling technology to carry out field tests on 8401 working face in order to ensure daily safe and efficient production of coal mine. e gas drainage technology is compared with the traditional drilling arrangement methods such as horizontal cross hole and parallel hole. e results show that the drainage effect is better than that of plane intersecting holes and parallel holes arrangement, which effectively reduces the occurrence of coal mine accidents and opens up a new technical way
Summary
China has been developing sustainable energy, pursuing energy transformation, and has been reducing the proportion of coal. Rough the theoretical analysis and experimental study of cross drilling, Wang et al [5] show that cross drilling can increase the amount of gas pumped from coal seam without increasing any engineering quantity, compared with the conventional way of hole layout. In order to solve the present situation that the gas extraction effect of coal seam is not ideal, Wang [7] applied three-dimensional cross drilling technology to study gas drainage effect of bedding and compared it with other traditional gas extraction technologies and analysis, and the results confirmed that the three-dimensional cross drainage gas drilling technology does have its advantages, better. Zhu and Xiang [12] combined with the conditions of a coal seam in Shanxi, compared the extraction effects of different aperture sizes and different spacing in the cross hole layout, and analyzed the optimal extraction parameters of boreholes. According to the actual situation of Baode Mine, the data were analyzed, and the extraction parameters of cross drilling were obtained, which were compared with parallel drilling
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