Technology And Application Of High-gas And Low Through Coal Seam Hydraulic Fracturing Rock Cross-cut Coal Uncovering

Coal and gas outburst is an extremely complicated dynamic phenomenon working underground in coal mine.However in the process of cross-hole debunk coal seams outburst coal seam,Occurrence of coal and gas outburst is often the highlight type and harmfulness of one of the biggest strengthDue to its high strength, high frequency, harmfulness,So in China nearly dozens of oversize serious accident^ock cross-cut coal uncovering has accounted for about80%of outstanding.In order to solve this problem,Domestic and foreign many experts and scholars put forward many prominent theory and solving measures,Different methods have different problems,For example, some methods of construction process is complicated,the Cycle of rock cross-cut coal uncovering is too long or preparation roadway construction time is too long and the effect is not obvious, So this paper will delve into hydraulic fracturing of the application effect of outburst coal rock cross-cut coal uncovering.Based on Xinhong coal mine hydraulic fracturing pressure relief anti-reflection rock cross-cut coal uncovering technology research,1he theoretical analysis, numerical simulation and field test method of combining in-depth exploration,Through the analysis of the conditions of the rock cross-cut coal uncovering outburst risk,Compared with the different of the working face and regional rock cross-cut coal uncovering stress state,according to the basic principles of prevention and control of outstanding,Using hydraulic fracturing technology quickly remove security open cross-hole.Application of RFPA2D simulation software to analyze drilling hydraulic fracturing process,Through the analysis of the coal seam crack of hydraulic fracturing pressure,the influence of the radius Pressure,fracturing of coal body stress changes and the development of fracturing after to the internal cracks of coal in stable development situationAccording to the simulation results and past experience preliminarily select reasonable parameters,According to the selection of the parameters of the hydraulic fracturing experiments at uncovering coal And verify the fracturing effect.In the case of outburst prevention measures guaranteed to security fast uncovering coal seam.The fracturing process and the design of safety measures in detail,and different inspection scheme is designed-Results show that through hydraulic fracturing measures can improve the B1coefficient of permeability of coal seam,Coal seam internal fracture significantly increased,and greatly improve the gas extraction rate and to achieve the purpose of the lower coal seam outburst dangerBy the hydraulic fracturing technology at the process of Low gas permeability single coal seam rock cross-cut coal uncovering reflects the high efficiency advantages such as fast To promote the efficient production of mine,Safe development,improve the working environment has played a positive role.