Monitoring and evaluation of hydraulic fracturing prevention and control technology for hard roof disaster in coal mine
Hydraulic fracturing technology has the advantages of good safety and simple construction process,and is widely used in the management of hard roof disasters in coal seams.However,due to the heterogeneity of the rock mass,the expansion pattern of the fracture network around the fracturing hole is complex,and the accuracy of hydraulic fracturing crack monitoring is low,making it difficult to evaluate the fracturing effect.Based on this,by comparing and analyzing the differences between common hydraulic fracturing monitoring methods and monitoring schemes,the superiority of microseismic monitoring technology is revealed,and the evaluation technology of hydraulic fracturing effect is discussed.The research shows that:Microseismic monitoring technology has wide monitoring range,high sensitivity,and good continuity;The microseismic monitoring methods such as ground monitoring,underground monitoring,and joint monitoring are suitable for different working conditions and have significant differences in monitoring accuracy;Therefore,appropriate monitoring methods should be selected based on the on-site engineering layout and actual rock conditions.The evaluation of hydraulic fracturing effect on hard roof often uses indirect indicators such as crack development length and weighting interval,while the evaluation based on direct indicators of microseismic parameters is inadequate.On this basis,development suggestions for the refinement of hydraulic fracturing effect evaluation are proposed.
hard roofhydraulic fracturingcrackmicroseismic monitoring
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