Study on the Cracking Parameters of Directional Hydraulic Fracturing of Hard Roof
In order to solve the problem of hard roof collapse and hard falling,this paper takes Baozigou coal mine as the research background,uses numerical simulation software to analyze hydraulic fracturing,and finds that with the passage of fracturing time,the deflection of fractures finally turns parallel to the direction of maximum principal stress.At the same time,the rock cracking propagation under different stress differences,liquid injection rates and borehole spacing is studied,and it is found that with the increase of stress difference,the cracking pressure gradually decreases,and the fracture deflection angle gradually increases,and with the increase of borehole spacing,the maximum fracture width at this time shows a gradual decreasing trend,and the propagation radius shows a gradual increasing trend,which provides a reference for the design of subsequent hydraulic fracturing schemes.
numerical simulationrigid top platefracturing parametersextended radius
万方数据
维普
