Fracturing technology and application in directional long borehole area with hard roof working face of thick coal seam
Total caving method is usually adopted to manage goaf roof in coal mining.When the overlying on the working face is hard roof,once the weight of the suspended roof reaches its load-bearing limit,a large area of roof collapse accidents are easy to occur,which is easy to cause equipment damage and casualties.In order to solve the problem that hard roof over-lying in Yadian coal mine is difficult to collapse and long distance hanging roof during mining,the fracturing technology of directional long drilling area is adopted to break the integrity and instantness of hard roof during collapse.The results showed that:the microseismic energy after fracturing decreased by about 15％compared with the same period last year.The number of high-energy events decreased by 67％and 11％in the middle and late stages of fracturing,respectively.The range of mining influence is reduced.The fracturing zone as a whole has significantly reduced weighting step spacing.Weighting strength decreases in the fracture zone.It ensures the safe and efficient production of the working face and forms a regional pressure relief technical system suitable for the geological conditions of Yadian coal mine.
hard roofperiodic weightingdirectional long boreholelocal fracturing
万方数据
维普
