Fracturing technology for surface horizontal well in deep rock burst mine
In view of the problem that the rock stratum is at 60m above the coal seam of Mengcun Coal Mine in Binchang Mining Area is thick and completely whole,which cannot be weakened by the existing measures,we carry out research and application of staged fracturing technology for surface horizontal wells.Through CDEM numerical simulation,the influence of surface horizontal well fracturing on the overburden collapse law of the working face is analyzed.The results show that sur-face fracturing can change the size of the broken block of thick roof rock,further reduce the abutment pressure of the work-ing face,and avoid the occurrence of large-area roof overhang.The field practice results show that after the staged fracturing of surface horizontal wells is carried out on the 401102 working face,the strength and duration of periodic weighting are fur-ther reduced,and the microseismic events are significantly decreased,eliminating microseismic events of above 104 J.Both numerical simulation and field practice show that surface horizontal well fracturing can weaken and break the high hard roof in advance,effectively reduce the large energy microseismic events caused by the roof breaking,and reduce the mining face pressure.It is an effective regional anti-rock burst measure to weaken the high hard roof.
surface horizontal well fracturingnumerical simulationoverburden activityeffect analysis
万方数据
维普
