定向长钻孔分段压裂促抽效果影响因素分析OA

To clarify the mutual influence among multiple borehole fracturing in the directional long-borehole segmented fracturing gas drainage project and provide a robust basis for optimization,this study investigate the fracture propagation patterns using the PFC discrete element numerical simulation.The controlling factors affecting the drainage promotion effect of this technique were systematically analyzed and validated through engineering applications.The research results indicate that appropriately increasing the borehole spacing during multi-directional long-borehole segmented fracturing can effectively promote the expansion of fracture propagation;employing a staggered arrangement of fracturing sections is more conducive to fracture propagation,significantly enhancing the influence range and permeability improvement effect;and the injection and fracturing sequence of first fracturing the boreholes on both sides and finally the middle borehole yields better fracture numbers and drainage promotion effects compared to other injection and fracturing sequences.Combining numerical simulation results with practical engineering experience,the optimal fracturing technique for the directional long-borehole segmented fracturing gas drainage project was determined.This provides theoretical support and technical solutions for enhancing coal seam permeability and improving gas control efficiency through hydraulic fracturing technology.