Research status and development trend of optimization Angle of hydraulic fracturing in coal seams

Abstract Drilling along the coal seam is an effective method for large-scale gas control. The distribution law of stress field determined by parameters affecting drilling seam, thereby drainage effect seam. In order to study and borehole residual plastic zone, radius softening radial displacement body on hole wall axial range are used construct calculation model sealing length; strength established through micro-element analysis packer rubber cylinder. research finally that most suitable position original rock area; reasonable length were determined.