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