Mechanical Analysis of Fracture Plane Formation and Extension Direction in Hydraulic Fracturing by Crossing Holes and Its Application
Abstract：The hydraulic fracturing of coal seams in low permeability was influenced by many factors, which made fracture formation and extension direction in the crossing borehole to be hardly determined. In this paper, while the factors such as the physical and mechanical properties of coal and rock, the strata stress and so on were taken into account, analysis was carried out on the stress state around the boreholes by using theoretical derivation and numerical simulation methods. The results showed that the fracture formation and extension direction of the borehole was related to the ratio k of the stress in direction y to the stress in direction x, when k<1, the fracture formed in direction x;when k=1, the fracture formation would lose the direction;and when k>1, the fracture formed in direction y. This study results can provide theoretical guidance for the layout of fracturing boreholes in coal mines.
Keywords：crossing holehydraulic fracturingfracture directionstressnumerical simulation
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 54-57 )