ContentsChapter 1 Introduction 11.1 Introduction 11.2 Deflection of fracturing fracture network disturbed by discontinuity inrock 21.3 Deflection of fracturing fracture network disturbed by multiple fracturesin rock 71.4 Propagation and deflection of fracturing fracture network in supercriticalCO2 fracturing 111.5 Research contents of the book 14References 15Chapter 2 Dynamic intersection and deflection behaviours of hydraulicfractures meeting granules and natural fractures in tight reservoir rock based on statistical modelling and fractal characterization 182.1 Introduction 182.2 Statistical modelling for tight heterogeneous reservoir rock 222.2.1 Statistical uniform and Weibull distribution of heterogeneous reservoir rock 222.2.2 Establishment process of statistical models with granules and natural fractures 242.3 Governing partial differential equations and numerical discretization ofhydrofracturing in fractured porous media 262.3.1 Governing equation of solid deformation 262.3.2 Governing equations of fluid flow in fractured porous media 272.3.3 Fracture criterion 272.3.4 Numerical discretization based on the combined finite element-discreteelement-finite volume method 292.4 Fractal characterization method for fracture network morphology 302.5 Global procedure for statistical modelling， fracture propagation， andfractal characterization 312.6 Results and discussions 322.6.1 Propagation behaviours and fractal characterization of fracturing fracture network in homogeneous tight reservoirs 322.6.2 Intersection and deflection behaviours of hydraulic fractures meeting granules 342.6.3 Intersection and deflection behaviours of hydraulic fractures meeting naturalfractures 382.7 Conclusions 43References 45Chapter 3 Deflection behaviours and fractal morphology of hydraulicfractures meeting beddings and granules with variable geometrical configurations and geomechanical properties 503.1 Introduction 503.2 Governing partial differential equations and numerical discretization 523.2.1 Governing equation of solid deformation 523.2.2 Governing equations of fluid flow in fractured porous media 523.2.3 Numerical discretization 533.3 Fractal morphology of fracturing fracture network based on fractal characterization method 533.4 Global procedure for deflection behaviours and fractal morphology of hydraulic fractures meeting beddings and granules 543.5 Numerical models and cases of heterogeneous reservoirs 553.5.1 Beddings with variable geometrical configurations and geomechanical properties 553.5.2 Granules with variable geometrical configurations and geomechanical properties 573.6 Results and discussion 583.6.1 Beddings with variable geometrical configurations 583.6.2 Beddings with variable geomechanical properties 623.6.3 Granules with variable geometrical configurations 663.6.4 Granules with variable geomechanical properties 693.7 Conclusions 72References 73Chapter 4 Dynamic propagation of tensile and shear fractures induced by impact load in rock based on dual bilinear cohesive zone model 774.1 Introduction 774.2 Governing partial differential equations for rock fracture induced by impact load 794.3 Fracture criteria based on dual bilinear cohesive zone model 804.4 Numerical discretization of finite elements 814.5 Detection and separation of discrete elements 814.6 Global algorithm and procedure 834.7 Results and discussion 834.7.1 Verification of tensile and shear fractures induced by impact load in rock disc 834.7.2 Dynamic propagation of fractures in rock disc 864.7.3 Dynamic propagation of fractures in rock stratum 904.8 Conclusions 95References 96Chapter 5 Center-and edge-type intersections of hydraulic fracture network under varying crossed natural fractures and fluid injection rate + +1005.1 Introduction 1005.2 Combined finite element-discrete element method and model considering hydro-mechanical coupling 1025.2.1 Governing partial differential equations 1025.2.2 Discrete fracture network model 1035.3 Numerical models of fractured reservoir embedded discrete fracture networks 1045.3.1 Geometrical models 1045.3.2 Cases study for typical pre-existing crossed natural fractures 1055.4 Results and discussion 1105.4.1 Sensitivity factors of pre-existing natural fractures 1105.4.2 Quantitative length of fracture networks 1145.4.3 Gas production in fractured reservoirs 1175.5 Conclusions 120References 122Chapter 6 Wells connection and long hydraulic fracture induced by multi-well hydrofracturing utilizing cross-perforation clusters 1256.1 Introduction 1256.2 Governing equations of multi-well hydrofracturing considering thermal-hydraulic-mechanical coupling 1276.3 Numerical models of multi-well
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