| Hydraulic fracturing and cracking and extend is a complex nonequilibrium and nonlinear evolution process: on the one hand,the study of hydraulic fracturing cracks and crack and extension for fracturing design and pressure after capacity evaluation is of great theoretical significance;Underground rock,on the other hand,is transparent,inhomogeneous materials,to observation of rock damage internal crack propagation and time has brought great difficulties.Paper based on the 2013 research and development of a set of hydraulic fracturing cracks joint network simulation program(SVFN)were studied,the software is applied to calculate the displacement discontinuity boundary element method,to solve the finite element method in the simulation process cannot effectively solve the problem of the crack tip singularities,can simulate multiple fractures with a large number of natural micro crack interaction,and the dynamic process of complex crack seam web.In the process of thesis writing,programming with c + + programming language for SVFN parton program compiled and debugging.Paper introduces the displacement discontinuity boundary element method,on the fracture cases to calculate stress intensity factor and the rule of cracking and extension of cracks is presented.With numerical simulation as the main research method,the volume of artificial and natural micro cracks in the process of fracturing,artificial and natural extension of tiny cracks,cracks between the interaction relations,the cracks in the intersection,the respect such as the seam formation were studied.Through numerical simulation and analysis,summed up the volume in the process of fracturing fracture rupture and steering mechanism and control factors of formation fracturing fracture network size,finally presents a new way of fracturing and the fracturing effect of its volume is evaluated. |
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