Numerical Simulation of Cluster Fracturing in Horizontal Wells
In horizontal well cluster fracturing,the fracturing fluid is not uniformly distributed leading to unequal hydraulic fracture propagation,which directly affects the shale reservoir exploitation effect.Based on the finite element method,the author established a cluster fracturing model for horizontal wells considering reservoir heterogeneity,random expansion of hydraulic fractures is simulated by globally embedding 0-thickness cohesive cells and randomly assigning the modulus of elasticity and tensile strength of the grid of cohesive cells in conjunction with a probability density function to characterize the heterogeneity of the shale reservoir.On this basis,the influences of displacement and heterogeneity on the fracture expansion laws of cluster fracturing were studied.The results show that the higher the heterogeneity of the reservoir,the greater the in-terference of inter-fracture stresses on the hydraulic fractures,and the more complicated their expansion shapes are;a higher injection dis-placement is beneficial to reduce the complexity of the fracture and realize the uniform expansion of the hydraulic fracture.
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