Simulation and Analysis of Proppant Transport in Complex Fractures Based on CFD-DEM Algorithm
In order to investigate the transport characteristics of proppants in fractures,the computational fluid dynamics-discrete element method(CFD-DEM)coupled simulation technique was applied to simulate the transport of proppants in complex fractures.By controlling By controlling the univariate method,the effect of three parameters,namely flow velocity,proppant concentration,and fracturing fluid viscosity,on proppant transport were studied.The results showed that,properly increasing the proppant volume fraction helped to improve its carrying capacity and thereby enhance the fracturing effect;higher injection speeds caused the proppant to settle further away from the inlet,so properly increasing the injection speed could promote the expansion and extension of the fracture;higher viscosity caused the proppant to flow out of the outlet,and selecting the appropriate viscosity was beneficial to improve the permeability and recovery rate of oil and gas.
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