Numerical simulation study on fracture propagation and ripple range of pre-CO2 hybrid fracturing
In order to predict the scale of CO2 multi-stage hybrid fracturing and optimize the process parameters,numerical simulation of the fracture morphologies and swept ranges of pure CO2 and mixed fracturing under different liquid volumes and displacements were studied to fracture propagation and swept ranges of pre-CO2 hybrid fracturing.The results show that the diffusion ranges of CO2 injected increase with the increase of the injection amount;continuous CO2 injection can promote the propagation of fractures,low injection displacement and long injection period are conducive to the continuous diffusion of CO2 into the formation,and large displacement injection and short injection period are conducive to the fracture propagation.Hybrid fracturing can effectively promote continuous fracture propagation.The research results have a certain guiding significance for the optimization of CO2 hybrid fracturing parameters.
CO2 fracturingmixed fracturingspread rangefracture propagationSRVnumerical simulation
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