Characteristics of foam flow in fractures and prediction of preferred paths by improved Dijkstra algorithm
Foam flow characteristics in complex fracture networks are still unclear.In this study,a va-riety of combined visual fracture models were used to observe the flow characteristics of foam in the fracture.Then,the improved Dijkstra algorithm was used to determine the weighted graph of the fracture network nodes,and the preferred flow paths of the foam were predicted.The results show that the flow resistance reaches the maximum when the foam volume fraction is 90％.When the foam flows in parallel fractures with different openings,it flows preferentially in the fractures with large o-penings,and there is gas retention in cracks with small openings.In the complex fracture network model,the Dijkstra algorithm is improved based on the foam fluid's sweeping range and plugging mechanism,and the simulation results can be fitted to the experimental results to a certain extent.These findings reflect the necessity of considering fractures when foam flows in reservoirs.
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