In the process of CO2 gas flooding,the study of the gas front migration and influencing factors can help us to prevent gas channeling,improving the development effect.Based on long-core CO2 displacement experiments and X-CT tests,this paper reveals the influence of heterogeneity on the migration of the gas injection front.The numerical simulation of the extraction mechanism model summarizes the migration characteristics of the pressure front,component front,and gas injection front under heterogeneous conditions,clarifying the influence of different injection rates on the migration of the gas-driving leading edge.The results show that the migration speed of the gas injection front increases with the increase of permeability,and the migration speed in high-permeability cores is more than 25%faster than that in low-permeability.In the mechanism model,the pressure leading edge is close to hexagonal in the case of the seven-point method,while the gas displacement front and the component front are close to the rhombus.With the increase of injection time,the moving speed of the gas front decreases and then increases,and the rising speed of the gas front migration in the later stage becomes bigger and bigger.Furthermore,the higher the gas injection speed is,the faster the speed of the gas front migration becomes.The research results provide a basis for the prediction and control of the gas injection front in the development of low-permeability reservoirs.
front migrationCT saturation testheterogeneitynumerical simulationgas injection rate
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