Study On Profile Control System Optimization And Injection Parameter Of Fuzzy Ball

There is more than 90% continental clastic deposits of reservoirs in china.Compared with marine sedimentary reservoir in foreign,the heterogeneity is stronger,the viscosity of oil is higher.After water flooding,the residual oil content is more than30%.It is great potential to enhanced oil recovery.Foam flooding is low density,high sticky,low leakage and less damage for the reservoir.It can make the blocked structure by Jiamin effect and foam deformation in the high-permeability channel.In this paper,fuzzy ball is selected as the foam flooding agent.Firstly,improve the formulation by the thermochemical.Then,optimize the fluid formula by routine performance and core plugging and oil displacement with two different permeability cores.At last,optimize the injection parameters to enhanced more oil recovery.Complete the thermodynamic stability calculation by some of the polymer components to the most stabilized.Make sure the last formula by apparent,plastic viscosity,foaming volume and half-life,which is:water+1.50%?2.50%layering agent+0.25%?0.30%fuzzy agent+0.25%?0.30%membrane agent+0.6%?0.8%nucleating agent.Condut plugging experiments by core with seams and without seams.The highest pressure is 12.37MPa and 25.84MPa for the core with and without seams.Enhanced oil recovery 27.65%after water flooding by paralleling 1200^-3?m²and 200^-3?m² cores.By contrast experiments,improve injection parameters such as sequence,velocity,rounds and permeability-grade.The experimental results shows that when the speed is1.5m L/min,3 round,the sequence is fuzzy ball after polymer,flooding can get out of the most oil recovery.The permeability-grade is bigger,the more obvious effects.At last,The fuzzy ball fluid is salt-resisitance and temperature-resistance,which a good effect in blocking the oil drive.It is suitable for deep excavation and extraction in heterogeneous reservoir and has more potential by optimizing injection parameters.