Study On Evaluation Of Heterogeneous System Properties And Effect Of Oil Displacement

Heterogeneous system flooding has successful cases at home and abroad,and this technology has also matured.However,in the case of heterogeneous reservoirs,different heterogeneous systems have different mechanism and effect of water control and oil increasing on the issue of the water content rising too fast after water flooding.Therefore,it is necessary to develop a comparative study of internal heterogeneous system flooding under heterogeneous conditions within the layer.In this paper,three kinds of heterogeneous systems are chosen as the research object.Firstly,the interfacial tension of oil and water and the change of wettability of cores are evaluated by static experiments,and the water swelling and sealing properties of the two microsphere systems are evaluated.The plugging conditions and the blocking ability of the microspheres were studied.Finally,a microsphere system suitable for the heterogeneous reservoir was screened;finally,the two types of pre-crosslinked gel particles were subjected to expansion and stability,plugging conditions,and plugging capabilities.The research of the aspect has optimized the PPG system suitable for blocking the heterogeneous reservoir.Secondly,two kinds of optimal systems with large size and high strength after expansion were studied for the long core migration rule,and compared with the regular flow of polymer in long cores.Finally comparing the oil displacement effects of three heterogeneous systems in heterogeneous reservoir.Finally,it was concluded that nano-dioxosilicon does not have the ability to plug large pores.The oil displacement method is to peel small oil droplets by changing the wettability of the core and reducing the interfacial tension between oil and water.The microspheres and PPG can be transported in the core.However,their migration patterns are different;under heterogeneous conditions within the target reservoir,both microspheres and PPG improve the core heterogeneity.However,the injection ofmicrospheres or PPG alone contributes less to the recovery of crude oil,and the use of microspheres,PPG and polymer blending systems,respectively,has a significant effect on water control and oil enhancement,and the use of PPG and polymer complex systems in water The degree of recovery after flooding can be increased by 23%,and the use of microspheres and polymer complexes can increase by 29.3% after water flooding.