《Table 5.Comparison of field test results of continuous and dispersed flooding systems.》

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《Comparison of oil displacement mechanisms and performances between continuous and dispersed phase flooding agents》

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The field test results of two flooding systems are shown in Table 5[28].It can be seen that，in the test area of dispersed phase flooding agent，the daily oil production increases by 2.9times during the chemical injection.While that in the test area of continuous phase flooding agent the daily oil production increases 1.1 times.The maximum water cut drops of the two agents during chemical injection are 46.2%and 32.2%respectively.Due to continuous injection of viscous fluid，both oil and water flowing resistance greatly increase，which results in the low liquid supplying capacity of the producers.Therefore，it is difficult to displace the residual oil in low permeability area，and the oil production increase and water cut reduction could not be further improved or sustained for a long period.On the contrary，due to the properties of“plugging large pores but not small ones”，a large amount of SMG particles continuously and alternately inhibiting the flow in high permeability area or large pores，and the water is diverted into low permeability area or small pores，to efficiently displace the remaining oil there，which obtained better oil increment and water reduction effect than the continuous phase flooding system.