Optimization Of High Capacity Channel Recognition And Plugging Technology In Unconsolidated Sandstone Reservoir

In terms of serious water breakthrough in Unconsolidated Sandstone Reservoir,It is of great importance to study the macroscopic throats recognition plugging technology,Which is advantageous to determine development technique in high water cut reservoir and to monitor well performance in different aqueous period.This paper mainly carries out the following research:Calculate the size of Large pore and divide large pore level in combination with correlation coefficient and conduit flow of quantitative calculation method.Analyze the feasibility of correlation coefficient method and conduit flow of quantitative calculation method in determing large pore level.Use Waring Blender method tomeasure the foam drainage half-life and the bubble volume;use rotary viscometer polymer viscosity with different concentrations,use Visual method to measure different concentration of cross-linking agent gelling time and gel strength combined with relevant identification standards.According to the results of indoor static test and evaluation,analyze the effect of different levels of large pores,the volume of injection and injection methods with orthogonal design method.The results show that: in taget of target of the recovery degree as evaluation standard use 0.3 PV crosslinking system to block the first level in the system;0.5 PV polymer to plug the second level big channel,0.4 PV bubble and polymer system to block the third level macroscopic throats.