RESEARCH AND APPLICATION OF"WEAK GEL+OIL DISPLACEMENT AGENT"ALTERNATIVE PROFILE CONTROL AND FLOODING TECHNOLOGY IN OFFSHORE HEAVY OIL FIELDS
In view of the problems of strong reservoir heterogeneity,serious water channeling,and poor water flooding development effect in Bohai heavy oil field,the physical modeling method was used to carry out the research on"weak gel+oil displacement agent"alternative profile control and flooding technology.The results show that the optimized weak gel formula is 0.3％A+0.35％B+0.15％C,the injection resistance coefficient is 2.875-8.000,and the plugging rate is 88％-90％.The preferred oil displacement agent has a mass fraction of 0.1％-0.3％and a viscosity reduction rate of 97％-99％,it can reduce the oil and water interfacial tension to 9.128 × 10-3 mN/m The"weak gel+oil displacement agent"alternative profile control and flooding method has good oil recovery effect,with the recovery factor increasing by 17.3％.After the application in the mine field,the water con-tent of the well group decreased by 7.5％,the oil production increased by 4.8 × 104 cubic meters,and the effect of reducing water volume and increasing oil production was significant.
heavy oil fieldsweak geloil displacement agentalternative profile control and flooding
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