The Adaptability Reserch Of Different Displacement System To Different Heterogeneous Reservoir

The paper first had conducted the system research to the interface behaviour of betaine surfactant BS and the heavy aklyl benzenes sulfonate surfacant SY and had given the different displacement system's formula.The result showed that:The BS betaine surfactant may form the ultra lower interfacial tension of 10-3mN/m magnitude in wide concentration range under nonalkali condition;The right amount sodium phosphate was joined in the BS surfactant solution to take the sacrifice medicinal preparation which could faster the speed to achieve the most lower interfacial tension and the balance interfacial tension in water-oil interface and the suitabl concentration sodium phosphate could reduce the water-oil interfacial tention.The independent system of heavy aklyl benzenes sulfonate surfactant SY was unable to reach the ultra lower interfacial tention of 10-3mN/m magnitude,joining the right amount strong alkali in the system,the water-oil interfaicial tension could reach ultra low.Through the interfacial tension determination and the indoor physical analogue displacement experiment we could make out the displacement system's formula having ultra lower interfacial tension:The weak alkali ternary compound floodingsystem's formula was(BS 0.3% + different concentrated polymer +Na3PO40.4%)0.35PV,the SY strong alkaliternary compound flooding system's formula was (SY 0.3% + different concentrated polymer +NaOH1.0%)0.35PV,no-alkalibinary system's formula was(BS 0.3% + different concentrated polymer)0.35PV and the formula of independent polymer system was different concentrated polymer 0.35PV (the viscosity of following protection plug was half of the primarily plug,0.2PV).At the base of research had maken,this article mainly studied the compatibility of different displacement system to different heterogeneous deposit under the same coefficient of variation and permeability through indoor physical analogue displacement experiment.Appraisal of displacement characteristics was carried on to above displacement system,and effecting factors of displacement characteristics of each displacement system were elaborated in details.The result of research showed that: Under the same viscosity the SY strong alkali ternary compound flooding system had the equivalent recovery compared with the BS surfactant sodium phosphate flooding system .The BS betaine surfactant compound flooding system had strong ability to enhancing the recovery,the flooding driving efficiency of highly concentrated polymer solution was not well. Under the same polymer density conditions, the BS surfactant sodium phosphate flooding system had the best recovery, the SY strong alkali ternary compound flooding system had the equivalent recovery compared with the BS surfactant flooding system ,the flooding driving efficiency of highly concentrated polymer solution was bad. The permeability,the coefficient of variation and system's viscosity were three important factors affect the displacement characteristics,the recovery ratio of various displacement system increased along with the permeability and system's viscosity increasing and first increased along with the coefficient of variation increasing and then reduced.When the coefficient of variation was 0.72, chemistry drives the recovery ratio was highest.When the coefficient of variation was big,relative enhanced the viscosity of displacement system could realize the good mobility control,still may achieve the good displacement characteristics.