Characteristic Evaluation Of New Type Of Sulphobetaine Binary System

At present,ASP flooding(ASP) and binary compound flooding in domestic science and technology and the rapid development of industrialization level,Has entered the stage of industrial application.Because of the difficulty of Asp flooding produced liquid handling in the technology,and damage to the bottom, many other negative factors didn’t get the real solution, Asp flooding under the condition of limited, are facing difficulties of industrialization promotion.Non-alkali in the binary system incarnates the system characteristics.This in the form of a "effect a permanent cure",directly and effectively reduce the formation damage and alkali on the equipment of various adverse effects.In the practice operation, interoperability in the field is stronger,was welcomed by each big oilfield company.But it is not perfect that the characteristics of binary system itself can cause the increase of interfacial tension between oil and water.In the order of ultra-low interfacial tension to technology is in trouble,oil displacement efficiency is in the bottleneck.In the absence of alkali reaction,surfactants are a large number of adsorption,make it a serious loss,and for a long time,without being limited by the type of most of the surfactants is limited to the cost is higher.The research and development of surfactants were focused on the development of new kind of surfactant and suitable for mining conditions formulation optimization screening.This paper according to the present situation,for new type of sulfo betaine evaluation in terms of interfacial tension and liquidity,to new type sulfobetaine adsorption experiment was carried out and displacement of physical simulation study.Studies have shown that,when polymer molecular weight is 7-9.5 million,polymer concentration of 500 mg/L ~ 2000 mg/L,and when polymer molecular weight is 16-19 million,polymer concentration of 500 mg/L. New type sulfobetaine sulfobetaine binary system of interfacial tension can reach 10-4 mN/m orders of magnitude,adsorption of new type amount in binary and ternary system and unitary system is relatively low.It can effectively avoid the loss of oil displacement agent in production,effective to keep concentration in the system,under certain conditions,Apply three times Daqing oilfield limited company, new type sulfobetaine basic betaine surfactant will not affect the elastic properties of system.When the polymer concentration and polymer flooding of steady pressure is different,and subsequent water flooding steady pressure is different,into a positive influence on relationship,and the higher the molecular weight,the greater the tangent value.At the same time increase the molecular weight,differential pressure increases accordingly.The resistance coefficient and residual resistance coefficient,with a positive influence on relationship with polymer concentration, polymer molecular weight.Through the experimental results of heterogeneous core analysis,we think that new type sulfobetaine surfactant as SP binary system and weak base asp system(Na2CO3) and alkali ternary system(NaOH) of a surfactant in the recipe,the displacement effect are in a horizontal line.