The Research On Interfacial Characteristic Of New Kind Non-alkali System

Surfactant-polymer binary compound flooding becomes one direction of the compound flooding systems, as it can be able to exert each biggest effect of surfactant and polymer. In this flooding system, the surfactant is the key of interfacial tension stability between this non-alkali flooding system and Daqing crude oil.This paper is mainly about the research on the interfacial property of the new kind aryl alkyl carboxylate surfactant, the new kind sulfo-betaine surfactant (BS11), the new kind carboxyl-betaine surfactant (BS13), and it also investigates that how EDTA, homologue combination and cosurfactant influence the interfacial property of aryl alkyl carboxylate surfactant, the concentration of surfactant, the concentration of alkali, temperature, bivalence ion, salinity influence the interfacial property of betaine surfactant flooding system, and the compound flooding systems which are SP and ASP contain BS11 and BS13 have an effect on cores under the condition of Daqing.Research indicates that benzoate-18-potassium and potassium oleic acid combination solution, benzoate-18-potassium, naphthyl-18-potassium and potassium oleic acid combination solution all can form ultra low interfacial intension (<10-3) with Daqing crude oil under the condition of non-alkali. BS11 and BS13 flooding system not only do that but also can be thermostable, salt-resisting, divalent ion-resisting, and they also have a broad concentration range of surfactant to form ultra low interfacial intension. Adding a little sodium phosphate as sacrifice agent to the BS11 and BS13 non-alkali flooding systems, they will have the same flooding effect as the ternary compound flooding adding strong alkali which the recovery ratio all can reach above 25 percentages. The exudation from cores which is the binary system fluids can form ultra low interfacial intension (<10-3) with Daqing crude oil. So it is that the working fluid can form ultra low interfacial intension with Daqing crude oil in the whole length of core under the condition of the experiment.This research can offer the experimental and practical reference for which can industrialize the surfactant and polymer binary flooding system in each oil field.