Study On Interfacial Properties Of Oil - Water Interface Of Non - Surfactant

Anionic/non-ionic surfactants is a newly synthesized surfactant, which posses several hydrophobic and hydrophilic moieties in the same molecule have attracted considerable interest because they exhibit extraordinary surface activity. Normally, for the high temperature and high salinity reservoirs, the anionic surfactants and non-ionic surfactant are easy to get deposited, which results in low oil recovery. Therefore, there is a great importance on the study of anionic/non-ionic surfactants applying to high temperature and high salinity reservoirs. The motivation of this paper is to gain an understanding of how the structure of the anionic/non-ionic surfactant is related to surfactant performance and crude oil composition.This paper focuses on the interfacial properties between the fatty alcohol polyoxyethylene ether carboxylate(AEC) solutions and crude oils. The dynamic interfacial tension(IFT) and phase behavior studies were carried out using the AEC with different carbon chain length and EO number. The two oil samples are from different reservoir named DK1and Guan.This paper covers4sections. The first section is an introduction of the application of the anionic/non-ionic surfactants in enhanced oil recovery. And the studies of their interfacial properties are carried out by other authors. In the second section highlights the detailed characterization of DK1and Guan crude oils using analytical techniques viz. Infrared spectroscopy(IR), Brookfield DV-III Viscometer, Elemetal analysis, Thin-Layer Chromatography/Flame Ionization Detection(TLC/FID)and Gas Chromatography(GC).The decrease of IFT of the AEC solutions/crude oils system in NaCl and divalent ions solutions at60癈have been investigated in the third section. On the basis of the experimental results, one can find that (l)the NaCl concentration and divalent ions can reduce the IFT to an ultralow value.(2)IFT reduced shapely in the IAEC-7Na/APG1214mixed surfactants and IAEC-7Na/AOS mixed surfactants solutions. The emulsifying properties of AEC/crude oils system have been determined in NaCl and divalent ions solutions at60癈by getting intensive research on the stability of the emulsions, the type of the emulsions, the particle size distribution of the emulsions and the rate of the emulsification in the forth section. It is found that (l)the stability of emulsions increased with the increasing EO numbers of the AEC and decreased with the increasing carbon length of the AEC.(2)with increasing EO numbers in the AEC, increasing WOR, and increasing NaCl concentration, it was inclined to form O/W emulsion.(3)the particle size increased with the increasing WOR.(4)the rate of emulsification was influenced by the asphaltene content in the crude oil. The higher content of the asphaltene in the crude oil, the lower the rate of emulsification.