Abstract
Amphiphilic polymers can emulsify with crude oil to form and stabilize oil in water emulsion due to existence of hydrophobic groups, so as to improve the dispersion effect of crude oil. Supramolecular system is constructed by electrostatic interaction between amphiphilic polymer and polybasic acid, which may affect the interaction between hydrophobic groups and crude oil. Whether stable emulsion can be formed, and effect of polybasic acid structure on the stability of crude oil emulsion needs to be further studied. The effect of polybasic acid on the stability of the emulsion was studied by bottle test and stability analyzer. Furthermore, particle size analysis, interfacial tension analysis, interfacial rheological analysis, dynamic rheological characteristics analysis and visual rheology test were used to study the emulsification law of supramolecular crude oil and the action mechanism of stable emulsion. The results show that emulsion stability of different amphiphilic polymer supramolecular systems is mainly affected by interfacial tension, external phase structure strength and droplet migration rate. The higher the external phase viscosity, the smaller the interfacial tension and droplet size, the more conducive to the stability of the emulsion. From high to low, the order of stability of supramolecular system emulsion with different polybasic acids is citric acid > heptanedioic acid > disodium ethylenediamine tetraacetate > sodium polyacrylate. After the supramolecular system is constructed by electrostatic interaction between amphiphilic polymer and polyacid, the system has considerable crude oil dispersion characteristics and oil in water emulsion was easily formed, which laid a foundation for its application in enhanced oil recovery.
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