Abstract
Emulsion formation is inevitable during polymer flooding. In order to study the mechanism of the emulsion stability formed by inclusion complex and crude oil, the optimal inclusion ratio of inclusion complex was determined, and then, the properties of the emulsion such as particle size, stability, and interface film strength were tested by microscope, laser particle size analyzer, rheometer, and stability analyzer. Test results show that the addition of cyclodextrin polymer in inclusion complex have a positive effect on the stability of the emulsion. There are two main mechanisms which cyclodextrin polymers enhance the stability of emulsions. Firstly, with the addition of the cyclodextrin polymer, the viscosity of the external phase is increased, making it difficult for emulsion to coalesce and demulsify. Secondly, the cyclodextrin polymer and the hydrophobic chain of the amphiphilic polymer are adsorbed at the oil-water interface together, which enhances the interface film strength. The stability mechanism of the emulsion formed by the inclusion complex and crude oil has laid a foundation for its application in oil displacement.
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