Mechanistic Study of the Synergistic Effects of Organic Acids and Paraffin Wax in Model Crude Oil on the Stability of Its Emulsion
The presence of organic acids and waxes is common in the crude oils produced in China.They have a significant impact on crude oil rheology and emulsion stability.The influence of organic acid and wax on the stability of model oil emulsion is explored by means of gelation characteristics,oil separation rate,and interfacial rheology.The results show that the oil separation rates of the four organic acids emulsion are 65.91%,61.36%,63.04%,and 0%at 5%wax content,respectively.This indicates that DBSA has the strongest ability to stabilize the emulsion,and hexadecanoic acid is the next,while dodecanoic acid is the worst.Under experimental conditions,the oil separation rate of DBSA-emulsion system was 0 within 180 min,showing that DBSA has good stabilizing effect on the waxy oil emulsions.By contrast,successful emulsification of the model crude oils containing the rest organic acids requires an appropriate wax content.Too high or low wax content may result in failure in emulsification.
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