Effect of a type of spontaneous emulsification and viscosity reduction agent on the properties of heavy oil

In order to achieve the highly efficient development of heavy oil reservoirs, fatty acid alkanolamide bipolyoxyethylene ether (NS) is used to emulsify the oil spontaneously. After 12hours' standing at the temperature of 65 degrees C, the equal volume heavy oil can be completely emulsified in the NS solution with mass concentration of 20000mg/L to form a oil in water emulsion. Under the action of NS, the oil-water interfacial tension can be reduced to below 10(-3)mN/m, the oil-water interfacial viscosity and the absolute value of the zeta potential can be increased to a higher value, which can stabilize the emulsion. The formed droplet is small and its distribution is uniform. When the salinity is less than 50000mg/L, the properties of the emulsion is stable. The results can provide theoretical basis for field application of spontaneous emulsification flooding in heavy oil reservoirs.