Performance evaluation of temperature-resistant nano-surfactants

Abstract

Surfactant flooding is a common technique in tertiary oil recovery. However, due to the high temperature of some reservoirs and the strong heterogeneity caused by their own geological conditions, the use of common surfactants in high-temperature reservoirs is limited. Temperature - resistant surfactants can reduce interfacial tension, improve conformance and increase oil washing efficiency In this paper, a temperature-resistant nano-type surface active JCN-001 was developed in the laboratory. By testing its particle size distribution, the experimental results can determine that the average particle size range of the system is 34.29nm, so that it can play a better role in low permeability reservoir recovery. Due to its unique nano properties, JCN at 0.2% concentration can still maintain a good effect at about 110, and the oil/water interfacial tension can reach 10-4nm/m, and can also reach ultra-low interfacial tension at high temperature, and the higher the temperature, the more significant the effect According to the changes of surface tension and oil-water interfacial tension, the critical micelle concentration was determined to be about 0.2%. The static adsorption experiments and dynamic adsorption experiments were carried out. The results show that the temperature resistant nano-surfactants have strong adsorption resistance and can effectively reduce the consumption of surfactants on rocks.