Heavy Oil Emulsification Viscosity Reduction System

Since viscosity is high, poor mobility, and exploitation of heavy oil is Difficulty, so the viscosity of heavy oil is the most important. However, most of China's major oilfield is high salinity and high temperature,in order to the exploitation of heavy oil is great difficulties. In this paper,we studied anti-surfactant for oilfield of high temperature and high salinity, so that it has a good adaptability and viscosity reducing effect in Bad environment, enhanced oil recovery. Main contents and results are as follows:Surfactants based on the relationship between structure and properties, through the alkylphenol ethoxylates on the introduction of different hydrophilic groups of four Negative-non-ionic surfactant, and synthesis conditions were optimized, the optimized four surfactant optimum conditions. Four of the synthetic surfactants characterized by IR, according to spectral data we concluded that the target product synthesis.We studied Synthetic surfactants on the basic properties, the results show that:HLB values greater than 13, with a strong hydrophilic, as salinity increased, the micelle aggregation number increases, the critical micelle concentration (CMC) reduce,the surface tension reduction; NPSO in a field under the conditions of formation water interfacial tension with crude oil reached 2×10-2mN/m-1, the increase of salt content to promote the interfacial tension decreased.Four kinds of surfactants on the emulsifying properties, the stability of the emulsion stability, viscosity reducing,demulsification dehydration were studied, The results show: calculated by emulsification rate, NPSO has good emulsifying ability. Inspects the emulsion stability factors. The results show that Oil-water ratio, temperature, alkali added amount and surfactant concentration has a great influence on stability. Investigated the effects of surfactant viscosity reducing effect. The results show that the viscosity reduction rate of 80% or more. Investigated the factors affecting the viscosity reducing effect, Surfactant concentrations, moisture content, oil-water viscosity ratio, salinity effect on there are some effects. Studied the four surfactants demulsification dehydration effect. The results show that NPSO at a concentration of 0.1, the dehydration rate of 90% or more, breaking the best dehydration.Surfactant mixture produced a synergistic effect, greatly improving the overall surface activity. Through the screening, optimization of the blends System, NPSO and TX to the mass ratio Between 1:1 and 2:1 is the best viscosity, viscosity reduction rate of 95%. Investigated the salt resistance of Blends with system. Results show that the Blends with system has a good salt tolerance and a good Calcium magnesium ions tolerance.Inspects the temperature performance. Viscosity reduction rate was nearly unchanged under heat treatment at 200℃. indicating that the mixed system has a good temperature resistance.