surfactant in EOR research trends

EOR technology development for surfactants increasingly demanding, requires not only that it has a low interfacial tension and low adsorption value, and requires that it has good compatibility with the reservoir fluid and low cost. 3.1 General properties of the surfactant enhanced Food dehydrator surfactant oil for general properties of a variety of measures to strengthen the surfactant complex auxiliary better performance cosurfactant and other chemical additives added sacrificial agent is added so. 3.1.1 surfactant complex mixture of suitable surfactants as complex system, not only can produce very good synergies and reduce the interfacial tension, but also to reduce the amount of primary surfactant, even Flooding The total concentration of surfactant may also be reduced. Meanwhile surfactants other properties such as salt tolerance? Adsorption heat resistance or loss reduction, etc. have been strengthened. Therefore, through a variety of surfactants reasonably oil refinery, can give full play to their respective advantages, mutual complementarity. Complex mixture of a variety of types of surfactants, may have between anionic? Anionic and nonionic? Zwitterionic? Biological surfactants and fluorine surfactants, such as between a complex mixture. As long as the selection of suitable, can effectively reduce the interfacial tension, enhanced oil recovery. 3.1.2 The combination of a variety of flooding due to various law flooding method has its own advantages and disadvantages, it is difficult to fully meet different environments reservoir flooding. So in recent years, a variety of combinations of new flooding method recovery technology, there are compound flooding and ASP flooding. Compound flooding the current study is more alkaline / polymer flooding? Surfactant / polymer flooding. The alkali / polymer flooding, in which the base class of the naphthenic oil in the soap may be formed primarily from birth carboxylate surfactants, not only in removing machine for pellets, and the formation of surfactant / polymer flooding flooding system. Because it uses a surface active agent is a self, and therefore lower cost, and good compatibility with the oil, strong compatibility. Both the polymer compound flooding flooding systems can change the mobility ratio and viscosity, improve sweep efficiency, especially the former process is simple? Way mature? Low cost, etc., with a large-scale promotion of the conditions. ASP flooding is surfactant flooding? Polymer flooding and alkaline flooding three methods of new composite technologies. It is currently more advanced recovery methods, there are many ASP flooding system has been achieved in a variety of field test area remarkable results, enhanced oil recovery rate of 20 to 35%. This is not only a base is added to the crude oil from a new born with a surfactant of the surfactant added to produce a synergistic effect, and increase the viscosity of the polymer to improve the fluid properties, and to promote the formation of crude oil Flooding and improved microemulsion flooding fluid sweep efficiency, help to improve oil recovery.