Surfactants for enhanced oil recovery of oil fields.
Surfactants used for enhanced oil recovery of oil fields at the late stage of field development. Developed a special mathematical model of the chemical structure of surfactant molecules in different variations possible to create different variations of polymeric surfactants used for enhanced oil recovery.
Surface-active substances (surfactants) are chemical compounds capable of adsorption due to the positive change of the phase and energy of interaction at various interfaces: liquid – air, liquid – solid, oil – water.
Surfactants – substances with asymmetric molecular structure, the molecules of which contain one or more hydrophobic radicals and one or more hydrophilic groups. This structure determines the surface activity of the molecules of surface-active substances, i.e. the ability to concentrate at interfaces section, thereby changing the properties of the system.
Surface activity, which in certain conditions may exhibit many of the organic compounds from chemical structure, in particular, debilnosti (polarity and polarizability) of the molecules and the external environment: the nature environment and the contacting phases, concentration of surfactants, temperature.
In the petroleum industry surfactants are widely used in various technological processes of drilling and production of oil by way of flooding. Surfactants reduce the capillary force holding the oil in the small pores of rocks by water flooding. The additive surfactants to the injection water greatly increases the efficiency of the process of displacement of oil by water compared to conventional water flooding. Therefore, when water reservoirs are widely used injection of aqueous solutions of surfactants.
All synthetic surfactants in its composition and chemical properties are divided into four classes: anionoactiva, nonionic, cationic and amphoteric. In a separate group highlighted the high molecular (polymeric) surfactants, consisting of a large number of repeating units, each of which has a polar and nonpolar group.
Thus in order to synthesize polymer surfactants developed a special mathematical model of the chemical structure of surfactant molecules in different variations, allowing you to create different variations of polymeric surfactants to enhance oil production. Domestic polymer-surfactant cheaper than imported counterparts.
Polymeric surfactants used in surfactant-polymer flooding is a promising enhanced oil recovery technology at a late stage of development of deposits of oil. This technology allows us to give a “second life” to existing Mature fields and to significantly increase the oil recovery factor.
– increase of oil displacement factor with water
– cheaper than imported counterparts.