The Experiment Research On The Formulation Of Self-emulsification Flooding System

The oil field in our country is in the period of high water-cut, so the EOR technologies are quickly developed. Oil recovery was enhanced more than 10-20% (OOIP) by Polymer flooding and ASP. But almost 40-60% residul oil still remains underground, therefore, it is urgent to develop new EOR technology to incease the recovery efficiency of the developed oil fields. The the self-emulsification method is proposed that the recovery can be increased remarkblely and satisfy the demand of oil .The self-emulsification would happen if separately adding the oleic acid and alkali into the oil and aqueous phase under little force.The chemical experiment research on the mechanism of self-emulsification by changing salinity of aqueous phase, concentration of oleic acid or alkali and the other factors such as polymer and alcohol was carried on the emulsification rate of kerosene or crude oil and distribution of grain-size in emulsion. The physical model flooding experiment indicated that the self-emulsification flooding formulation can enhance the oil recovery efficiecy of kerosene or crude oil to 23% and 27% after water flooding. The microscopic oil flooding experiment was analized the effection of self-emulsification on all kinds of residual oil. It concludes that self-emulsification action can efficiently flood column oil or island oil or droplet oil in pore. The new and usable oil flooding formulation is developed by the study of the combination solution of amphipathic polymer and low interfacial tension.