Nano inverse emulsion polymerization has been used to synthesize high molecular weight polyacrylamide nanoparticle with hydrophobic nanoscale coating layer with low molecular weight. These core-shell nanoparticles modify the polymer flooding process which can eliminate almost all problems of classical polymer flooding such as polymer solution high viscosity, polymer absorption and mechanical, thermal and biological degradations of the polymer. The nanostructure was characterized by dynamic light scattering (DLS) particle size analysis, thermal analysis (DSC), and UV-Vis spectroscopy that confirm a core-shell nanostructure for produced particles with considerable interaction of two polymers with narrow size distribution (90-140 nm). Also, micromodel and solubility experiments show that this method could enhance considerably performance of the classical polymer flooding and reduce polymer usage during the polymer flooding process.