Concentrated emulsion polymerization has great potential use in oil production due to its product characteristics of high stability and proper particle size close to formation pore

which complements the gel particles synthesized by microemulsion polymerization and suspension polymerization. A series of concentrated emulsion were prepared based on microemulsion with acrylamide and methylacryloxylethyl trimethyl ammonium chloride as monomers. The structure

size distribution

stability of this emulsion before and after polymerization were determined by conductivity measurement

rheology analysis

and microscope observation. The results showed that both viscosity and yielding stress decreased with increasing monomer concentration (CM) in water phase and had a maximum value with increasing surfactant content (mS). The same trend was found for emulsion stability. The emulsion destability of CM >40% or mS =2.5 g was separately attributed to percolation effect and insufficiency emulsification in high dispersion viscosity; especially

the particle size with 1-30 mm and bimodal distribution before polymerization evolved to that with 0.4-5 mm and unimodal distribution after polymerization. This size evolution could be explained by Kolmogoro-Hinze emulsification theory

further testified by the phenomenon that the viscosity of microsphere emulsion was enhanced as much as ten times that of emulsion before polymerization.