Firstly

we evaluated the polymer microspheres and polymer properties

then

studied the migration and plugging properties of the microspheres

polymer and compound system（microspheres + polymer） by microporous membrane filtration device

and implemented the profile control and oil displacement experiments about the systems above by the parallel cores physical simulation displacement apparatus. The results indicated that the polymer microspheres was spherical micron-grade particles with superior dispersibility

and its apparent viscosity

which was much less than that of polymer with the same mass concentration

is close to that of water under the relatively high shear rate. The polymer failed to plug the micropores effectively. The plugging ability of the microspheres was the strongest

followed by the compound system. Under the condition of the strong heterogeneity

the effects of the profile control and the oil displacement of the compound system attained the best and corresponding enhanced oil recovery for high and low permeable cores were respectively 20.86 % and 36.89 %. There was a synergistic effect between the microspheres and polymer for the compound system. That the amount of the microspheres captured and migration property reduced and intensified in the porous medium mainly due to the impact of carrying and lubrication of polymer. Additionally

the influence of mobility ratio control and viscoelastic oil displacement of polymer could effectively improve oil recovery. For the actual reservoirs with relatively strong heterogeneous conditions

it was essential to take the profile control and flooding technology of the microspheres/polymer compound system into account firstly.