Abstract: Ordinary,middle,and high molecular polymers have been widely used to enhance oil recovery,and good results have been obtained.However,the effect of superhigh molecular polymer flooding needs to be further studied due to the deeper accumulation,higher reservoir pressure,and some restriction on technology of ploymer flooding of the oilfields in China.Therefore,an ordinary heavy oil reservoir pilot is taken for polymer flooding,based on the water and oil physical characteristics of formations,and the stability and rheology of the superhigh molecular polymer combined with purified water.The applicability evaluation of polymer flooding is carried out as well.Results show that the superhigh molecular polymer is more efficient in oil displacement compared with middle and ordinary molecular.What’s more,sand pack column and consolidated fill physical model tests are designed.It is revealed that superhigh molecular polymer flooding can enhance oil recovery greatly and the oil recovery is enhanced by 27.2% compared with water flood,especially,when pre-flooding profile controlling is performed.Besides,the method of mass slugs injection is better than slugs combination ones.When the ratio of viscosity between polymer and oil hits three times,the development effect reaches peak value.By the aid of the numerical simulation method,the technological measures for developing the four five-spot well groups in the pilot are optimized.The result shows that the timing of waterflooding of the pilot will be the best if the water cut reaches 90% and the concentration of superhigh polymers is 1500 mg/L.