LD10-1 oilfield in Bohai reservoir is a thick reservoir with high average permeability

serious heterogeneity

low cementing strength of rock and high single well injection-production strength. For this reason

during the development of the profile control and oil displacement technology of polymer gel in the early stages

the contradiction between and within layers caused by the polymer retention and scour are obvious. Then we test the development of the comprehensive treatment of the effect screening and performance evaluation

profile control

plug release of modifying and flooding agent

alternative injection of the profile control and oil displacement agent and water after polymer flooding. The results showed that

with the same dosage of the polymer gel

and compared with the whole slug injection method

the gel and water alternating injection method can slow down the speed of the entry profile reversal

and extend the sweep coefficient of the medium and low permeability layer. When they are used together

the utilization level of the medium and low permeability layers is further enhanced

and the effect of oil increasing and precipitation is obvious.