After the long-term water and polymer flooding

the remaining oil distribution in the late stage of high water cut is complex

and it is difficult to select fracturing wells and layers. In order to solve these problems

an improved calculation method of the dimensionless liquid production index for wells in polymer flooding oilfields is proposed to evaluate the production capability and changes

then the wells that the dimensionless liquid production index dropped more than 30 % are selected. At the same time

combined with the fine geology and reservoir analysis

the quantitative characterization of displacement multiple in the late stage of high water cut is studied and the remaining oil for each layer is evaluated. At last

the method of selecting fracturing well and layer in Bohai J Oil Field is established. Field applications showed that this method was reasonable and effective

the oil production incremental for each well after fracturing is about 14 to 42 tons. It can also provide reference for the selection of fracturing measures and the evaluation of well stimulation potential of similar oilfields in the late stage of high water cut.