Practice and recognition of secondary polymer flooding on improving development effect

On the basis of effective characteristics of secondary polymer flooding and remaining oil distribution features , by enhancing injection concentration in polymer injection period , adding slugs , deploying improved wells and other reasonable dynamic adjustment , the secondary polymer flooding target , greatly enhanced recovery has been achieved.The initial daily oil production of 3 oil wells in potential area of Xia 'ermen oilfield is about 10.5～22 t , with water cut of 20%～ 70%.After secondary polymer flooding , the effective peak increased oil is about 3.04 times before , with decreased water cut of 7.5%and enhanced recovery of 4.96%.