Early polymer flooding characteristics analysis and optimization adjustment technology in Bohai oilfield

Early polymer flooding was conducted in Bohai S oilfield when the water cut reached 68%.Up to now,polymer flooding field practice has been carried out for 14years,which has obtained a good effect of oil stabilization and water control.On the basis of dynamic tracking,a series of optimization adjustment measures to improve the polymer flooding effect have been proposed:to strengthen the dynamic tracking and optimization adjustment of the polymer flooding program,to carry out the comprehensive separate injection and profile control throughout polymer flooding among the injecting polymer wells to reduce low effective circulation and improve vertical sweep of polymer injection,to carry out lifting liquid measures among the producing wells to expand the polymer flooding effect,meanwhile combining with water sticking and water control to slow down the polymer crossflow.By the end of 2016,the total oil increment has increased by 370.7×104m~3,and the recovery of the control area has increased by 3.9%.