Study on the microscopic water displacing oil mechanism experiment of high water-cut oil field

Using the pore structure characteristics analyzed from rock samples of high watercut oil field,making relative homogeneous and banded heterogeneous simulation microscopic model,designing different injection-production system,this paper has done a study on water flooding experiment.The results indicated that the pore structures distribution and injection-production system are the main effect on oil and water movement.The microscopic water displacing oil mechanism at high water cut stage is:continuous oil in the two ends flooded channel is interrupted and forms emulsified oil,which is carried out by the injected water; by changing the pressure distribution in water flooded area,pressure difference could make the fixed remaining oil produced as movable oil in some of the pore and pore group.