Effects of buoyance on oil droplets migration in waterflood process

By studying the forces on the oil droplets in porous media,the interaction relationship among acting forces of the fluids during the process of oilfield development and the influences of acting forces on the residual oil distribution were analyzed.The action of buoyance on oil droplets during different stages of the oilfield development was considered,and the influences of buoyance on residual oil distribution were studied by Darcy law.The results show that the distribution of vertical residual oil is affected by the buoyance produced by fluids on oil droplets.The influences are relatively obvious in the inner oil layer,while it is not so obvious in the areas near the injection wells and production wells.