Oil Displacement by a Combination of Multi-chemical Slugs

Abstract

In this chapter we consider the use of slugs containing several active chemicals. In this case, oil is displaced by a surfactant slug driven through the reservoir by a polymer buffer slug and by water. The surfactant in the first slug lowers the residual oil saturation and provides for better displacement of the oil than in normal flooding. The polymer lowers the mobility of the displacing phase in the buffer slug and thus helps to prevent the thin slug of costly surfactant from being destroyed by the water-drive.