A generalized entering coefficient to characterize foam stability against oil in porous media

Abstract

Foam as an injected fluid for enhanced oil recovery has shown promise, particularly in steamflooding. In addition, foam is effective as a barrier to gas coning in thin oil zone. this work unifies the two approaches presently accounting for oil-foam interactions : spreading behaviour and thin film stability. Study of the correspondences between stable pseudoemulsion films, negative entering coefficient and oil-tolerant foams. Stable pseudoemulsion films are essential to maintain oil-tolerant foams