Effects of induced ﬁnes migration on water cut during waterﬂooding
Permeability decline during coreﬂoods with varying water composition, especially with low salinity water, has been widely reported in the literature. It has often been explained by the lifting, migration and subsequent plugging of pores by ﬁne particles, which has been observed in numerous core ﬂood tests with altered water composition (salinity, pH) and temperature. This effect can be considered to provide a relatively simple method for mobility control during waterﬂooding. In previous research, the Dietz model for waterﬂooding in a layer-cake reservoir with a constant injection and production rate was combined with a particle detachment model to investigate the effect of ﬁnes migration and induced permeability decline on reservoir sweep efﬁciency. In this work, the analytical model was extended to waterﬂooding with a given pressure drop between injection and production wells. The modelling showed that permeability decline in the water swept zone, caused by the alteration of the injected water composition and induced ﬁnes migration, may be able to improve waterﬂood performance by delaying water breakthrough and reducing the water cut.