Process for integrated, improved oil recovery from heterogeneous reservoirs

摘要

The invention relates to a method of recovering oil from a heterogeneous reservoir, comprising a plurality of permeable porous blocks whose pores contain oil and which form interfaces with regions between the blocks having a higher permeability than the blocks. The method comprises the steps of treating the interfaces such that the wettability of the surfaces of the blocks is in a predetermined wettability range, reducing the permeability in the highly permeable regions, and flooding the reservoir by injecting a chase fluid into the reservoir. With the inventive method water phase bridges are established between adjacent blocks in the reservoir thus allowing a transmission of injection pressure for viscous displacement across the reservoir. The invention also relates to a method for long-time storing CO 2 by using CO 2 as chase fluid or foaming gas according to the inventive method for oil recovery from heterogeneous reservoirs.