Study on Viscosity Reducer Flooding Technology for Deep Low Permeability Extra Heavy Oil Reservoirs

Figure 6

Remaining oil distribution under different displacement modes: (a) represent large oil block after waterflooding; (b) represent a few smaller oil droplets after viscosity reducer flooding; (c, d) represent the direction of capillary force is consistent with the displacement direction.

(a)

(b)

(c)

(d)