Environmental Engineering Reference
In-Depth Information
100%
Oil
Water
0
Water Content
Oil Content
0
100%
S wir
100%
S or
Figure 3.2 Enhanced oil recovery modification of oil/water (ko/w) and water/oil (kw/o)
relative permeability, as well as residual oil (Sor) and irreducible water (Swir) saturations
(after Hill, et. al., 2010)
are utilized to maintain production rates. However, even these measures
will still leave considerable residual oil behind.
3.4
Enhanced Oil Recovery
The goal of Enhanced Oil Recovery ( EOR ) technologies is to reduce
S or and shift the k o/w curve to the right, as illustrated in figure 3.2, by
changing the physical conditions of the reservoir, resulting in increased
oil recovery, reduced water cut and lower S or . This is accomplished by
modifying one, or more, of the following reservoir matrix and/or fluid
properties:
The viscosities of the oil and water phases
The interfacial tension, between the two immiscible phases
The matrix wettability
The capillary forces at the pore throat restrictions within the
matrix
Different EOR technologies modify different combinations of the above
reservoir matrix/fluid properties.
 
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