OIL | WATER | ||||||
---|---|---|---|---|---|---|---|
|
| ||||||
current oil saturation, s_o = 1 - s_w | current water saturation, s_w = 1 - s_o | ||||||
residual oil saturation to water displacement, below which oil is immobile | critical water saturation to oil displacement, below which water is immobile | ||||||
maximum oil relative permeability to water displacement | maximum water relative permeability to oil displacement | ||||||
oil relative permeability curvature to water displacement | water relative permeability curvature to oil displacement |
where
s_{wi} is initial water saturation which maybe equal to critical
s_{wсo} or less than critical
s_{wi} < s_{wco} like for example in petroleogenetic rocks.
The model assumes no gas presence in pores.
Fig. 1. Typical Oil+Water RPM Corey @model |
The alternative form of the Oil+Water RPM Corey @model can be presented as a function of normalized water saturation s :
(3) | s = \frac{s_w - s_{wi}}{1-s_{wi}-s_{orw}} |
which changes between s = 0 for initial water saturation s_w = s_{wi} and s = 1 for maximum water saturation s_w = 1- s_{orw}.
In this case equations (1) and (2) take form:
OIL | WATER | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
|
| |||||||||
See also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics / Relative Permeability / RPM @model
[ Permeability ] [ Absolute permeability ]