2-phase fluid model based on three pseudo-components
C = \{ O, G, W \}:
O | dead oil pseudo-component |
G | dry gas pseudo-component |
W | water pseudo-component, which may include minerals (assuming formation water and injection water composition is the same) |
existing in two possible phases
\alpha = \{ o, w \}:
o | oil phase, consisting of dead oil pseudo-component and dissolved natural gas pseudo-component (called solution gas) |
w | water phase, consisting of water component only |
The model is pertinent to Dead Oil or a Live Oil staying above bubble point.
The volumetric phase-balance equations is:
(1) | s_o+s_w=1 |
where
s_o = \frac{V_o}{V} | share of total fluid volume V occupied by oil phase V_o |
s_w = \frac{V_w}{V} | share of total fluid volume V occupied by water phase V_w |
The accountable cross-phase exchanges are illustrated in the table below:
It's a typical case for undersaturated reservoir.
See Also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Fluid (PVT) Analysis / Fluid (PVT) modelling