Undersaturated Oil Reservoir with initial temperature slightly lower the pseudo-critical temperature and the Vapour Liquid Envelope having quality lines tighter spaced at reservoir conditions while separator conditions lying on relatively low quality lines.
A small reduction of pressure below the bubble point vaporizes a significant fraction of the oil.
Fig. 1. Production path of the Volatile Oil Reservoir on the Phase Equilibrium Diagram. The downward solid black arrow shows a reservoir pressure depletion path. The downward grey dash arrow shows a wellbore lift pressure drop path. |
Table 1 – Example of Volatile Oil composition (in mol % )
CO2 | 1.82 |
N2 | 0.24 |
C1 | 57.60 |
C2 | 7.35 |
C3 | 4.21 |
i C4 | 0.74 |
n C4 | 2.07 |
i C5 | 0.53 |
n C5 | 0.95 |
C6s | 1.92 |
C7+ | 22.57 |
Rs (SCF/STB) | 1465 |
Rv (STB/MMSCF) | 680 |
API gravity | 36.7 |
M7+ | 240 |
γ7+ | 0.864 |
See Also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology / Petroleum reservoir / Hydrocarbon reservoir / Oil Reservoir / Undersaturated Oil Reservoir
[ Hydrocarbon Reserves ][ Depletion ]
[ Volatile Oil ][ Volatile Oil Fluid @model ]
References