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Petroleum Reservoir  that reside in reservoirs with the original temperatures lying between the pseudo-critical temperature  T_{pc} 
and the Cricondentherm  T_{\rm max}.


Natural Gas Reservoir with initial formation temperature  T_i lying between the pseudo-critical temperature  T_{pc} and the Cricondentherm  T_{c, \rm max}which initially stays gaseuous (outside Vapour Liquid Envelope) and builds condensate at separator (inside Vapour Liquid Envelope, see Fig. 1).


Fig. 1. Production path of the Retrograde Gas Condensate 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 Condensate  composition (in mol % )

Substance

Condensate 

CO22.37
N20.31
C173.19
C27.80
C33.55
i C40.71
n C41.45
i C50.64
n C50.68
C6s1.09
C7+8.21
Rs  (SCF/STB)5965
Rv  (STB/MMSCF)165
API gravity48.5
M7+184
γ7+0.816


See Also


Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology / Petroleum Reservoir / Hydrocarbon reservoir / Natural Gas Reservoir

Hydrocarbon Reserves ][ Depletion ]

References




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