Gas Condensate Reservoirs

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yohanesnuwara edited this page Jun 18, 2020 · 2 revisions

The general material balance equation for gas-condensate reservoirs (below dewpoint pressure):

$F=G_{fgi}Eg \Delta W G_{fgi}B_{gi}E_{fw}$

Where:

$E_g=B_{tg}-B_{gi}$
$E_{fw}=(\frac{c_f c_wS_{wi}}{1-S_{wi}}) \Delta P$
$\Delta W=W_e-B_w(W_p-W_I)$
$B_{tg}=\frac{B_g(1-R_sR_{vi}) B_o(R_{vi}-R_v)}{1-R_vR_s}$
$B_{to}=\frac{B_o(1-R_vR_{si}) B_g(R_{si}-R_s)}{1-R_vR_s}$
$F=N_p(\frac{B_o-R_sB_g}{1-R_vR_s}) (G_p-G_I)(\frac{B_g-R_vB_o}{1-R_vR_s})$

In the case of no water injection:

$W_I=0$

In the case of above dewpoint pressure:

$R_v=R_{vi}=\frac{N_p}{G_p}$
$B_{tg}=B_g$ (similar to dry-gas reservoir)
$E_g=B_g-B_{gi}$ (similar to dry-gas reservoir)

In the case that all the produced gas is re-injected: $G_p-G_I=0$

$B_o$ and $R_s$ are not defined, but can be shown theoretically that:

$R_s=\frac{1}{R_{vi}}$
$B_o=\frac{B_g}{R_{vi}}=B_gR_s$