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LaTeX Math Block
anchorMatBal
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(B_o - R_s \, B_g) \, G_O +(B_g - R_V \, B_o) \, G_G + (B_w  \, G_W - \phi_n  )\, (1- R_s \, R_v)  = 0
LaTeX Math Block
anchorc_t1GO
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G_O = V^V_e^{-1} \, \delta \, Q_O + \phi_i \, \left[ \frac{s_{oi}}{B_{oi}}  + \frac{R_{vi}\, s_{gi}}{B_{gi}}\right] 
LaTeX Math Block
anchorc_t1dQO
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\delta \, Q_O = - Q^{\uparrow}_O
LaTeX Math Block
anchorc_t1GG
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G_G = V^V_e^{-1} \, \delta \, Q_G + \phi_i \, \left[ \frac{R_{si}\, s_{oi}}{B_{oi}}  + \frac{ s_{gi}}{B_{gi}}\right] 
LaTeX Math Block
anchorc_t1dGG
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\delta \, Q_G = Q^{\downarrow}_G - Q^{\uparrow}_G + Q^{\uparrowdownarrow}_{GCAP}
LaTeX Math Block
anchorc_t1GW
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G_W = V^V_e^{-1} \, \delta \, Q_W +  \frac{ \phi_i \, s_{wi}}{B_{wi}} 
LaTeX Math Block
anchorc_t1dGW
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\delta \, Q_W = Q^{\downarrow}_W - Q^{\uparrow}_W + Q^{\uparrowdownarrow}_{WAQ}
LaTeX Math Block
anchorphin
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\phi_n = 1 + c_\phi \, (p-p_i)  + 0.5 \, c^2_\phi \, (p-p_i)^2 

where

Q^{\uparrow}_tQ^{\downarrow}_t_e(p) 

LaTeX Math Inline
bodyp
_i = p
(
0
t)

initial formation pressure at  time moment

LaTeX Math Inline
bodyt
 

LaTeX Math Inline
body--uriencoded--Q%5e%7B\uparrow%7D_O\Delta Q (t)

Cumulative oil production by the time moment

LaTeX Math Inline
bodyt
full-field cumulative reservoir fluid balance

LaTeX Math Inline
bodyA_ep_i = p(0)

LaTeX Math Inline
body

--uriencoded--Q%5e%7B\uparrow%7D_G(t)

full-field cumulative offtakesCumulative gas production by the time moment

LaTeX Math Inline
bodyt

LaTeX Math Inline
bodyhV_e

LaTeX Math Inline
body

--uriencoded--Q%5e%7B\uparrow%7D_W(t)

full-field cumulative intakesCumulative water production by the time moment

LaTeX Math Inline
bodyt

LaTeX Math Inline
bodyc_\phi

pore compressibility 


LaTeX Math Inline
body--uriencoded--Q%5e%7B\downarrow%7D_W(t)

Cumulative water injection by the time moment effective porosity as function of formation pressure 

LaTeX Math Inline
body
p(t)
t

LaTeX Math Inline
body--uriencoded--s_%7Bwi%7D

initial water saturation

LaTeX Math Inline
body

Q^{\downarrow}_{GC}

--uriencoded--Q%5e%7B\downarrow%7D_G(t)

Cumulative gas injection by the time moment cumulative gas influx from Gas Cap Expansion

LaTeX Math Inline
body

c_

t

(p)

LaTeX Math Inline
body--uriencoded--s_%7Bgi%7D

initial gas saturation p(t)


LaTeX Math Inline
body
Q^{\downarrow}_{AQ}
--uriencoded--Q%5e%7B\downarrow%7D_%7BWAQ%7D(t)
cumulative Cumulative water influx from Aquifer Expansionaquifer

LaTeX Math Inline
bodyR_{sn}, \; R_{vn}--uriencoded--s_%7Boi%7D = 1 - s_%7Bwi%7D - s_%7Bgi%7D

initial oil saturation

LaTeX Math Inline
body--uriencoded--Q%5e%7B\downarrow%7D_%7BGCAP%7Dt)

Cumulative gas influx from gas cap

LaTeX Math Inline
bodyB_o

Oil formation volume factornormalized cross-phase exchange ratios as functions of reservoir pressure

LaTeX Math Inline
bodyB_g

Gas formation volume factorp and temperature

LaTeX Math Inline
bodyB_w

Water formation volume factorT 

LaTeX Math Inline
bodyR_{

sp

sn}, \; R_{

vp

vn}

Oil and Gas Recovery Factor

normalized cross-phase exchange derivativesratios as functions of reservoir pressure

LaTeX Math Inline
bodyp
 and temperature
LaTeX Math Inline
bodyT
 

LaTeX Math Inline
body--uriencoded--s_%7Bwi%7D

Initial water saturation

LaTeX Math Inline
bodyRFO, \, RFG




The MatBal equation 

LaTeX Math Block Reference
anchorMatBal
 is often complemented by constant PI model of Bottom-Hole Pressure (
LaTeX Math Inline
bodyp^{\uparrow}_{wf}(t)
 for producers and 
LaTeX Math Inline
bodyp^{\downarrow}_{wf}(t)
 for injectors):

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