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Modelling facility for field-average formation pressure 

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bodyp(t)
 at any time moment 
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bodyt
 as response to production flowrates history:

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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  )\, (1- R_s \, R_v)  = 0
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G_O = V^{-1} \, \delta \, Q_O + \phi_i \, \left[ \frac{s_{oi}}{B_{oi}}  + \frac{R_{vi}\, s_{gi}}{B_{gi}}\right] 
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\delta \, Q_O = - Q^{\uparrow}_O
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G_G = V^{-1} \, \delta \, Q_G + \phi_i \, \left[ \frac{R_{si}\, s_{oi}}{B_{oi}}  + \frac{ s_{gi}}{B_{gi}}\right] 
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\delta \, Q_G = Q^{\downarrow}_G - Q^{\uparrow}_G + Q^{\uparrow}_{GCAP}
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G_W = V^{-1} \, \delta \, Q_W +  \frac{ \phi_i \, s_{wi}}{B_{wi}} 
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\delta \, Q_W = Q^{\downarrow}_W - Q^{\uparrow}_W + Q^{\uparrow}_{WAQ}

where

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bodyp_i = p(0)

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body\Delta Q (t)

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bodyA_e

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bodyQ^{\uparrow}_t(t)

full-field cumulative offtakes by the time moment

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bodyt

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bodyh_e

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bodyQ^{\downarrow}_t(t)

full-field cumulative intakes by the time moment

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bodyt

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body\phi_e(p)

effective porosity as function of formation pressure 

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bodyp(t)
 

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bodyQ^{\downarrow}_{GC}(t)

cumulative gas influx from Gas Cap Expansion

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bodyc_t(p)


total compressibility as function of formation pressure 

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bodyp(t)

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bodyQ^{\downarrow}_{AQ}(t)

cumulative water influx from Aquifer Expansion

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bodyR_{sn}, \; R_{vn}

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bodyR_{sp}, \; R_{vp}

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body--uriencoded--s_%7Bwi%7D

Initial water saturation

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bodyRFO, \, RFG

Oil and Gas Recovery Factor

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