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uparrowQ^{\downarrow}_{GC}

LaTeX Math Inline
bodyp_i = p(0)

initial formation pressure


LaTeX Math Inline
body\Delta Q (t)

full-field cumulative reservoir fluid balance

LaTeX Math Inline
bodyA_e

drainage area

LaTeX Math Inline
bodyQ^{\uparrow}_t(t)

full-field cumulative offtakes by the time moment

LaTeX Math Inline
bodyt

LaTeX Math Inline
bodyh_e

effective formation thickness averaged over drainage area

LaTeX Math Inline
bodyQ^{\

downarrow}_t(t)

full-field cumulative offtakesintakes by the time moment

LaTeX Math Inline
bodyt

LaTeX Math Inline
body\phi_e(p)

 effective porosity as function of formation pressure 

LaTeX Math Inline
bodyp(t)
 


LaTeX Math Inline
bodyQ^{\downarrow}_
t
{GC}(t)

full-field cumulative intakes by the time moment cumulative volumetric inflow from Gas Cap Expansion

LaTeX Math Inline
body
t
LaTeX Math Inline
bodyc_t(p)


total compressibility as function of formation pressure 

LaTeX Math Inline
bodyp(t)

LaTeX Math Inline
body

(t)

cumulative volumetric inflow from Gas Cap Expansion


LaTeX Math Inline
bodyQ^{\downarrow}_{WAQ}(t)

cumulative volumetric inflow from Aquifer Expansion


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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