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LaTeX Math Block
anchorMatBal
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 A_e \, h_e \int_{p_i}^p \phi_e(p) \, c_t(p) \, dp  = \Delta Q (t) =  Q^{\downarrow}_t(t) - Q^{\uparrow}_t(t) + Q^{\downarrow}_{GC}(t) + Q^{\downarrow}_{AQ}(t)



LaTeX Math Block
anchorc_t1
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c_t(s,p) = c_r + c_w s_w +  c_o s_o +  c_g s_g  + s_o [ R_{sp} + (c_r  + c_o)  R_{sn} ] + s_g [ R_{vp} + R_{vn}(c_r + c_g) ]



LaTeX Math Block
anchorJUML4
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s_w(t) = s_{wi} + (1-s_{wi}) \cdot \rm E_{Dow}RFO(t)/E_S



LaTeX Math Block
anchorJUML4
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s_g(t) = s_{wi} + (1-s_{wi}) \cdot \rm RFORFG(t)/E_S


where

LaTeX Math Inline
bodyp_i = p(0)

LaTeX Math Inline
body\Delta Q (t)

LaTeX Math Inline
bodyA_e

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

full-field cumulative offtakes by the time moment

LaTeX Math Inline
bodyt

LaTeX Math Inline
bodyh_e

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

full-field cumulative intakes 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}_{GC}(t)

cumulative gas influx from Gas Cap Expansion

LaTeX Math Inline
bodyc_t(p)


total compressibility as function of formation pressure 

LaTeX Math Inline
bodyp(t)

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

cumulative water influx from Aquifer Expansion

LaTeX Math Inline
bodyR_{sn}, \; R_{vn}

LaTeX Math Inline
bodyR_{sp}, \; R_{vp}

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

Initial water saturation

LaTeX Math Inline
bodyRFO, \, RFG

Oil and Gas Recovery Factor




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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