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The alternative form is to write down equations 

LaTeX Math Block Reference
anchorPZ
 and 
LaTeX Math Block Reference
anchoruu
 in reservoir volume outside wellbore and match the solution to the fluid flux through the well-reservoir contact:

LaTeX Math Block
anchorPZ1
alignmentleft
\phi \cdot c_t \cdot \partial_t p + \nabla  {\bf u}  
+ c \cdot ( {\bf u} \, \nabla p)
= 0
LaTeX Math Block
anchoruu1
alignmentleft
{\bf u} = - M \cdot ( \nabla p - \rho \, {\bf g})
LaTeX Math Block
anchorqk
alignmentleft
\int_{\Sigma_k} \, {\bf u} \,  d {\bf \Sigma} = q_k(t)
LaTeX Math Block
anchorqGamma
alignmentleft
\int_{\Gamma} \, {\bf u} \,  d {\bf \Sigma} = q_\Gamma(t)

where

LaTeX Math Inline
body\Sigma_k

well-reservoir contact of the 

LaTeX Math Inline
bodyk
-th well

LaTeX Math Inline
body\Gamma

LaTeX Math Inline
body--uriencoded--d %7B\bf \Sigma%7D

normal vector of differential area on the well-reservoir contact, pointing inside wellbore

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