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Implication that a total pressure 

LaTeX Math Inline
bodyp(t, {\bf r})
in any point of a reservoir 
LaTeX Math Inline
body{\bf r}
is  of a porous reservoir is a sum of pressure responses 
LaTeX Math Inline
body\delta p_k(t, {\bf r})
to individual rate variations 
LaTeX Math Inline
bodyq_k(t)
 in all wells 
LaTeX Math Inline
bodyk
 connected to this reservoir:

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anchorSP
alignmentleft
p(t, {\bf r}) = p_i + \sum_k \delta p_k(t, {\bf r}) = p_i + \sum_k  \int_0^t p_{uk}(t-\tau, {\bf r}) \, dq(\tau)


In case the reservoir point 

LaTeX Math Inline
body{\bf r}
 defines location of For a given 
LaTeX Math Inline
bodym
-well location this the superposition principle can be rewritten as:

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anchorPCD
alignmentleft
p_m(t) = p_i + \sum_k \delta p_{mk}(t) = p_i +   \int_0^t p_{umk}(t-\tau) \, dq_k(\tau) = p_i + \int_0^t p_{umm}(t-\tau) \, dq_k(\tau) + \sum_{k \neq m}  \int_0^t p_{umk}(t-\tau) \, dq_k(\tau)

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