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\frac{d Q_{WAQ}}{dt} = J(t) \cdot ( p_i - p(t))



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J(t) = \frac{4 \pi \sigma}{ \ln \frac{1.781 \cdot A_e^2}{ 4 \pi \chi t} }

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where

LaTeX Math Inline
bodyQ_{WAQ}(t)

water influx from aquifer at time moment

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bodyt

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bodyJ(t)

aquifer productivity index at time moment

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bodyt

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bodyp_i

initial formation pressure

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bodyp(t)

field-average formation pressure at time moment

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bodyt

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body\sigma

aquifer transmissibility

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body\chi

aquifer diffusivity

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