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where 

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bodyk=1..N
 is running through wells with formation pressure tests
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bodyp_{rk}
and rates
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bodyq_k

For the steady state flow in finite reservoir the relationship between Boundary-average formation pressure 

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bodyp_e
 and Field-average formation pressure 
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bodyp_r
 is going to be:

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p_r = p_i + \frac{q_t}{2 \pi \sigma} \bigg[ \ln \frac{r_e}{r_w} -0.5 \bigg]

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titleDerivation
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V = \pi r_e^2 h, \quad dV = 2\pi r \, h, dr 
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p_r = \frac{1}{V} \int p(r) dV = \frac{2}{r_e^2} \int p(r) \, r \, dr = \frac{2}{r_e^2} \int \bigg[ p_i - \frac{q_t}{2\pi \sigma} \ln \frac{r}{r_w} \bigg] \, r \, dr = p_i - \frac{q_t}{2\pi \sigma} \bigg[ 2 \ln \frac{r_e}{r_w} -1 \bigg]