changes.mady.by.user Arthur Aslanyan (Nafta College)
Saved on Sep 29, 2018
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J = \frac{q_t}{2 \pi \sigma} \left[ \ln \left ( \frac{r_e}{r_w} \right) +S + 0.75 \right]
constant productivity index
p_e(t) = p_i + \frac{q_t}{ V_{\phi} \, c_t} \ t
varying formation pressure at the external reservoir boundary