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Pressure Drawdown

Created by Arthur Aslanyan (Nafta College), last modified on Nov 25, 2018

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Pressure difference between formation pressure $\begin{array}{l}p_e\end{array}$ and wellbore flowing pressure $\begin{array}{l}p_{wf}\end{array}$ at sandface:

$\begin{array}{l}\displaystyle \Delta p = p_e - p_{wf}\end{array}$

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