Field-average formation pressure (<Pe>)

(1)	$\begin{array}{l}\displaystyle p_r = \sum_{k=1}^N {\rm w}_k \cdot p_{rk}, \quad {\rm w}_k = \frac{q_k}{\sum q_k}, \quad \sum {\rm w}_k = 1\end{array}$

where $\begin{array}{l}k=1..N\end{array}$ is running through wells with formation pressure tests $\begin{array}{l}p_{rk}\end{array}$ and rates $\begin{array}{l}q_k\end{array}$

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Field-average formation pressure (<Pe>)