Produced or injected flowrate of water across the well-reservoir contact with the volumes measured at the sandface temperature and pressure conditions.

For MBO fluid @model the total sandface flowrate $\begin{array}{l}q_w\end{array}$ is related to surface flowrates of water $\begin{array}{l}q_W\end{array}$ as (see derivation):

(1)	$\begin{array}{l}\displaystyle q_w = B_w \, q_W\end{array}$

where

$\begin{array}{l}B_w\end{array}$

formation volume factors between separator and sandface pressure/temperature conditions

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