Amount of fluid mass passing through a certain area $\begin{array}{l}A\end{array}$ per unit time:

(1)	$\begin{array}{l}\displaystyle \dot m_A = \frac{d m}{ d t} \Big\|_A = j_m \cdot A\end{array}$

where

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

SI unit	Metric unit	Oilfield units
kg /s	kg /s	lb/s

Mass flowrate is related to volumetric flowrate $\begin{array}{l}q_A\end{array}$ and fluid density $\begin{array}{l}\rho_A\end{array}$ as:

(2)	$\begin{array}{l}\displaystyle \dot m_A = \rho_A \cdot q_A\end{array}$

In case of Volatile Oil Reservoir the connection with surface flowrates will be:

(3)	$\begin{array}{l}\displaystyle \dot m_O = \rho_O \cdot q_O\end{array}$

(4)	$\begin{array}{l}\displaystyle \dot m_G = \rho_G \cdot q_G\end{array}$

(5)	$\begin{array}{l}\displaystyle \dot m_W = \rho_W \cdot q_W\end{array}$

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See also