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

(1)	$\begin{array}{l}\displaystyle q_A = \frac{d V_A}{ d t}\end{array}$

SI unit	Metric unit	Oilfield units
m³/s	cmd = m³/d	bpd

In Petroleum Industry this term depends on context and may mean pipeline flowrate or wellbore flowrate which can be measured at separator (and called Surface flowrate) or downhole (and called Sandface flowrate).

Volumetric flowrate $\begin{array}{l}q_A\end{array}$ is related to mass flowrate $\begin{array}{l}\dot m_A\end{array}$ and fluid density $\begin{array}{l}\rho\end{array}$ as:

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

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