Volume of fluid passing through a certain area A per unit time:

$\begin{array}{l}\displaystyle q = \frac{d V}{ d t}\end{array}$

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).

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