Whenever is used the fluid component / pseudo-component for which the surface flowrates is measured should be explicitly specified to avoid confusion, for example:

Property	Symbol	Meaning
Oil production rate	$\begin{array}{l}q^{\uparrow}_O\end{array}$	Surface flowrate of total production of oil from all produced fluid phases measured at SPE Standard Conditions (STP).
Gas production rate	$\begin{array}{l}q^{\uparrow}_G\end{array}$	Surface flowrate of total production of gas from all produced fluid phases measured at SPE Standard Conditions (STP).
Water production rate	$\begin{array}{l}q^{\uparrow}_W\end{array}$	Surface flowrate of total production of water from all produced fluid phases measured at SPE Standard Conditions (STP).
Liquid production rate	$\begin{array}{l}q^{\uparrow}_L\end{array}$	Error rendering macro 'excerpt-include' No link could be created for 'Liquid production rate'.
Water injection rate	$\begin{array}{l}q^{\downarrow}_{WI}\end{array}$	Error rendering macro 'excerpt-include' No link could be created for 'Water injection rate'.
Gas injection rate	$\begin{array}{l}q^{\downarrow}_{GI}\end{array}$	Error rendering macro 'excerpt-include' No link could be created for 'Gas injection rate'.

The surface flowrates are also used to calculate the total sandface flowrate at downhole conditions.

In case of Volatile Oil Reservoir the relation to sandface flowrates $\begin{array}{l}\{ q_O, \, q_G, \, q_W \}\end{array}$ and mass flowrates $\begin{array}{l}\{ \dot m_O, \, \dot m_G, \, \dot m_W \}\end{array}$ are detailed in Volatile Oil Fluid @model.

The key equations are given below:

(1)	$\begin{array}{l}\displaystyle q_O = \frac{q_o}{B_o} + \frac{R_v \, q_g}{B_g}\end{array}$

(2)	$\begin{array}{l}\displaystyle q_O = \frac{m_O}{\rho_O}\end{array}$

(3)	$\begin{array}{l}\displaystyle q_G =\frac{q_g}{B_g} + \frac{R_s \, q_o}{B_o}\end{array}$

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

(5)	$\begin{array}{l}\displaystyle q_W = \frac{q_w}{B_w}\end{array}$

(6)	$\begin{array}{l}\displaystyle q_W = \frac{m_W}{\rho_W}\end{array}$

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