In most popular practical case of a 3-phase fluid model this will be:

(1)	$\begin{array}{l}\displaystyle q_t = q_o + q_g + q_w\end{array}$

Oil sandface flowrate: $\begin{array}{l}q_o\end{array}$

Gas sandface flowrate: $\begin{array}{l}q_g\end{array}$

Water sandface flowrate: $\begin{array}{l}q_w\end{array}$

In this case the relation between the Sandface flowrates $\begin{array}{l}\{ q_o, \, q_g, \, q_w \}\end{array}$ and Surface Flowrates $\begin{array}{l}\{ q_O, \, q_G, \, q_W \}\end{array}$ is given by Modified Black Oil fluid @model:

(2)	$\begin{array}{l}\displaystyle q_o = B_o \cdot (q_O - R_v \, q_G)\end{array}$

(3)	$\begin{array}{l}\displaystyle q_g = B_g \cdot ( q_G - R_s \, q_O)\end{array}$

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

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