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

In case of Volatile Oil Reservoir the relation to surface 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 relations are given below:

(1)	$\begin{array}{l}\displaystyle q_o = \frac{ B_o \cdot ( q_O - R_v \, q_G) }{1- R_v \, R_s}\end{array}$

(2)	$\begin{array}{l}\displaystyle q_g = \frac{ B_g \cdot ( q_G - R_s \, q_O)}{1- R_v \, R_s}\end{array}$

(3)	$\begin{array}{l}\displaystyle q_w = B_w \cdot q_W\end{array}$

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