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

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

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

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

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

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

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

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

(8)	$\begin{array}{l}\displaystyle q_t = B_o \cdot ( q_O - R_v \, q_G) + B_g \cdot ( q_G - R_s \, q_O) + B_w \cdot q_W\end{array}$

(9)	$\begin{array}{l}\displaystyle q_t = B_o \cdot ( \dot m_O/\rho_O - R_v \, \dot m_G/\rho_G) + B_g \cdot ( \dot m_G/\rho_G - R_s \, \dot m_O/\rho_O) + B_w \cdot \dot m_W/\rho_W\end{array}$

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