Synonym: Laminar Inertial Turbulent IPR @ model = LIT IPR @model

One of the most general form of IPR model below bubble-point pressure:

(1)	$\begin{array}{l}\displaystyle a \, q + b \, q^2 = \Psi^n(p_r) - \Psi^n(p_{wf}) \quad , \quad p_b > p_r > p_{wf}\end{array}$

where

$\begin{array}{l}p_{wf}\end{array}$	bottom-hole pressure (BHP)
$\begin{array}{l}p_r\end{array}$	drainarea formation pressure
$\begin{array}{l}p_b\end{array}$	bubble-point pressure
$\begin{array}{l}n\end{array}$	pseudo-pressure curvature
$\begin{array}{l}a\end{array}$	laminar flow coefficient
$\begin{array}{l}b\end{array}$	turbulent flow coefficient
$\begin{array}{l}\Psi(p)\end{array}$	pseudo-pressure function specific to fluid type

It needs well tests at least three different rates to assess $\begin{array}{l}\{ a \, , \, b, \, p_r \}\end{array}$ but obviously more tests will make assessment more accurate.

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