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Normalised Pressure Integral = NPI

Created by Arthur Aslanyan (Nafta College), last modified on Feb 18, 2021

(1)	$\begin{array}{l}\displaystyle NPI = \int_0^t \frac{\delta p(\tau)}{q(\tau)} \, d \tau\end{array}$

where

$\begin{array}{l}\delta p =\end{array}$

Rate Transient Analysis based on NPI (see Fig. 1).

RTA NPI

Fig. 1. RTA NPI Sample. Normalised Pressure Integral (in blue) and its log-derivative (in red).

See Also

Petroleum Industry / Upstream / Production / Subsurface Production / Field Study & Modelling / Production Analysis / Rate Transient Analysis (RTA)

[ RTA Diagnostic Plots ]

[ Pressure Transient Analysis (PTA) ]

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