Klinkenberg correction

The laboratory measurements of air (or any other gas ) permeability k_air[NTP] should be translated to reservoir pressure conditions k_air[p_i] using the Klinkenberg equation :

(1)	$\begin{array}{l}\displaystyle k_{\rm air}[p_i] = \frac{k_{\rm air}[ {\rm NTP}]}{ 1+ b/p}\end{array}$

The $\begin{array}{l}b\end{array}$ value is calibrated in laboratory at reservroir pressure-temperature conditions:

(2)	$\begin{array}{l}\displaystyle k_{air}(p) = k_{\infty} \bigg ( 1+ \frac{b}{p} \bigg )\end{array}$

For low permeability formations the b-value is usually higher and the Klinkenberg correction is bigger.

Page tree

Klinkenberg correction