Reservoir flow with constant total compressibility: $\begin{array}{l}c_t(p)= c_t = \rm const\end{array}$

Not to be confused with Slightly Compressible Fluid since Reservoir flow depends both on Fluid Compressibility $\begin{array}{l}c_r\end{array}$ and Pore Compressibility $\begin{array}{l}c_f\end{array}$ :

(1)	$\begin{array}{l}\displaystyle c_t = c_r + c_f\end{array}$

and thus can have non-zero compressibility even for incompressible fluids.

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See also