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The choice of reference pressure 

LaTeX Math Inline
body--uriencoded--p_%7Bref%7D
 is made by engineer depending on common sense and objectives of the study.

The usual practise is to:to select 

LaTeX Math Inline
body--uriencoded--p_%7Bref%7D = p(t=0)
 as the bottom=hole pressure at initial time moment.select  LaTeX Math Inlinebody--uriencoded--p_%7Bref%7D = p_e(t) as the bottom=hole pressure at initial time moment.


In case the  Normalized Pseudo-Time is used to linearize the Pressure Diffusion equation the choice of reference pressure is not going to affect the solution.

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