GLOSSARY

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Pressure log-log plot of unit-rate drawdown surveypressure drop 

LaTeX Math Inline
body\delta p(t) = p_{wf}(0) - p_{wf}(t)
 and pressure log-derivative 
LaTeX Math Inline
body\displaystyle p'(t) = t \, \frac{d p_{wf}}{d t}
 (see examples at Fig. 1 – Fig. 3).

Traditionally the pressure drop on pressure log-log plots is denoted by 

LaTeX Math Inline
bodyp(t)
 which is the same as 
LaTeX Math Inline
body\delta p(t)
:  
LaTeX Math Inline
bodyp(t) = \delta p(t)
 but since it's a consistent practise it usually does not create a confusion among well test engineers. 

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