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Fig. 5.B.2 – Wellbore storage loglog response
5.B.2
Specialized analysis (Cartesian plot)
A unique slope on the loglog plot corresponds to a linearity of the pressure response on a
Cartesian plot. This Cartesian plot may show either P or
P vs.
t.
Below is shown a Cartesian plot of pressure versus time.
Fig. 5.B.3 – Cartesian plot of pressure vs. elapsed time
The early time straight line corresponding to the pure wellbore storage is given by:
Wellbore Storage Straight line:
tm t
C
qB
p
24
So one can get the wellbore storage constant with:
Specialized plot result:
m
qB
C
24