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Reservoir Pressure, psig
c
of i
c
o
c
oil b
Fig. 3-8. A comparison of values of oil compressibilities from initial pressure,
c
oi
, instantaneous
oil compressibilities,
c
o
, and oil compressibilities from bubblepoint pressure,
c
ofb
, calculated using
data from a well-known sample laboratory fluid study shows the large differences among these
properties.
Source: Data from Core Laboratories, Inc., 1994
.
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