Page 39 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2

Basic Principles, Definitions, and Data 27

.-
m
n
lL
b
G
W
a
3
v)
v)
W
a
n
;
I-
W
J
m
m
3
m
700 800 900 1000 I 100
PSEUDO CRITICAL TEMPERATURE. OR
Figure 5-23. Variation of pseudo-critical temperature with specific gravity and
bubble point of liquid corrected to 60°F [28].

pressure can be approximated from Figures 5-24 and 5-25 which were developed
by Ramey [26] from Standing's [l] data:

(5-16)

Bo can be estimated from Figure 5-3, and gravities of both oil and gas must be
known. Oil compressibility is often on the order of 10 x psi-'.

Water Compressibility. Although the best approach is to obtain water com-
pressibilities from laboratory PVT tests, this is seldom done and the use of
correlations [22] such as are given in Figures 5-26 and 5-27 is often required.
The compressibility of nongas-saturated water ranges from 2 x psi-' to
4 x psi-' and a value of 3 x psi-' is frequently used [13]. The com-
pressibility of water with dissolved gas ranges from 15 x psi-' at 1,000 psi
to 5 x loM6 psi-' at 5,000 psi [26].
Estlmation of Fluid Properties with Programmable
Calculators and Personal Computers

With the recent widespread use of hand-held programmable calculators and
desk-top personal computers, engineers are no longer faced with estimating fluid
properties from charts and graphs. Much of the data in the literature have been