Page 492 - Petrophysics
P. 492
460 PETROPHYSICS: RESERVOIR ROCK PROPERTIES
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10000
1000 -- -
~
.~ -
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P
~-
100
10 I
0.01 0.1 1 10 I00
Repr
Figure 7.10. Friction factor for porous rock[40/.
of gas through porous media in terms of the Reynolds number and the
friction factor [40]. They found that in order to analyze the gas flow rate
in porous media at very high velocities, i.e., under the turbulent flow
regime, the friction factor must be plotted versus Reynolds number,
Re, as shown in Figure 7.10. The friction factor of a porous rock is
equal to:
(7.1 17)
where the subscript pr stands for porous rocks, and
g, = conversion factor, 32.17 Ibm - ft/(lbf)(s2).
p = fluid density, lbm/f~~
p = pressure, lbf/ft2.
A = cross-sectional area, ft2.
P = turbulence factor, ft-' .
L = length of flow, ft.
qm = mass flow rate, lb,/s.
fpr = friction factor, dimensionless.
