Page 496 - Petrophysics

464 PETROPHYSICS: RESERVOIR ROCK PROPERTIES

1 E-5 1 E-4 1 E-3 1 E-2

qm
Figure 7.11. Semilogplot of J(qm) us. massfzow rate.

If the value of Re,, obtained in Step 5 is greater than 8, the following
equation should be used to calculate a more accurate value of the
mass flow rate:

Equation 7.127 can be derived by substituting Equation 7.1 17 into
Equation 7.123, which corresponds to the so-called fully turbulent
flow regime.
If the Reynolds number obtained in Step 5 is in the range of 0.08,
repeat Steps 1 through 4 using the following expressions for the
function J(qm):

Equation 7.128 can be derived by substituting Equations 7.117 and
7.118 into Equation 7.125. The terms J1 and J2 are given by Equations
7.125a and 7.125b, respectively.

EXAMPLE

Calculate the mass flow rate for the core flow test in the example on
page 449 using the above procedure.