Environmental Engineering Reference
In-Depth Information
Fig. 4.4
Gas/liquid flow regimes. Courtesy Schlumberger. Reprinted by permission of the SPE-
AIME from Ros (1961)
Holdup
The concept of two (or more) phases moving together up a pipe, but each with its
own velocity, leads to the concept of
holdup
. To understand holdup, it is vital to bear
in mind that in an oil-water mix, for example, the oil travels up the pipe faster than
the water. This has a remarkable effect on production logging tools that measure
fluid density.
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