Environmental Engineering Reference
In-Depth Information
The factors entering into calculation of flow rate are:
Casing ID
Tool OD
Time between peaks
Distance between the detectors
It is essential to remember that the speed of the fluid in the tool casing annulus is
greater than the speed of the fluid in the undisturbed wellbore. Thus,
detector spacing
time
q
=
´
area availablefor flow,
and
p
4
ë
(
)
-
(
2
)
2
û
area
=
Casing ID
Tool OD
In order to express flow rates in barrels per day, some constant is required, if detector
spacing, casing size, and tool OD are measured in inches and time is in seconds,
=
(
)
´8 905
BD cubicinchessecond
/
/
.
.
Fig. 6.2
The tracer ejector
tool. Courtesy Schlumberger
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