Fluid Identification - Cased-Hole Log Analysis and Reservoir Performance Monitoring - page 100

Other Measurements
The use of temperature logs to detect which type of fluid is flowing is covered in
Chap. 8 . The use of sibilation or noise logs is covered in Chap. 9 . These logs are
mentioned here to assure that they are remembered in the correct perspective as
fluid-identifying devices.
Many service companies offer tools that combine numerous sensors in one tool
string. This simplifies the practical problem of obtaining logs when working against
wellhead pressure with a riser and pressure-control equipment, since all the required
measurements can be made on one trip in the hole without time delays caused by
frequent tool changes. A schematic of such a combination tool is given in Fig. 7.19
and an example log is shown in Fig. 7.20 .
Fig. 7.19 The production
logging tool (PLT). Courtesy
Schlumberger