Fluid Identification - Cased-Hole Log Analysis and Reservoir Performance Monitoring - page 94

Fig. 7.10 Capacitance
watercut meter
Fig. 7.11 Capacitance array tool. Courtesy GE Oil & Gas, 2014
An array of 12 capacitance sensors mounted inside a set of collapsible bow
springs. The 12 measurements can be transmitted simultaneously to the surface or
recorded on a memory package. The measurements are taken in a single plane
across the diameter of the wellbore and allow for cross-sectional plot of fluid phases,
as shown in Fig. 7.12 .
Fluid Resistivity Measurements
Cross-sectional water holdup profiling and 3D imaging of water holdup is possible
by use of the resistivity array tool as illustrated in Fig. 7.13 . The tool relies on the
resistivity contrast between water and hydrocarbons but is unable to distinguish
between oil and gas.