What Is Capacitance Water Holdup Tool?
The Netssu CWH (Capacitance Water Holdup Tool) measures the water volume fraction in fluid mixtures flowing in the borehole. It operates as part of an One-Line™ tool string and derives power and control from a suitable system controller e.g. MPL. Part of the fluid flow passes through the tool between the electrodes of a cylindrical capacitor. The capacitance measured depends on the dielectric constant and the distribution of the fluids between the electrodes. In well-mixed fluids, the tool has a linear response from zero to about 43% water volume fraction.