Patent ID: 9116105
Filing Date: 2015-08-25
Classification: E21B,G01N

Abstract:
1. A sensor for measuring water fraction in a fluid mixture, wherein the sensor comprises: an active probe having a first electrode and a second electrode extending inwardly from a wall forming a conductive tubing through which the fluid mixture flows in a borehole, the first electrode and the second electrode being isolated from each other by a first insulating layer, the second electrode being positioned around the first electrode to provide an electric shielding over a portion of the first electrode, the first and second electrodes being in contact with the fluid mixture; a reference probe formed from an internal wall of the conductive tubing contacting the fluid mixture and isolated from the first electrode and the second electrode of the active probe by a second insulating layer; and an electronic unit coupled to the first and second electrodes, and to the reference probe, the electronic unit having a capacitance module for measuring a capacitance between the active probe and the reference probe.