Water fraction measuring sensor and method having capacitance module

摘要

A sensor for measuring water fraction in a fluid mixture flowing in a conductive tubing within a borehole. The sensor comprises: an active probe, a reference probe, and an electronic unit. The active probe includes a first electrode and a second electrode isolated from each other by a first insulating layer, the first and second electrodes are preferably in contact with the fluid mixture. The reference probe is formed from an internal wall of the conductive tubing contacting the fluid mixture and isolated from the reference probe by a second insulating layer. The electronic unit is coupled to the first and second electrodes, and to the reference probe, the electronic unit preferably includes a capacitance module for measuring a capacitance between the active probe and the reference probe.

主权项

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.