Resistitivy measurement for evaluating a fluid
AssigneeSchlumberger Technology Corporation
InventorsDominique Benimeli, Christian Chouzenoux, Yann Dufour
Life of this patent
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Abstract
A technique facilitates evaluation of a fluid flowing through a tubing and includes at least one sensor deployed along an interior of the tubing. Each sensor comprises a plurality of electrodes and insulation material disposed between the electrodes to isolate the electrodes from each other and to facilitate resistivity measurements. The plurality of electrodes comprises electrodes for emitting an electric current and for monitoring voltage so as to enable resistivity measurements with respect to fluid flowing through the tubing. The resistivity measurements may be used to determine a constituent fraction, e.g. a water fraction, of the fluid flowing through the tubing.
Claims20
A method for determining a constituent of a fluid, comprising:
- providing a sensor with a plurality of electrodes separated by insulation, the plurality of electrodes comprising current emitting electrodes and monitoring electrodes;
- using at least one current emitting electrode to inject an electric current into a fluid proximate the sensor;
- dynamically adjusting the electric current injected into the fluid to maintain the monitoring electrodes at approximately the same voltage;
- operating the sensor along an inside wall of a tubing as the fluid passes through the tubing;
- and
- determining a water fraction in the fluid by controlling and monitoring the electric currents injected and the voltages sensed via the plurality of electrodes.
A method, comprising:
- deploying a plurality of electrodes along an interior of a tubing;
- providing insulation between electrodes of the plurality of electrodes;
- flowing a fluid through the tubing;
- obtaining resistivity measurements of the fluid by injecting current and monitoring voltage via electrodes of the plurality of electrodes;
- and
- determining a water fraction in the fluid via the resistivity measurements.
A system for determining water fraction, comprising:
- a well string having a production tubing;
- and
- a sensor deployed along an interior of the production tubing, the sensor comprising:
- a plurality of electrodes including electrodes for emitting electric current and electrodes for monitoring voltage;
- and
- insulation disposed to electrically isolate each electrode of the plurality of electrodes from the other electrodes of the plurality of electrodes.
Dependencies are inferred from the claim text.