Downhole Fluid Sensor with Conductive Shield
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Solution Overview
Problem
Current downhole tools for formation evaluation lack effective sensors to accurately measure parameters of downhole fluids, which are essential for determining hydrocarbon presence and properties in subterranean formations.
Innovation Solution
A downhole fluid sensor with an insulative base, conductive shield, and non-conductive coated electrodes is deployed in the downhole tool, allowing for the measurement of fluid parameters by exposing the sensing elements to the fluid and connecting them to a downhole unit through pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrodes are exposed to downhole fluid for measurement, then measurement precision is improved, but electrical conductivity issues arise causing measurement errors
Solution Approach 1:
A non-conductive coating is applied to the electrodes before deployment, creating a protective barrier that prevents electrical conductivity issues with the downhole fluid while allowing the electrodes to remain exposed for measurement purposes
Solution Approach 2:
An insulative base and conductive shield are introduced as intermediary components between the electrodes and the downhole fluid environment, allowing electrical isolation while maintaining measurement capability through the flowline interface
2Reliability
If conductive shield is added to prevent electrical interference, then reliability is improved, but device complexity increases
Solution Approach 1:
The insulative base, conductive shield, and electrode assembly are combined into a single integrated sensor unit that can be positioned together in the flowline, reducing overall system complexity while maintaining electrical isolation functionality
Solution Approach 2:
The conductive shield serves multiple functions: providing electrical isolation, structural support for the electrode assembly, and defining the flowline interface, thereby reducing the need for separate components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables precise measurement of downhole fluid parameters, enhancing the accuracy of formation evaluation and hydrocarbon detection, while preventing electrical conductivity issues through insulative coatings and shields.
Implementation Method 1
a plurality of electrodes each having a non-conductive coating thereon
Implementation Method 2
Each of the electrodes includes a sensing element and a pin. The sensing element is positionable in the insulative base and exposed to the downhole fluid passing through the flowline
Data Source
AI summary
A fluid sensor for a downhole tool positionable in a wellbore penetrating a subterranean formation. The downhole tool has a housing with a flowline therethrough receiving a downhole fluid therein. The fluid sensor includes an insulative base positionable in the downhole tool, a conductive shield positionable on the insulative base, and a plurality of electrodes each having a non-conductive coating thereon. Each of the electrodes includes a sensing element and a pin. The sensing element is positionable in the insulative base and exposed to the downhole fluid passing through the flowline. The pin operatively connects the sensing element to a downhole unit whereby parameters of the downhole fluid are measured.