Multi-Frequency Electrical Impedance Tomography for Fluid Characterization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Determining fluid characteristics inside horizontal wells is challenging due to complex fluid flow dynamics, making it difficult to identify producing and non-producing stages.
Innovation Solution
A system using a set of electrodes and a signal generator to measure multi-frequency impedance characteristics of fluid inside a pipe by inducing voltage differences, allowing for the determination of fluid composition and flow regime through active integration of experimental data with multi-frequency electrical impedance tomography (MFEIT) modeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi-frequency impedance measurement is used to characterize fluid inside pipe, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system segments the measurement process by using multiple electrodes positioned at different locations along the pipe to measure impedance at multiple frequencies. This segmentation allows comprehensive fluid characterization while distributing the complexity across multiple simple measurement points rather than requiring a single complex measurement device.
Solution Approach 2:
The electrode system is designed to perform multiple functions: measuring impedance at various frequencies, characterizing different fluid properties (composition, flow regime), and monitoring fluid dynamics. This multi-functionality reduces the need for separate specialized devices for each measurement type, thereby managing device complexity while improving measurement precision.
2Measurement precision
If multiple electrodes are positioned at different locations along the pipe, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The pipe is segmented into multiple measurement zones with electrodes positioned at different locations. Each electrode pair provides localized impedance measurements, and the combination of these segmented measurements delivers comprehensive and precise fluid characterization throughout the entire pipe system.
Solution Approach 2:
The electrodes serve as intermediaries between the signal generator and the fluid, converting electrical signals into measurable impedance data. This intermediary approach simplifies the direct measurement challenge by using the electrodes as intermediate sensing elements that translate complex fluid properties into electrical measurements.
3Measurement precision
If multi-frequency signals are used to induce voltage difference, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The system uses multiple frequencies, but not all frequencies are applied simultaneously with equal power. Instead, the signal generator applies partial energy at each frequency or uses a sweep approach, providing sufficient measurement precision while avoiding excessive energy consumption that would result from continuous full-power multi-frequency application.
Solution Approach 2:
The multi-frequency signaling is implemented periodically or in a time-multiplexed manner rather than continuously. The signal generator cycles through different frequencies or applies them in periodic bursts, which maintains measurement precision by capturing impedance variations at multiple frequencies while significantly reducing overall energy consumption compared to continuous multi-frequency application.
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
Enables accurate characterization of fluid composition and flow regimes, enhancing the detection of hydrocarbon production zones and monitoring changes in fluid composition, thereby improving the identification of producing stages within horizontal wells.
Implementation Method 1
measure one or more impedance characteristics of fluid inside a pipe
Implementation Method 2
The multi-frequency measurement of the impedance characteristic(s) of the fluid inside the pipe may be obtained from the set of electrodes
Data Source
AI summary
A multi-frequency signal may be used to induce voltage difference across a portion of a pipe. The voltage difference may be induced to take multi-frequency measurement of impedance characteristics of fluid inside the pipe. The multi-frequency measurement of the impedance characteristic of the fluid inside the pipe may be used to determine a characteristic of the fluid inside the pipe. This may be achieved by active integration of experimental data with high-resolution multi-frequency electrical impedance tomography (MFEIT) modeling.