Inductive Pressure Sensor Using Ferromagnetic Elastomer
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Solution Overview
Problem
Existing pressure monitoring devices for downhole conditions in wells face challenges in accurately measuring pressure due to harsh environmental conditions, such as temperature and pressure variations, which affect their reliability and precision.
Innovation Solution
A pressure sensing system utilizing a shaped elastomer with ferromagnetic material embedded as discrete particles, where the percentage by weight of ferromagnetic particles is selected to vary the inductance of the elastomer for a given compression, allowing for precise pressure measurement through electromagnetic energy modulation and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure monitoring devices are used in downhole conditions, then pressure measurement is performed, but measurement precision deteriorates due to harsh environmental conditions such as temperature and pressure variations
Solution Approach 1:
The patent replaces conventional mechanical pressure sensing elements with an inductive sensing system. The inductive element converts pressure-induced mechanical compression into electrical inductance changes, which are then converted to frequency shifts in reflected electromagnetic signals. This substitution eliminates the direct mechanical exposure issues that plague conventional pressure sensors in harsh downhole environments, while maintaining measurement precision through the electromagnetic field-based sensing mechanism.
Solution Approach 2:
The patent utilizes changes in the physical parameters of the inductive element (specifically inductance) in response to pressure-induced compression. The inductive element's inductance parameter changes predictably with compression, and this parameter change is transduced into a frequency shift that can be precisely measured. This parameter-based sensing approach maintains measurement precision while being inherently more resistant to harsh environmental conditions than mechanical sensors.
2Measurement precision
If the inductive element is compressed by pressure, then inductance changes to indicate pressure value, but the sensitivity may vary under different environmental conditions
Solution Approach 1:
The patent employs a dynamic sensing mechanism where the inductive element's electrical properties change in response to mechanical compression. The inductance change is directly proportional to the compression amount, creating a dynamic but predictable relationship between pressure and electrical signal. This dynamic response maintains consistent sensitivity across different environmental conditions because it relies on fundamental electromagnetic principles rather than fixed mechanical properties that may drift with temperature and pressure variations.
Solution Approach 2:
By replacing mechanical pressure measurement with electromagnetic inductive sensing, the system achieves more consistent sensitivity across varying environmental conditions. The electromagnetic field interaction is less susceptible to temperature and pressure drift than mechanical sensor properties, thereby improving adaptability while maintaining measurement precision through the reliable inductance-frequency relationship.
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
The system effectively correlates the inductance change of the elastomer with pressure values, providing accurate and reliable pressure monitoring in harsh downhole environments, with the ability to withstand high temperatures and maintain sensitivity across varying conditions.
Implementation Method 1
an inductance of the shaped elastomer will vary a predetermined amount for a given compression of the shaped elastomer
Implementation Method 2
ferromagnetic material embedded as discrete particles within the shaped elastomer
Implementation Method 3
reflect the electromagnetic energy at a ring frequency determined by an inductance of the transducer
Data Source
AI summary
Exemplary systems and method are directed to a sensing device, and to a pressure sensing system and method. An exemplary method includes supplying electromagnetic energy to a transducer which is configured to reflect the electromagnetic energy at a ring frequency determined by an inductance of the transducer, wherein the inductance changes in response to compression of the inductive element. The ring frequency of electromagnetic energy reflected by the transducer is correlated to a pressure value.