Elastomer-Coated MEMS Sensors for Wellbore Monitoring
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Solution Overview
Problem
Existing methods for monitoring the integrity and condition of wellbore servicing compositions, such as cement, in subterranean wells face challenges due to environmental damage and electromagnetic noise, and require continuous power for active sensors, limiting their effectiveness and lifespan.
Innovation Solution
Incorporating Micro-Electro-Mechanical System (MEMS) sensors coated with an elastomer into wellbore servicing compositions to detect parameters like compression, swelling, and density changes, allowing for passive monitoring of sealant integrity and location without the need for continuous power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active electronic sensors are embedded within cement, then real-time monitoring of sealant integrity is achieved, but the sensors are damaged by the highly alkali environment and electromagnetic noise
Solution Approach 1:
The patent introduces an elastomer coating as an intermediary layer between the sensor and the cement environment. This elastomer layer acts as a protective barrier that isolates the sensor from direct contact with the highly alkali cement, preventing chemical damage while allowing the sensor to detect changes in the cement matrix through mechanical coupling.
2Duration of action of moving object
If active sensors with internal batteries are used, then continuous monitoring capability is provided, but sensor size increases and useful life decreases
Solution Approach 1:
The patent employs passive sensors that do not require internal power sources. These sensors utilize the ambient electromagnetic field from external sources to induce current in the conductive elastomer coating, enabling signal generation without batteries. This self-service approach eliminates the weight and volume constraints of power supplies while extending operational life.
3Reliability
If passive sensors are used, then sensor size is reduced and alkali resistance is improved, but the sensors are sensitive to electromagnetic noise
Solution Approach 1:
The patent transforms the harmful effect of electromagnetic noise into a useful signal generation mechanism. The conductive elastomer coating acts as an antenna that converts ambient electromagnetic fields into detectable electrical signals. By designing the sensor to respond to electromagnetic induction, the system converts potential interference into the operating principle, enabling passive operation while maintaining sensitivity to cement matrix changes.
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 prolonged monitoring of wellbore servicing compositions, providing real-time data on sealant integrity and condition over the service life, reducing maintenance costs and enhancing the longevity of well operations.
Implementation Method 1
the sensor is coated with an elastomer. The elastomer-coated sensor is configured and operable to detect one or more parameters, including a compression or swelling of the elastomer, an expansion of the elastomer, or a change in density of the composition
Data Source
AI summary
A method comprising placing a composition comprising a wellbore servicing fluid and a Micro-Electro-Mechanical System (MEMS) sensor in a subterranean formation, whereby the MEMS sensor is coated with an elastomer. The elastomer-coated MEMS sensor is used to detect one or more parameters, including a compression or swelling of the elastomer, an expansion of the elastomer, or a change in density of the composition.