MEMS Shear Stress Sensors for Fluid Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional rheometers and viscometers used in the oil and gas industry for measuring drilling fluid viscosity are complex, expensive, and prone to mechanical failures, producing unreliable results and being sensitive to high pressures and temperatures, which limits their ability to simulate downhole conditions.
Innovation Solution
The use of micro-electro-mechanical system (MEMS) shear stress sensors in fluid analysis devices to directly measure shear stress, eliminating the need for mechanical torque sensing systems, simplifying design, enhancing accuracy, and allowing for more robust and cost-effective construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional mechanical torque sensing systems are used to measure viscosity, then the device can perform viscosity measurement, but the device becomes complex, expensive, and sensitive to high pressures and temperatures
Solution Approach 1:
The patent replaces the traditional mechanical torque sensing system with a MEMS-based shear stress sensor that uses micro-electromechanical systems to directly measure shear stress. This substitution eliminates complex mechanical components like torque transducers and bearing assemblies, reducing device complexity while maintaining measurement capability through direct shear stress measurement at the sensor interface
Solution Approach 2:
The patent extracts and removes the mechanical torque sensing subsystem from the rheometer design. By taking out the mechanical torque measurement mechanism and replacing it with a direct shear stress sensor, the design simplifies the overall system architecture and reduces the number of mechanical moving parts that could fail under high pressure and temperature conditions
2Measurement precision
If traditional mechanical torque sensing systems are used, then viscosity can be measured, but the devices are expensive and have multiple points of failure
Solution Approach 1:
The patent replaces mechanical torque sensing systems with a MEMS shear stress sensor that has fewer moving parts and no complex mechanical linkages. This substitution improves reliability by eliminating points of failure such as mechanical bearings and torque transducers that are sensitive to high pressure and temperature, while maintaining the ability to measure viscosity through direct shear stress detection
Solution Approach 2:
The patent employs a disposable or easily replaceable MEMS shear stress sensor that can be quickly exchanged if failed, rather than using expensive, complex mechanical torque sensing systems that are difficult to repair. This approach improves overall system reliability by allowing rapid replacement of sensors without requiring complex mechanical components that are costly and difficult to maintain
3Force
If mechanical torque sensing systems with specific bearing designs are used, then torque measurement can be achieved, but the bearings are difficult to build and repair
Solution Approach 1:
The patent replaces the mechanical bearing assembly and torque sensing mechanism with a MEMS-based direct shear stress measurement system. This substitution eliminates the need for precision bearing designs that are difficult to manufacture and repair, as the sensor directly measures shear stress without requiring complex mechanical support structures
Solution Approach 2:
The patent extracts and removes the bearing assembly from the system design. By taking out the mechanical bearing components that are difficult to manufacture and repair, the patent simplifies the overall device construction and eliminates the need for specialized bearing manufacturing and repair capabilities
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
Direct measurement of shear stress simplifies design, enhances accuracy, reduces construction complexity and costs, and enables simulation of downhole conditions, providing reliable viscosity measurements and models for improved drilling operations.
Implementation Method 1
The use of micro-electro-mechanical system (MEMS) shear stress sensors in fluid analysis devices to directly measure shear stress
Data Source
AI summary
In some examples, a fluid analysis device (FAD) comprises a fluid chamber comprising an agitator and a shear stress sensor exposed to a surface within the fluid chamber.