Magnetically Shielded MEMS Gyroscope for Downhole Navigation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In oilfield exploration, inductive-type MEMS gyroscopes face challenges due to magnetic interference from steel casings, which can cause malfunctions in downhole drilling and navigation, necessitating effective magnetic shielding to ensure accurate angular measurement and navigation in harsh subterranean environments.
Innovation Solution
A magnetically shielded inductive-type MEMS gyroscope package is developed, featuring a housing with a magnetic shield of high-magnetic permeability materials like permalloy or μ-metal around the gyroscope, combined with a protective layer to prevent wear and enhance durability, allowing for reliable operation in magnetic interference-prone environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inductive-type MEMS gyroscopes are used in downhole tools, then angular measurement capability is provided, but magnetic interference from steel casings causes malfunctions and measurement errors
Solution Approach 1:
A magnetic shield made of high-permeability material is introduced as an intermediary component between the steel casing and the inductive-type MEMS gyroscope. This shield acts as a mediator that redirects magnetic field lines around the sensitive gyroscope components, preventing direct magnetic interference while allowing the gyroscope to function accurately in the downhole environment
2Object-affected harmful factors
If a magnetic shield is added around the gyroscope, then magnetic shielding is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The magnetic shield is implemented as a thin-walled cylindrical structure made of high-permeability material. This thin-film approach provides effective magnetic shielding while minimizing the addition of structural complexity and maintaining a compact form factor suitable for downhole tool integration
Solution Approach 2:
The magnetic shield serves multiple functions simultaneously: it provides magnetic shielding for the gyroscope, acts as a structural component of the housing, and can be integrated with other tool components. This multi-functionality reduces overall device complexity by combining multiple roles into a single element
3Object-affected harmful factors
If high-permeability magnetic shield material is used, then magnetic shielding effectiveness is improved, but susceptibility to wear and damage increases
Solution Approach 1:
The magnetic shield is constructed using composite material structures that combine high-permeability magnetic materials with wear-resistant coatings or protective layers. This composite approach maintains the magnetic shielding effectiveness of the high-permeability material while adding a protective outer layer that resists wear and mechanical damage in the harsh downhole environment
Solution Approach 2:
A protective coating or layer is applied to the magnetic shield material before deployment. This protective layer acts as a cushion or barrier that prevents direct contact between the vulnerable high-permeability material and abrasive or damaging elements in the downhole environment, thereby preventing wear and damage while preserving magnetic shielding functionality
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 magnetic shielding significantly reduces unwanted magnetic noise, ensuring accurate angular measurements and navigation, even in high-magnetic field conditions, thereby enhancing the reliability and precision of downhole tools in drilling and logging operations.
Implementation Method 1
a magnetic shield disposed around the inductive-type MEMS gyroscope to magnetically shield the inductive-type MEMS gyroscope
Implementation Method 2
a magnetic shield of high-magnetic permeability materials like permalloy or μ-metal around the gyroscope
Data Source
AI summary
A gyroscope package, system and method for use in a downhole tool suitable are provided. The gyroscope package, system and method includes a housing coupleable with a downhole tool, a gyroscope body within the housing, and an inductive-type MEMS gyroscope. The MEMS gyroscope includes a magnetic shield disposed around the inductive-type MEMS gyroscope to magnetically shield the inductive-type MEMS gyroscope.