Downhole Motor Stator with Multi-Layer Protection
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Solution Overview
Problem
Artificial lift systems in wells often fail due to electrical system failures, leading to costly workover procedures and lost production, as these systems are exposed to hostile downhole environments and integrate electrical components with rotating and non-rotating parts, reducing reliability.
Innovation Solution
A downhole-type motor system with a stator and rotor design, where the stator includes layers to resist erosion and corrosion, and a magnetic bearing to control rotor position, allowing for separation of electrical components from hostile environments, enabling retrievable rotor components and improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrical components are integrated with rotating and non-rotating parts in downhole artificial lift systems, then the system can function as a complete artificial lift solution, but the reliability decreases due to exposure to hostile downhole environments
Solution Approach 1:
The artificial lift system is divided into separate functional modules: the motor stack with electrical components is separated from the pump assembly with rotating parts. This segmentation allows each component to be optimized for its specific environment and failure modes, improving overall system reliability while maintaining complete functionality.
Solution Approach 2:
The electrical components (motor stack) are extracted from the hostile downhole environment and positioned in a protected location. The motor stack is separated from the pump assembly, allowing the electrical components to be shielded from direct exposure to corrosive production fluids and high-temperature wellbore conditions.
2Ease of manufacture
If equipment failure occurs in downhole artificial lift systems, then workover procedures are required to replace failed components, but this results in lost production and increased costs
Solution Approach 1:
Different parts of the system have different levels of protection and accessibility. The motor stack is designed with localized protection features and can be independently replaced without requiring complete system withdrawal. This allows for targeted maintenance of specific components while maintaining production from other well sections.
Solution Approach 2:
The modular design enables selective replacement of failed components (such as the motor stack or pump assembly) while recovering and retaining functional components. This reduces the frequency and cost of workover procedures compared to complete system replacement.
3Reliability
If the stator uses multiple layers to resist erosion and corrosion, then the reliability improves, but the device complexity increases
Solution Approach 1:
The stator incorporates a composite structure with multiple layers having different material properties: an inner erosion-resistant layer, a middle corrosion-resistant layer, and an outer structural support layer. This composite construction provides enhanced durability against multiple degradation mechanisms while distributing the functional requirements across specialized layers.
Solution Approach 2:
Different regions of the stator have different protective characteristics tailored to their specific exposure conditions. The multi-layer construction provides localized protection where needed most, with each layer optimized for its specific function rather than using a single uniform material throughout.
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 solution increases production reliability, reduces workover costs, and minimizes periods of lost production by isolating electrical components from harsh environments, enhancing the overall efficiency and longevity of well operations.
Implementation Method 1
The first layer is configured to resist erosion
Implementation Method 2
The second layer is configured to resist corrosion
Implementation Method 3
The second layer is configured to isolate production fluid flowing through the inner bore of the housing from the dielectric fluid flooding the inner volume
Implementation Method 4
The magnetic bearing can be configured to control a position of the rotor relative to the stator during rotation of the rotor
Implementation Method 5
The motor stack is configured to drive the rotor that is disposed within the inner bore of the housing
Data Source
AI summary
A stator for a downhole-type motor includes a housing. The housing includes a sleeve. The sleeve includes a first layer, a second layer, and a third layer. The first layer is erosion-resistant. The second layer is corrosion-resistant. The third layer can provide structural support. The stator includes a motor stack. The stator can be used to drive a rotor disposed within an inner bore of the housing.