Boot Seal Retainer for ESP Motor Lead Sealing
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Solution Overview
Problem
Elastomeric boot seals in downhole equipment swell when exposed to dielectric oil, leading to gaps between the seals and conductors, which impairs their functionality and reduces the effective lifetime of the motor.
Innovation Solution
An annular boot seal retainer made of a material that does not expand with dielectric oil is used to prevent dimensional changes in the elastomeric boot seals, maintaining a snug fit around the insulated conductors and preventing gaps from forming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomeric boot seals are used to seal around motor leads, then sealing effectiveness is improved, but the seals swell when exposed to dielectric oil causing gaps to form between the seals and conductors
Solution Approach 1:
A boot seal retainer made of oil-resistant material (such as PTFE, polypropylene, or nylon) is introduced as an intermediary component between the elastomeric boot seal and the motor lead. The retainer maintains the sealing function while being immune to dielectric oil swelling, thus preventing gap formation between the seal and conductor.
Solution Approach 2:
The sealing system uses a composite structure combining elastomeric material (for sealing compliance) with oil-resistant polymer material (for dimensional stability). The elastomeric boot seal provides the sealing interface while the retainer made of composite material resists oil-induced swelling, creating a hybrid solution that leverages the advantages of both material types.
2Reliability
If elastomeric boot seals are used around motor leads, then sealing around conductors is achieved, but gaps form between the seals and conductors due to swelling in dielectric oil at high temperatures
Solution Approach 1:
The boot seal retainer serves as a mediator that maintains the precise fit between the elastomeric seal and the motor lead. It prevents the seal from swelling outward due to dielectric oil exposure, thereby preserving the manufacturing precision of the seal-conductor interface even under high temperature and oil exposure conditions.
3Ease of operation
If elastomeric material is used for boot seals, then flexibility and sealing capability are improved, but the material expands when exposed to dielectric oil leading to gap formation
Solution Approach 1:
The sealing system is segmented into two functional components: the elastomeric boot seal that provides flexibility and sealing capability, and the boot seal retainer that provides dimensional stability and resistance to oil-induced expansion. Each component is optimized for its specific function, allowing the system to achieve both flexibility and stability.
Solution Approach 2:
The solution employs composite materials by combining elastomeric polymer (for flexibility and sealing) with oil-resistant polymer materials such as PTFE, polypropylene, or nylon (for dimensional stability). This composite approach allows each material to perform its optimal function without the drawbacks of the other.
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 boot seal retainer constrains the expansion of the elastomeric material, preventing gaps and debris entry, thus enhancing the sealing effectiveness and extending the motor's lifespan by maintaining a secure seal despite exposure to high temperatures and dielectric oil.
Implementation Method 1
the elastomeric material of the seal may swell, but the boot seal retainer will provide hoop strength that prevents the inner diameter of the boot seal from expanding
Implementation Method 2
the boot seal retainer will provide hoop strength that prevents the inner diameter of the boot seal from expanding and leaving a gap
Data Source
AI summary
Systems and methods for providing seals around the motor leads and other conductors in ESP's. In one embodiment, elastomeric boot seals are positioned within annular spaces around motor leads in an ESP motor. When the motor is filled with dielectric oil, the elastomeric material of the boot seals absorbs some of the oil and swells. High temperatures may also cause the material of the seals to expand. Retainers which are not subject to swelling are positioned around the boot seals, thereby preventing the boot seals from expanding away from the leads. The retainers thereby maintain the seal of the boot seals against the motor leads.