Staging Tool Seal Protection via Retractable Sleeve
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Solution Overview
Problem
Current staging tool designs for gas well production face issues with elastomeric seal damage during extraction, leading to potential equipment damage and costly maintenance due to the seals' tendency to 'set' and not return to their original shape after force removal.
Innovation Solution
A cylindrical sleeve is used to protect the elastomeric seal by sliding over it, expanding to contact the tubing wall for sealing during deployment and retracting to enclose the seal during extraction, preventing damage and ensuring the seal remains protected from the tubing wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a retractable elastomeric seal is used in the staging tool, then the seal can be expanded to contact the tubing wall for sealing during deployment, but the seal tends to 'set' and not return to its original shape after force removal, causing damage during extraction
Solution Approach 1:
A protective sleeve is introduced as an intermediary component between the elastomeric seal and the tubing wall. The sleeve slides over the seal during deployment and extraction, preventing direct contact between the seal and tubing wall. This mediator protects the seal from damage while allowing the seal to perform its sealing function when needed.
Solution Approach 2:
The sealing system is divided into separate functional components: the elastomeric seal for creating the seal, the protective sleeve for preventing damage, and the tapered shaft for applying force. This segmentation allows each component to perform its specific function without interfering with others, solving the contradiction between sealing capability and durability.
2Ease of operation
If the elastomeric seal is exposed to the tubing wall during tool extraction, then the tool can be easily extracted, but the seal becomes prone to damage and requires maintenance
Solution Approach 1:
The protective sleeve acts as a mediator that allows easy extraction of the tool while preventing seal damage. The sleeve slides freely during extraction, enabling easy removal, but simultaneously protects the seal from contact with the tubing wall that would cause damage and require maintenance.
3Reliability
If the elastomeric seal is protected from the tubing wall during extraction, then seal damage is prevented, but the seal cannot be easily accessed for maintenance when needed
Solution Approach 1:
The protective sleeve can be extracted or removed from the staging tool, exposing the elastomeric seal for maintenance. This allows the seal to be protected during operation but easily accessed when maintenance is needed, resolving the contradiction between protection and accessibility.
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
This solution effectively prevents elastomeric seal damage during tool extraction, reducing maintenance needs and avoiding equipment damage, thus minimizing downtime and maintenance costs.
Implementation Method 1
an elastomeric seal which is expanded when the device is set in the well by means of a tapered shaft forcing the bushing against the tubing wall
Implementation Method 2
Upon extraction, the tapered shaft is removed from the elastomeric bushing allowing it to collapse away from the tubing wall
Data Source
AI summary
A staging tool arrangement for gas well production assistance, comprising an elongated staging tool having an elongated upper portion and an elongated lower portion. The upper portion has a sliding relationship with the lower portion thereof. A displaceable annular seal is arranged about the lower portion. A displaceable enclosure is arranged on the elongated lower portion so as to slidably expose and to slidably enclose the annular seal.