Downhole Seal Apparatus with Stiff Support for High-Pressure Isolation
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Solution Overview
Problem
In wellbores, existing seal technologies face challenges in providing effective isolation and sealing while withstanding high pressures and debris, often resulting in seal damage and leakage, especially in multi-zone wellbore applications where precise fluid control is necessary.
Innovation Solution
A seal apparatus comprising a seal housing, a seal member bonded to the housing, and a stiffer seal support, where the seal support extends across a seal gap in response to an energizing force, preventing seal member extrusion and damage, and allowing for high-pressure and high-debris environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal member is used to provide isolation in high-pressure wellbores, then fluid sealing capability is improved, but the seal member is susceptible to damage and extrusion under high pressure and debris
Solution Approach 1:
The seal assembly combines a seal member made of elastomeric material with a seal support made of stiffer material (such as PEEK or aramid fiber-reinforced plastic). This composite structure allows the elastomeric seal member to provide effective fluid sealing while the stiffer seal support prevents extrusion and damage under high pressure and debris conditions.
2Ease of operation
If the seal housing is spaced apart from the mandrel to form a seal gap, then installation and operation flexibility is improved, but the seal member is more vulnerable to pressure-induced extrusion
Solution Approach 1:
The seal support acts as an intermediary between the seal member and the high-pressure environment. It is positioned within the seal gap to provide mechanical support and protection to the seal member, preventing direct exposure to extrusion forces while maintaining the operational flexibility provided by the seal gap.
3Ease of manufacture
If a single-material seal structure is used, then manufacturing simplicity is improved, but the seal cannot simultaneously provide flexibility for sealing and stiffness for pressure resistance
Solution Approach 1:
The invention employs composite materials where the seal member is made of elastomeric material providing flexibility and sealing capability, while the seal support is made of stiffer material providing structural support and extrusion resistance. This composite approach enables a single seal assembly to perform both sealing and structural functions effectively.
4Stability of the object's composition
If the seal support is made from the same material as the seal member, then material consistency is improved, but the seal support cannot effectively prevent extrusion under high pressure
Solution Approach 1:
The invention applies local quality by using different materials for different components within the seal assembly. The seal member uses elastomeric material optimized for sealing contact, while the seal support uses stiffer material optimized for structural support. Each component's material properties are tailored to its specific function, creating a locally optimized structure.
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 provides a reliable, leak-proof seal that maintains integrity under high pressure and load conditions, preventing seal damage and ensuring effective fluid isolation in multi-zone wellbore operations.
Implementation Method 1
a seal member disposed between the seal housing and the mandrel, wherein the seal member is bonded to the seal housing
Implementation Method 2
a seal support disposed between the seal housing and the mandrel, wherein the seal support is formed from a second material, wherein the second material is stiffer than the first material, and the seal support extends across the seal gap in response to an energizing force applied to the seal support
Data Source
AI summary
In one aspect, a seal apparatus for use with a mandrel is disclosed that in one non-limiting embodiment contains a seal housing disposed about the mandrel, wherein the seal housing is spaced apart from the mandrel to form a seal gap, a seal member disposed between the seal housing and the mandrel, wherein the seal member is bonded to the seal housing and the seal member is formed from a first material, and a seal support disposed between the seal housing and the mandrel, wherein the seal support is formed from a second material, wherein the second material is stiffer than the first material, and the seal support extends across the seal gap in response to an energizing force applied to the seal support.