Locking Energizing Ring Seal for Downhole Integrity
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Solution Overview
Problem
Downhole sealing systems in oil and gas production face integrity issues due to pressure from below, which reduces the effectiveness of seals as they are driven out of engagement by upward forces, particularly in high-pressure environments.
Innovation Solution
The implementation of a U-shaped seal with locking features, including bumps and grooves on an energizing ring and the seal, which redirects upward forces into radial forces to maintain contact pressure between the seal and wellbore components, enhancing sealing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional seal is used in a downhole environment, then the seal can initially establish pressure barriers, but the seal integrity declines when subjected to upward pressure from below
Solution Approach 1:
The seal is divided into two legs (first leg and second leg) that can independently engage with respective wellbore components. This segmentation allows each leg to maintain engagement separately, preventing the entire seal from being pushed out by upward forces.
Solution Approach 2:
The locking features (bumps and grooves) convert the axial upward force into radial contact pressure. By redirecting the force vector from the axial dimension to the radial dimension, the seal maintains engagement while still allowing pressure to pass through the system.
2Stress or pressure
If an energizing ring is used to drive the seal legs radially outward, then contact pressure is generated, but upward forces can drive the energizing ring and seal out of engagement
Solution Approach 1:
The locking features utilize the harmful upward force to achieve a beneficial effect. The bumps on one component engage with grooves on the other, converting the upward axial force into increased radial contact pressure between the seal legs and wellbore components, thereby maintaining seal integrity under pressure.
3Reliability
If locking features are added to resist upward forces, then seal integrity is maintained, but device complexity increases
Solution Approach 1:
Rather than redesigning the entire seal system, locking features are added only at specific locations where engagement is critical. The bumps and grooves are positioned locally on the energizing ring and seal components, providing targeted reinforcement without requiring a complete system redesign.
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 effectively resists upward forces, maintaining seal integrity even in high-pressure environments by converting axial forces into radial forces that secure the seal components, thereby improving the sealing capabilities and reliability of the system.
Implementation Method 1
the bumps transmitting an uphole force into components having an axial component and a radial component
Data Source
AI summary
A system for forming a seal between wellbore components includes an annular seal having a first leg and a second leg, the first leg positioned proximate a first wellbore component and the second leg positioned proximate a second wellbore component, wherein upon activation of the seal, the first leg engages the first wellbore component and the second leg engages the second wellbore component. The system also includes an energizing ring adapted to activate the seal, the energizing ring extending into an opening of the seal to drive the first leg and the second leg radially outward relative to an axis of the seal. The energizing ring includes bumps positioned to align with respective grooves formed on both the first leg and the second leg, upon activation of the seal, the bumps transmitting an uphole force into components having an axial component and a radial component.