Downhole Barrier Boost System for Sealing Reliability
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Solution Overview
Problem
Conventional downhole barriers in subterranean wells face challenges in maintaining sealing capability under fluctuating differential pressures and temperatures, leading to potential leaks and compromised well operations.
Innovation Solution
A boost system with a boost housing and piston arrangement that applies compressive forces to the seal element in response to pressure differentials from both uphole and downhole directions, using a unidirectional body lock ring to trap the boost force and maintain sealing engagement, ensuring equal or differential boost areas for enhanced sealing capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional downhole barriers use basic seal elements without boost systems, then the device complexity is reduced, but the sealing reliability under fluctuating pressure conditions deteriorates
Solution Approach 1:
The boost system is divided into separate functional components: a boost housing containing a piston, fluid chambers for pressure differential response, and a unidirectional body lock ring mechanism. This segmentation allows each component to perform its specific function independently while maintaining overall system reliability without excessive complexity.
Solution Approach 2:
The seal element compression force is made dynamic rather than static. The boost system automatically adjusts the compressive force on the seal element in response to pressure differentials from either uphole or downhole directions, allowing the sealing capability to adapt to fluctuating well conditions and maintain reliability.
2Reliability
If the seal element is compressed between gage rings with fixed positioning, then the device complexity is minimized, but the sealing capability under varying pressure and temperature conditions deteriorates
Solution Approach 1:
The boost system incorporates a feedback mechanism where pressure differentials detected in the fluid chambers automatically trigger piston movement, which in turn adjusts the seal element compression force. This closed-loop feedback ensures the sealing capability adapts to changing pressure and temperature conditions without requiring external intervention.
Solution Approach 2:
The system is self-regulating through the unidirectional body lock ring and piston mechanism that automatically responds to pressure differentials. The boost system serves itself by using the well's own pressure differentials as the actuating force, eliminating the need for external control systems and enhancing adaptability to varying conditions.
3Adaptability or versatility
If boost areas are made unequal to provide differential boost forces, then the adaptability to different pressure directions is improved, but the device complexity increases
Solution Approach 1:
The boost housing is designed with asymmetric boost areas that are unequal in size. This asymmetry allows the system to provide different boost forces in response to pressure differentials from uphole versus downhole directions, enhancing adaptability to various well conditions while maintaining a relatively simple mechanical 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 system maintains the seal element's sealing capability across varying pressure conditions, providing equal pressure differential ratings for both directions and preventing excessive boost forces, thus ensuring reliable well operations.
Implementation Method 1
a piston in the boost housing separating first and second fluid chambers in the boost housing. The first fluid chamber is in fluid communication with an interior flow passage of a mandrel, and the second fluid chamber is in fluid communication with an exterior of the downhole barrier
Implementation Method 2
a seal element disposed around the mandrel and engageable with an exterior surface. A compressive force deforms the seal element radially outward to engage the exterior surface
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
A downhole barrier can include a housing disposed between a slip and a seal element, a mandrel extending through the housing and the seal element, and a piston fixed to the mandrel and separating two chambers in the housing. One chamber is positioned between the slip and the other chamber, and is in communication with a passage in the mandrel. The other chamber is in communication with an exterior of the barrier. A system can include a downhole barrier set in a wellbore. The barrier can include a housing disposed between a slip and a seal element, a mandrel, and a piston fixed to the mandrel, the piston separating two chambers in the housing. An outer area of the mandrel in one chamber is equal to twice a difference between an inner area of the housing and an outer area of the mandrel in the other chamber.