High-Pressure Plug Sealing With Fluid-Assisted Secondary Metal Seal
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Solution Overview
Problem
High pressure valves relying solely on metal-to-metal sealing mechanisms are unreliable due to changing tolerances, environmental impacts, and debris, which compromise the sealing ability over time.
Innovation Solution
A high-pressure plug design featuring bi-directional floating ball valves with sealing grooves that form a secondary seal using pressurized fluids to create a metal-to-metal seal against fixed inserts, incorporating grease flow paths to maintain a secondary seal and protect against debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a metal-to-metal sealing mechanism is used in high pressure valves, then the valve can operate at high pressures, but the sealing reliability deteriorates over time due to changing tolerances, environmental impacts, and debris
Solution Approach 1:
The patent introduces a fluid intermediary (water or other liquids) between the sealing surfaces to create a hydrodynamic seal. This fluid layer acts as a mediator that compensates for tolerance variations and protects the metal surfaces from direct contact with debris, thereby maintaining sealing reliability under high pressure conditions without the degradation issues of direct metal-to-metal contact
Solution Approach 2:
The patent employs hydraulic sealing principles by using pressurized fluid to maintain the seal. The fluid pressure creates a hydrodynamic effect that ensures continuous contact between the sealing surfaces while allowing for tolerance variations, and the fluid itself forms a protective barrier against environmental contaminants and debris
2Adaptability or versatility
If a floating barrier design is used to allow bi-directional sealing, then the valve can seal in both directions, but the barrier moves under upstream forces exposing the valve body to sand and chemicals
Solution Approach 1:
The fluid seal acts as an intermediary barrier between the moving floating barrier and the harmful external environment. This fluid layer protects the valve body and internal components from sand and chemicals while still allowing the barrier to move freely for bi-directional sealing operation
Solution Approach 2:
The patent creates an inert protective environment using the fluid seal that isolates the valve body internal surfaces from harmful external factors like sand and chemicals. This fluid barrier effectively creates a protected zone that allows the floating barrier to move without exposing sensitive components to contaminants
3Duration of action of stationary object
If grease flow paths are added to provide continuous lubrication, then the sealing durability is improved, but the device complexity increases
Solution Approach 1:
The grease flow path system is designed to be self-service, where the valve operation itself drives the grease circulation. The movement of the floating barrier and pressure differential during normal valve operation automatically pumps grease through the sealing surfaces, eliminating the need for external lubrication systems or additional actuation mechanisms
Solution Approach 2:
The grease flow paths are merged with the existing valve structure and sealing geometry. The lubrication system is integrated into the sealing surfaces and valve body design, combining the sealing and lubrication functions into a unified structure rather than adding separate, complex lubrication mechanisms
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
Enhances sealing reliability, durability, and operational efficiency by minimizing tolerance issues and reducing maintenance costs through continuous grease lubrication during fracturing operations without interrupting the process.
Implementation Method 1
receive pressurized fluids to form a secondary seal against the fixed insert
Implementation Method 2
grease the sealing surfaces of the plug and the insert
Data Source
AI summary
A bi-directional floating plug that utilize pressure from fracturing, wirelines, etc. to set a metal to metal seal against a fixed insert within a valve body