Plunger Assembly Dampening System for Impact Reduction
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Solution Overview
Problem
Conventional plunger lift systems face issues with high impact forces during operation, inability to adapt to varying well flow rates, and inefficiencies due to the 'drift diameter' constraint, leading to tool damage and leakage, which affects the pressure gradient and accelerates wear from particulates.
Innovation Solution
A plunger assembly with an internal dampening system that includes a hollowed rigid outer body, a dart with a central channel, and an optional expandable seal, which minimizes impact forces through a restricted diameter section and wear pads, allowing operation across different flow rates and reducing abrasion by directing fluid flow centrally and using an expandable seal to prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional plunger lift systems are used, then the plunger can remove contaminants and water from the well, but high impact forces are generated on the tool and equipment upon impact at the bottom of the well, causing tool damage
Solution Approach 1:
The patent applies beforehand cushioning by incorporating a dampening system with springs and shock-absorbing elements into the plunger assembly before it descends the well. This system is pre-configured to absorb and dissipate the impact forces generated when the plunger reaches the bottom of the well, thereby protecting the tool and equipment from damage while maintaining the plunger's ability to effectively remove contaminants and water.
2Productivity
If the plunger is designed to fall quickly in low flowing wells, then the tool can clear the well efficiently, but the tool may fall too fast and incur damage upon impact at the bottom
Solution Approach 1:
The dampening system is pre-installed in the plunger assembly to cushion the impact before it occurs. This allows the plunger to maintain high descent speeds for efficient well clearing in low flowing conditions while the shock-absorbing elements protect the tool from damage upon reaching the bottom.
Solution Approach 2:
The patent employs dynamic elements such as springs and movable dampening components that can adjust to varying descent speeds. These dynamic elements allow the plunger to fall quickly when needed while automatically activating the dampening mechanism to protect against impact damage, adapting the system's behavior to the operational conditions.
3Productivity
If the plunger diameter is maximized to reduce the annulus gap, then the pressure gradient efficiency improves, but the tool cannot pass through the drift diameter of the tubing
Solution Approach 1:
The patent utilizes flexible seals and expandable elements that can conform to the tubing inner diameter. These flexible components allow the plunger to maintain a larger effective diameter for improved pressure gradient efficiency while still passing through the drift diameter of the tubing, as the flexible elements can compress or expand as needed.
Solution Approach 2:
The plunger incorporates dynamic sizing capabilities through expandable or collapsible sections that can adjust the tool's diameter. When passing through the drift diameter, the tool contracts to a smaller profile; once positioned, it expands to maximize the pressure gradient efficiency, thus resolving the contradiction between size constraints and performance requirements.
4Adaptability or versatility
If the plunger allows high fluid flow through the tool, then the tool can operate in high flowing wells, but the working fluid passes through the gap at increased speeds causing rapid abrasion from particulates
Solution Approach 1:
The patent extracts the fluid flow path from the annular gap between the plunger and tubing by incorporating internal flow channels and restrictions within the plunger body. This redirects the high-velocity fluid flow away from the gap, preventing particulates in the working fluid from causing rapid abrasion on the plunger surface while still allowing the tool to adapt to various flow rates.
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 internal dampening system reduces tool damage and wear, enables efficient operation across varying flow rates, and prevents leakage by dispersing impact forces and maintaining a stable pressure gradient, thereby enhancing the longevity and efficiency of the plunger assembly.
Implementation Method 1
an internal dampening system that reduces tool damage and wear by dispersing impact forces
Implementation Method 2
wear pads, allowing operation across different flow rates and reducing abrasion
Implementation Method 3
an optional expandable seal, which minimizes impact forces through a restricted diameter section and wear pads, allowing operation across different flow rates and reducing abrasion by directing fluid flow centrally and using an expandable seal to prevent leakage
Implementation Method 4
a dart with a central channel, and an optional expandable seal, which minimizes impact forces through a restricted diameter section
Data Source
AI summary
The present application includes and assembly having a rigid hollowed body and an internal dart configured to traverse the length of a well bore and remove contaminants. The body having a central channel for accepting the dart. The dart includes a central passage and an exit port to selectively permit the passage of working fluid around and through the dart. The dart is configured to transition between an extended position and a seated position. The body includes one or more restricted diameter sections to create a dampener effect to minimize and distribute the impact forces upon the assembly. The assembly optionally includes one or more external wear pads, and an expandable seal coupled to the body configured to expand in diameter from the increase in pressure in the well bore. The expandable seal contacts the walls as the assembly rises in the well.