Double-Acting Compounder for Coil Tubing Jarring
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Solution Overview
Problem
Conventional downhole tools face challenges in coil tubing applications due to limited compressive loads and space constraints, requiring a double-acting compounder that can efficiently store and release energy for jarring operations without straining the tubing string or increasing tool length.
Innovation Solution
A double-acting compounder design featuring a telescopically arranged inner mandrel and outer housing with a fluid chamber, sealed at both ends, and an equalizer to equalize pressure, allowing for compressive force buildup and release in both jarring directions, while maintaining a compact length and accommodating limited wall thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a double-acting compounder is designed to store and release energy for jarring operations in both directions, then the jarring force capability is improved, but the device complexity increases due to the need for telescopic inner mandrel and outer housing arrangement with fluid chamber
Solution Approach 1:
The patent employs a telescopic arrangement where the inner mandrel is nested within the outer housing, creating a compact double-acting compounder. The inner mandrel contains a fluid chamber that is sealed at both ends, allowing energy storage and release in both jarring directions without requiring separate mechanisms for each direction, thus improving force capability while managing device complexity through nested configuration
Solution Approach 2:
The movable seal assembly is designed to move between two positions, being movable with the inner mandrel in one direction while being restrained in the opposite direction. This dynamic configuration allows the seal assembly to adapt its position based on the direction of jarring force, enabling double-acting functionality where energy can be stored and released in both directions through the same fluid chamber
2Use of energy by moving object
If the fluid chamber is sealed at both ends to enable double-acting operation, then the energy storage capability is improved, but the device length increases
Solution Approach 1:
The telescopic nesting of the inner mandrel within the outer housing allows the fluid chamber to be sealed at both ends (uphole and downhole) without proportionally increasing the overall device length. The nested configuration enables the fluid chamber to extend along the telescopic path rather than requiring additional axial space, thus improving energy storage capability while managing device length
Solution Approach 2:
The patent utilizes the telescopic dimension to accommodate the sealed fluid chamber. By allowing the inner mandrel to telescope within the outer housing, the design transforms the spatial arrangement from a simple linear extension to a multi-dimensional configuration where the fluid chamber可以利用 the telescopic space, enabling double-acting operation without excessive length increase
3Productivity
If the movable seal assembly is designed to move with the inner mandrel in one direction but be restrained in the other direction, then the compounding efficiency is improved, but the manufacturing precision requirements increase for the shoulder contacts
Solution Approach 1:
The inner mandrel and outer housing are equipped with shoulders at specific locations to provide localized contact points for the movable seal assembly. The inner mandrel has a shoulder that contacts the seal assembly to move it with the mandrel during one direction of travel, while the outer housing has a shoulder that restrains the seal assembly during the opposite direction. This localized quality approach enables differentiated movement control at different positions, improving compounding efficiency while managing manufacturing precision requirements through targeted contact point design
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 enables effective energy storage and release for enhanced jarring force in both directions, ensuring efficient operation within the constraints of coil tubing applications, reducing the risk of tool collapse and extending seal life, while maintaining a compact and efficient design.
Implementation Method 1
the inner mandrel moves in a first direction relative to the outer housing to compresses fluid within the fluid chamber
Implementation Method 2
an equalizer between the fluid chamber and an exterior of the outer housing for equalizing pressure
Data Source
AI summary
A double-acting compounder comprises: an outer housing; an inner mandrel disposed telescopically within the outer housing to define a fluid chamber; an equalizer, such as an equalizer piston, between the fluid chamber and an exterior of the outer housing for equalizing pressure; a movable seal assembly within the fluid chamber with a first end defining an end of the fluid chamber; the inner mandrel having an outer shoulder for moving the movable seal assembly with the inner mandrel when the inner mandrel moves in a first direction relative to the outer housing to compresses fluid within the fluid chamber; and the outer housing having an inner shoulder for preventing the movable seal assembly from moving with the inner mandrel when the inner mandrel moves in a second direction relative to the outer housing to compresses fluid within the fluid chamber.