Hydrostatic Piston Glide Spacer Deflection
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Solution Overview
Problem
Hydrostatically actuable downhole piston systems face deflection issues at elevated pressures, leading to inhibited axial movement and potential seizure of components, which hampers the setting process of wellbore tools like packers.
Innovation Solution
Incorporation of glide spacers within the atmospheric chamber of the hydrostatic setting system to mitigate deflection and ensure free movement of piston components, utilizing materials like PEEK, glass-filled PTFE, or nickel-filled PTFE for low friction and structural support, allowing the piston to function effectively at elevated hydrostatic pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If hydrostatic pressure is increased to actuate the piston, then the setting force is improved, but component deflection increases causing seizure
Solution Approach 1:
A glide spacer is introduced as an intermediary component between the piston and the chamber wall. This glide spacer prevents direct contact and potential seizure between the piston and chamber wall while allowing the high hydrostatic pressure to effectively actuate the piston for setting the downhole tool.
2Force
If hydrostatic pressure is increased to actuate the piston, then the setting force is improved, but friction increases inhibiting axial movement
Solution Approach 1:
The glide spacer serves as a mediator that reduces friction between the piston and chamber wall. By introducing this intermediate surface, the piston can move axially more freely under hydrostatic pressure without excessive friction inhibiting the setting operation.
Solution Approach 2:
The glide spacer changes the friction parameter at the interface between piston and chamber wall. By providing a low-friction surface, the effective coefficient of friction is reduced, enabling smooth axial movement of the piston during the setting process.
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 use of glide spacers enables the hydrostatically actuable piston to maintain axial movement and effectively set wellbore tools by reducing deflection and friction, ensuring reliable operation even at high wellbore pressures.
Implementation Method 1
the glide spacer provides a low friction surface for longitudinal movement of the hydrostatic piston
Data Source
AI summary
A hydrostatically actuable downhole piston apparatus for use in a wellbore, comprising glide spacers disposed in the primary chamber, capable of mitigating the deflection of the piston and other hydrostatic components at elevated wellbore hydrostatic pressures. The disclosed apparatus is suited for, among other applications, the hydrostatic setting of a downhole tool, such as a packer, in a wellbore. A method and system for hydrostatically setting a downhole tool using glide spacers disposed in the primary chamber of the downhole tool.