Downhole Tool Compound Cylinder Collapse Resistance
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Solution Overview
Problem
Current downhole tools face challenges in resisting deformation under high hydrostatic pressures encountered in deep well operations, limiting their effectiveness and reliability in deep and high-pressure environments.
Innovation Solution
The implementation of downhole tools with thick cylinder constructions, such as compound, wire-wrapped, or auto-frettaged tubular members, which create a pressure chamber at atmospheric pressure and are exposed to hydrostatic pressure, resisting deformation through controlled hoop stress and fluid sealing to maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional thin-walled tubular members are used in downhole tools, then the device complexity is reduced and ease of manufacture is improved, but the structural strength and resistance to hydrostatic pressure collapse deteriorate
Solution Approach 1:
The patent applies nesting by placing one tubular member inside another concentrically, creating a compound cylinder structure where an inner tubular member is nested within an outer tubular member. This nested configuration allows both members to share the hydrostatic pressure load, significantly improving collapse resistance compared to a single thin-walled member, while the modular nested design facilitates manufacturing through sequential assembly of pre-formed tubular components
Solution Approach 2:
The patent employs composite construction by combining multiple tubular members with different wall thicknesses and material properties into a compound cylinder system. The inner and outer tubular members can be made from different materials or have different thickness profiles optimized for specific stress distributions, creating a composite structure that achieves superior strength-to-weight ratio and pressure resistance compared to conventional homogeneous thin-walled designs
2Reliability
If thick cylinder constructions are implemented to resist deformation, then the reliability and structural integrity are improved, but the ease of manufacture and device complexity are worsened
Solution Approach 1:
The patent segments the thick cylinder structure into multiple separate tubular members (inner and outer members) that can be manufactured independently using conventional drilling and processing techniques. Each tubular member can be fabricated to standard specifications and then assembled concentrically, avoiding the need to manufacture a single complex thick-walled component as one integral piece, thereby improving ease of manufacture while maintaining the reliability benefits of thick cylinder construction
Solution Approach 2:
The nested configuration allows each tubular member to be manufactured separately and then assembled by placing the inner member within the outer member. This modular nested approach simplifies manufacturing compared to creating a single monolithic thick cylinder, as each component can be produced using standard industrial processes and then combined through controlled assembly procedures
3Strength
If compound cylinder structures with concentric tubular members are used, then the resistance to hydrostatic pressure is improved, but the device complexity and structural complexity increase
Solution Approach 1:
The patent implements nesting by concentrically positioning tubular members one within another, creating a compact compound cylinder structure. This nested arrangement achieves high collapse resistance through the combined strength of multiple members sharing the pressure load, while the concentric geometry provides structural efficiency and symmetry that simplifies the overall design compared to more complex multi-component configurations
Solution Approach 2:
The patent merges multiple tubular members into a unified compound cylinder structure where the inner and outer members work together as an integrated pressure-resistant system. By combining these members in a concentric configuration, the structure achieves enhanced collapse resistance that is greater than the sum of individual members, while the merged design reduces the number of separate components needed compared to non-concentric or offset configurations
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
These deformation-resistant downhole tools can operate effectively in deep wells and high-pressure environments without collapsing, facilitating safer and more efficient oil and gas recovery by maintaining tool integrity and performance.
Implementation Method 1
resisting deformation through controlled hoop stress
Implementation Method 2
fluid sealing to maintain structural integrity
Data Source
AI summary
A downhole tool includes a housing including a connection for coupling with a conveyance that extends from a terranean surface into a wellbore; a first tubular member coupled with the housing, the first tubular member including a first compound cylinder; and a second tubular member coupled with the housing and concentrically positioned radially adjacent the first tubular member, the second tubular member including a second compound cylinder, the first and second tubular members defining a pressure chamber between an inner surface of the first tubular member and an outer surface of the second tubular member.