Variable Density Element Retainer for Downhole Packer Seals
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Solution Overview
Problem
Packer seal failures in wellbore environments due to inadequate element retainers, which can be either too rigid or too weak, leading to insufficient expansion and sealing issues, especially in high-pressure, high-temperature conditions.
Innovation Solution
A variable density element retainer with high-density and low-density regions, manufactured using additive techniques like laser-heated powder deposition, providing rigidity for retaining elastomeric elements while allowing for expansion without excessive deformation, thus enhancing packer seal capability and reducing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If element retainers are made rigid to retain elastomeric elements during compression, then retention strength is improved, but the retainer prevents sufficient expansion of elastomeric elements causing weak seal
Solution Approach 1:
The element retainer incorporates regions of varying density within its structure. High-density regions provide the necessary strength for retaining elastomeric elements during compression, while low-density regions allow sufficient expansion to form reliable seals against the wellbore wall.
Solution Approach 2:
The element retainer is constructed as a composite structure with multiple density zones, combining materials or structural configurations that exhibit different mechanical properties to simultaneously achieve both retention strength and seal reliability.
2Reliability
If element retainers are made weak to allow expansion, then seal formation is improved, but the retainer deforms excessively and buckles under expansive force
Solution Approach 1:
The element retainer incorporates regions of varying density within its structure. High-density regions provide the necessary strength for retaining elastomeric elements during compression, while low-density regions allow sufficient expansion to form reliable seals against the wellbore wall.
Solution Approach 2:
The retainer's density parameter is varied spatially to optimize performance: high-density zones maintain structural integrity and prevent buckling, while low-density zones facilitate adequate expansion for seal formation.
3Ease of manufacture
If traditional single-density retainers are used, then manufacturing is simplified, but packer setting fails in high-pressure high-temperature environments
Solution Approach 1:
The retainer's density parameter is varied spatially to optimize performance: high-density zones maintain structural integrity and prevent buckling, while low-density zones facilitate adequate expansion for seal formation.
Solution Approach 2:
The element retainer is constructed as a composite structure with multiple density zones, combining materials or structural configurations that exhibit different mechanical properties to simultaneously achieve both retention strength and seal reliability.
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 variable density element retainer improves packer seal reliability, reduces the likelihood of seal failures, and minimizes operational time and costs by maintaining effective sealing in challenging conditions with fewer components.
Implementation Method 1
The laser can create the high density and low-density regions by applying heat in different patterns
Implementation Method 2
applying heat to deposed layers of powder using a laser
Data Source
AI summary
A single structure usable as a backup shoe or element retainer in a packer assembly for sealing a wellbore can be fabricated using an additive manufacturing process. The single structure can have a high-density region and a low-density region having a density that is lower than the high-density region. The low-density region can be deformable to retain a position of another component downhole in a wellbore, such as an elastomeric element useable to expand to create the packer seal within the annulus of the wellbore. The high-density region can include a ribbed-structure to reduce circumferential force applied to the single structure.