Cup-Seal Packer Assembly for Irregular Wellbore Isolation
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Solution Overview
Problem
Existing gravel packing techniques struggle to effectively isolate different zones in a wellbore and prevent cross-flow of fluids while accommodating irregular wellbore shapes, leading to inefficiencies in sand separation and hydrocarbon production.
Innovation Solution
A packer assembly with a mandrel, seal assembly, and deployment system that includes a cup holder and arc arms, which deploy a cup-shaped sealing element to create a seal between the mandrel and the wellbore wall, utilizing a stack assembly to enhance contact stress and accommodate irregular wellbore shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional packers are used to isolate wellbore zones, then fluid isolation is achieved, but they fail to accommodate irregular wellbore shapes resulting in non-uniform contact stress and ineffective sealing
Solution Approach 1:
The packer element is divided into multiple segments that can independently deform and expand. Each segment contains sealing elements that can conform to irregular wellbore surfaces, allowing the overall structure to adapt to non-circular and irregular wellbore shapes while maintaining reliable sealing across the entire circumference.
Solution Approach 2:
The packer employs a dynamic deployment mechanism where the packer element transitions from a compressed transport state to an expanded operational state. The arc arms and lever assemblies enable controlled radial expansion, allowing the sealing elements to dynamically conform to the wellbore wall geometry and achieve uniform contact stress distribution.
2Reliability
If packers are deployed to prevent cross-flow between zones, then fluid isolation is improved, but non-uniform contact stress leads to premature wear and reduced durability
Solution Approach 1:
The packer incorporates multiple sealing elements distributed around the circumference, each capable of independently adjusting to local wellbore irregularities. This ensures uniform contact stress distribution across all sealing points, preventing premature wear at any single location and extending the overall service life while maintaining reliable fluid isolation.
Solution Approach 2:
The packer design allows for controlled variation in radial expansion parameters through the deployment mechanism. By adjusting the expansion force distribution and sequencing, the system achieves optimal contact stress uniformity, which reduces localized wear and extends the duration of effective operation.
3Device complexity
If simple seal deployment mechanisms are used, then device complexity is reduced, but they cannot provide uniform contact stress distribution
Solution Approach 1:
The packer utilizes arc-shaped arms and curved lever assemblies that naturally distribute expansion forces uniformly around the circumference. The curved geometry of these components ensures that contact stress is evenly distributed across all sealing elements, achieving manufacturing precision in stress distribution without requiring complex control systems.
Solution Approach 2:
The deployment mechanism combines multiple functions into integrated components: the arc arms serve as both structural support and force distribution elements, while the lever assemblies simultaneously provide mechanical advantage and uniform force application. This merging of functions achieves contact stress uniformity without proportionally increasing device complexity.
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 provides effective sealing and isolation of wellbore zones, enhancing sand separation and hydrocarbon production by ensuring uniform contact stress distribution in both circular and irregular wellbores, thereby improving fluid isolation and reducing water production.
Implementation Method 1
the seal assembly includes a cup holder and a cup shaped sealing element coupled to the cup holder at a first end and deployable to create a seal between the mandrel and a wellbore wall
Implementation Method 2
compressing the stack assembly such that the stack assembly contacts the cup shaped sealing element to increase contact stress between the cup shaped sealing element and the wellbore wall
Implementation Method 3
The deployment system includes a plurality of arc arms rotatingly coupled to the cup holder and a stack assembly that includes a plurality of packer elements that, when compressed, rotate the plurality of arc arms to deploy the cup shaped sealing element
Data Source
AI summary
A packer assembly for use within a wellbore. The packer assembly may include a mandrel, a seal assembly disposed about the mandrel, and a deployment system disposed about the mandrel. The seal assembly may include a cup holder and a cup shaped sealing element coupled to the cup holder at a first end and deployable to create a seal between the mandrel and a wellbore wall. The deployment system may include a plurality of arc arms rotatingly coupled to the cup holder and a stack assembly that includes a plurality of packer elements that, when compressed, rotate the plurality of arc arms to deploy the cup shaped sealing element.