Compression-Set Packer Uphole End With Bias Element
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Solution Overview
Problem
Existing straddle packers for wellbore pressure isolation are unreliable and costly due to their complexity, making them inefficient for precision well stimulation and remediation.
Innovation Solution
A novel uphole end for a compression-set straddle packer featuring a multicomponent mandrel with a bias element and sliding sleeve design, allowing for reliable operation and adjustable pressure isolation in wellbores, with a bias element that resists movement and facilitates fluid flow for effective well stimulation or remediation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional straddle packers are used for wellbore pressure isolation, then pressure isolation function is achieved, but reliability is poor and device complexity is high
Solution Approach 1:
The packer system is divided into distinct functional modules: a compression-set packer for sealing, a multicomponent sliding sleeve for controlled movement, a bias element for constant resistance, and a multicomponent mandrel for structural support. Each module performs a specific function, simplifying the overall system while improving reliability through modular design.
Solution Approach 2:
The multicomponent sliding sleeve serves multiple functions: it guides the packer element during setting, provides a pathway for fluid flow, houses the bias element, and enables reciprocating motion within a limited range. This multi-functionality reduces the need for separate components, lowering overall device complexity.
2Reliability
If traditional straddle packers are used for precision well stimulation, then pressure isolation is achieved, but operational costs are high
Solution Approach 1:
The bias element automatically provides constant resistance to sliding sleeve movement without requiring external control systems or additional energy input. The compression-set packer self-sets through compression forces, eliminating the need for complex setting mechanisms. These self-service features reduce manufacturing complexity and maintenance requirements.
Solution Approach 2:
The design uses simple, robust components that can be manufactured cost-effectively. The compression-set packer element is a relatively simple rubber or elastomeric component compared to complex mechanical sealing systems, reducing material and manufacturing costs while maintaining reliability.
3Reliability
If a multicomponent sliding sleeve with bias element is used, then operational reliability is improved, but device complexity increases
Solution Approach 1:
The bias element is nested within the multicomponent sliding sleeve, which itself is surrounded by the multicomponent mandrel. This nested arrangement allows multiple components to occupy the same space efficiently, reducing the overall footprint and simplifying assembly while maintaining the functional benefits of each component.
Solution Approach 2:
The sliding sleeve is designed to reciprocate within a limited range rather than being completely fixed or fully free-moving. This controlled dynamic movement allows the system to adapt to downhole conditions while maintaining reliability, and the limited range of motion simplifies the mechanical constraints compared to fully dynamic systems.
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 uphole end enables reliable and adjustable pressure isolation in wellbores, allowing for efficient well stimulation or remediation treatments while reducing operational complexity and costs by using a multicomponent mandrel and sliding sleeve system.
Implementation Method 1
a bias element supported on the bias element support component of the multicomponent mandrel between the bias element push component and a lower end of the bias element chamber, the bias element constantly resisting any movement of the multicomponent sliding sleeve with respect to the multicomponent mandrel
Data Source
AI summary
An uphole end for a compression-set straddle packer has a multicomponent mandrel and a multicomponent sliding sleeve that reciprocates within a limited range on the multicomponent mandrel. A bias element constantly resists relative movement between the multicomponent mandrel and the multicomponent sliding sleeve.