Seal Assembly for Packer Zone Isolation
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Solution Overview
Problem
Conventional dual packers used in multi-zone wellbores are complex, time-consuming to manufacture and assemble, and prone to failure under high differential pressures, which increases costs and reduces their effectiveness.
Innovation Solution
A seal assembly that includes a sealing structure with a housing assembly defining control line ports and flow conduit passages, allowing for flexible assembly and operation as either a floating or anchored seal, with control lines and flow conduits that enable effective fluid isolation and selective zone control, reducing sensitivity to differential pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional dual packer is used to isolate multiple zones in a wellbore, then fluid isolation between zones is achieved, but the device complexity and manufacturing time increase, leading to higher costs
Solution Approach 1:
The packer is divided into two independent pack elements (first and second pack elements) that can function separately. Each pack element has its own sealing capability, allowing the system to achieve zone isolation through simpler, modular components rather than a single complex dual-pack structure.
Solution Approach 2:
The production string is extracted through only the first pack element, allowing the second pack element to remain independent and simple. This separation eliminates the need for the second pack element to accommodate production string passage, reducing its complexity and the overall device complexity.
2Reliability
If a conventional dual packer is used to isolate multiple zones, then zone isolation is achieved, but the assembly time increases significantly
Solution Approach 1:
The packer system is segmented into independent pack elements that can be assembled and deployed separately. The first pack element with the production string can be installed independently, followed by the second pack element, significantly reducing the overall assembly time compared to traditional dual packers that require complex integrated assembly.
3Adaptability or versatility
If conduits for hydraulic lines and electrical lines are provided through the dual packer, then control functionality is enabled, but the maximum differential pressure the packer can withstand is reduced
Solution Approach 1:
The production string and its associated conduits are extracted through only the first pack element. The second pack element remains free of conduits and production string passage, allowing it to maintain full structural integrity and withstand maximum differential pressure without the weakening effects of holes or passages.
Solution Approach 2:
The packer is segmented so that the first pack element handles all conduit and production string functions, while the second pack element is dedicated solely to sealing and pressure containment. This functional segmentation allows the second pack element to achieve maximum pressure resistance.
4Adaptability or versatility
If a conventional dual packer is used, then multiple zones can be isolated, but the cost of manufacture and assembly increases
Solution Approach 1:
The packer system uses segmented, independent pack elements that can be manufactured separately using simpler processes. Each pack element is a standard, relatively simple component rather than a complex integrated dual-pack structure, reducing manufacturing costs while maintaining multi-zone isolation capability.
Data Source
AI summary
A seal assembly sealingly engages a packer that is retrievable from the packer. The seal assembly comprises a sealing structure for receiving by a seal bore of the packer, and a housing assembly defining an inner chamber and having at least one control line conduit and at least one flow conduit passage. The seal assembly further comprises at least one control line extending through the control line conduit into the inner chamber, and at least one flow conduit extending through the flow conduit passage into the inner chamber.