Open-hole Packer Line Passage Without Splices
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Solution Overview
Problem
Mechanically-set packer systems in wellbores face challenges in accommodating communication and control lines without splices, which can degrade signal quality and compromise the integrity of the seal, especially in open-hole wellbore operations where swellable materials are not compatible with packing elements.
Innovation Solution
A mechanically-set packer system with a mandrel and packing element configuration that allows a continuous line to traverse the system without splices, using non-swellable materials and a sleeve to form a seal, enabling communication and control signals from the surface to downhole tools without interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a line is run through the packing element, exterior of the packer assembly, or through a drilled hole in the mandrel, then communication lines can be accommodated, but the packer assembly may not seal completely when set within the wellbore
Solution Approach 1:
A dedicated line passage is introduced as an intermediary component that allows the communication line to traverse the packer assembly without compromising the seal. The passage is specifically designed to maintain sealing integrity while providing a controlled pathway for the line, resolving the conflict between line accommodation and seal reliability.
Solution Approach 2:
The packer assembly is segmented into distinct functional zones: a sealing zone that maintains contact with the wellbore wall, and a line passage zone that accommodates the communication line. This segmentation allows the sealing elements to focus on creating a reliable seal while the line passage provides a dedicated route for communication, eliminating the trade-off between these two functions.
2Reliability
If swellable materials are used to reduce the potential problem of incomplete sealing, then seal integrity may be improved, but the materials are not compatible with a mechanically-set packing element
Solution Approach 1:
The sealing mechanism is changed from chemical swelling to mechanical expansion. The packing element is designed to be mechanically expandable through controlled deformation, allowing it to conform to the wellbore wall and create a reliable seal without requiring swellable materials. This parameter change enables compatibility with mechanically-set packer systems while maintaining seal integrity.
3Ease of operation
If splicing is used to connect communication lines above and below the packer assembly, then line continuity can be achieved, but signal quality significantly degrades and operational complexity increases
Solution Approach 1:
The communication line is extracted from the traditional splicing approach and instead passed continuously through the packer assembly via the dedicated line passage. This eliminates the need for splicing operations, maintaining signal quality by avoiding connection points while still providing the flexibility to install and maintain the line. The line passage design allows the line to be routed through the assembly without requiring breaks or connections.
Data Source
AI summary
A mechanically-set packer system for use in a wellbore environment may include a mandrel having an interior and an exterior. The system may further include a packing element positioned along the exterior of the mandrel. The system may also include a line positioned between the exterior of the mandrel and an interior of the packing element.