Telescoping Joint Control Line Coiling for Stroke Extension
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Solution Overview
Problem
Telescoping joints used in offshore wellbore operations face limitations in stroke distance due to axial movements imparting stress on control lines, which restrict their scalable extension and retraction capabilities.
Innovation Solution
A telescoping joint design with a control line management assembly that includes an inner and outer mandrel, seal stacks, and a release assembly, allowing control lines to be coiled around the inner mandrel and securely attached, enabling increased stroke length without damaging the control lines, and allowing them to be run along the outside of the joint to prevent exposure to produced fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control lines are coupled external to production tubing to provide power and communication, then control functionality is enabled, but axial movements of the telescoping joint impart stress on control lines limiting stroke distance
Solution Approach 1:
The control lines are coiled around the inner mandrel of the telescoping joint, nesting the control lines within the telescoping joint structure. This allows the control lines to accommodate the axial movement through coiling while remaining protected and organized within the joint's interior space, resolving the conflict between providing control functionality and maintaining stroke distance.
Solution Approach 2:
Instead of running control lines axially along the telescoping joint where they would be subjected to tensile stress during extension and retraction, the control lines are routed in a circumferential dimension by coiling them around the inner mandrel. This dimensional change from axial to circumferential routing eliminates the direct tensile stress relationship while still providing control functionality.
2Length of moving object
If telescoping joint stroke distance is increased to allow greater axial movement, then tubing hanger landing capability is improved, but control lines experience increased stress and potential damage
Solution Approach 1:
The control lines are nested within the telescoping joint by coiling them around the inner mandrel, which protects them from external damage while accommodating large stroke distances. The coiled configuration allows the control lines to flex and extend without experiencing excessive tensile stress, maintaining reliability during extended axial movements.
Solution Approach 2:
The inner mandrel serves as an intermediary structure around which control lines are coiled. This intermediary allows the control lines to be organized and protected while accommodating the telescoping joint's axial movement through the coiling mechanism, preventing direct stress transmission that would compromise control line integrity.
3Ease of manufacture
If control lines are routed externally along the telescoping joint, then installation is simplified, but control lines are exposed to produced fluids causing potential damage
Solution Approach 1:
The control lines are nested within the telescoping joint structure by coiling them around the inner mandrel, which provides physical protection from produced fluids while maintaining a relatively simple installation process. The coiled configuration allows control lines to be routed through the joint's interior rather than externally, shielding them from corrosive fluid exposure.
Solution Approach 2:
The telescoping joint structure itself acts as an intermediary barrier between the control lines and produced fluids. By routing control lines through the joint's interior space and coiling them around the inner mandrel, the joint structure protects the control lines from fluid exposure while still allowing for practical installation.
Data Source
AI summary
A telescoping joint is provided with one or more control lines and is usable for landing a subsea tubing hanger. The telescoping joint can include an outer mandrel, an inner mandrel, and a control line. The inner mandrel can be releasably coupled to the outer mandrel when run in a wellbore of a subterranean formation. At least part of the inner mandrel can be in an area defined by the outer mandrel and can seal an inner area defined by the inner mandrel from an environment exterior to the outer mandrel. The control line can be exterior to an outer surface of the outer mandrel and coiled around at least part of the inner mandrel.