Extensible Transition Joint for Downhole Control Line Protection
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Solution Overview
Problem
Control lines are prone to damage when passing through junctions in wellbores due to rubbing and pinching, which can lead to cuts, abrasions, or crushing during the deployment process.
Innovation Solution
An extensible transition joint (ETJ) system that includes an extendable tubular with a first member movably disposed within a second member, protected by a scoop-head and sealed to prevent damage, and operated by fluid pressure to extend and retract, using tools like the ETJDT and CDRT for deployment and retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control lines are run through a junction (casing window), then communications and control can be established in lateral wellbores, but the control lines are prone to rubbing, pinching, cutting, or abrasion against the junction
Solution Approach 1:
The patent introduces an intermediary protective structure (the transition joint with scoop-head and sealed body) that mediates between the control line and the harmful junction environment. This intermediary component physically blocks the control line from direct contact with the junction's harmful surfaces, thereby protecting the control line while still allowing it to pass through the junction for wellbore communication purposes
2Productivity
If the control lines are fastened to pick up on a completion string, then the completion string can be deployed, but the control lines are pinched, crushed, or damaged against the top edge of the junction
Solution Approach 1:
The patent applies preliminary action by positioning the protective transition joint at the junction before deploying the completion string. The scoop-head and sealed body are installed in advance to create a protected pathway, ensuring that when the control lines are subsequently fastened to the completion string, they do so without contact with the harmful junction surfaces
Solution Approach 2:
The transition joint structure provides beforehand cushioning by creating a physical buffer and protective barrier in advance. The scoop-head and sealed body act as cushioning elements that absorb and distribute the mechanical stresses during completion string deployment, preventing direct pinching and crushing of the control lines against the junction
3Object-affected harmful factors
If a protective structure is added to protect control lines at the junction, then control line damage is reduced, but the device complexity increases
Solution Approach 1:
The patent applies the nested doll principle by designing the transition joint with a scoop-head that fits within or attaches to the existing junction structure, and a sealed body that nests around the control line. This nested configuration provides comprehensive protection while minimizing the overall footprint and integration complexity with the existing wellbore infrastructure
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 ETJ system effectively protects control lines by minimizing contact with junctions, allowing safe passage through wellbores and enabling the deployment of completion strings without causing damage, ensuring smooth operation and functionality.
Implementation Method 1
operated by fluid pressure to extend and retract
Data Source
AI summary
Systems and methods of the present disclosure relate to protecting a control line as it passes through a junction in a downhole environment. An ETJ deployment tool (ETJDT) comprises a tool body comprising a central bore; at least one first component and at least one second component, each component operable to extend and retract laterally from the tool body, wherein the at least one second component is disposed at an axial distance from the at least one first component along the tool body; a member disposed within the central bore and operable to move forward upon receiving fluid; and a spring disposed axially between a portion of the member and the at least one second component.