Telescoping Transition Joint for Control Line Protection

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Solution Overview

Problem

Control lines often suffer damage when passing through junctions in downhole environments due to friction and pinching, which can lead to cuts, abrasions, or pinching during deployment and retrieval in lateral wellbores.

Innovation Solution

A retractable transition joint (RTJ) system is used, comprising two tubular members with a tapered profile and extension lock mechanism, allowing the first member to retract into the second member, thereby protecting the control lines from damage and enabling full access to the primary wellbore.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If control lines are positioned in lateral wellbores through a junction, then communications and control are enabled, but the control lines are damaged due to friction and pinching against the junction edges

Engineering Contradiction:

Improvecontrol line integrityVSAvoidfriction and pinching damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A telescoping transition joint is introduced as an intermediary component between the control line and the junction. This joint includes a first member with a tapered leading end that interfaces with the junction, and a second member that telescopes within the first member. The tapered leading end distributes the contact load over a larger area, reducing stress concentration and preventing pinching and cutting of the control line at the junction edge.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The transition joint employs a telescoping mechanism where the second member can move axially within the first member. This dynamic structure allows the joint to adjust its configuration during deployment and retrieval operations, enabling the control line to pass through smoothly while maintaining protection against friction and pinching forces throughout the operational cycle.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If the control lines are fastened to the completion string and picked up at the junction, then completion operations are enabled, but the control lines are pinched, crushed, or cut by the junction top edge

Engineering Contradiction:

Improvecompletion string deploymentVSAvoidcontrol line strength

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The telescoping transition joint serves as a protective intermediary that the completion string and control lines pass through during pickup operations. The joint's structure, particularly the tapered leading end and telescoping members, prevents direct contact between the control lines and the harsh junction top edge, eliminating pinching and crushing forces while enabling smooth completion operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The transition joint is positioned in advance at the junction to provide protective cushioning before the control lines and completion string encounter the potentially damaging junction top edge. This pre-positioned protection mechanism ensures that when pickup operations occur, the control lines are already shielded from pinching and crushing forces that would otherwise occur at the junction edge.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If a fixed transition joint is used to protect control lines, then protection is provided, but full internal diameter access to the primary wellbore is blocked

Engineering Contradiction:

Improvecontrol line protectionVSAvoidinternal diameter access

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The transition joint uses a telescoping mechanism where the second member can retract axially within the first member. During control line deployment, the joint maintains its extended protective configuration. When protection is not needed, the second member telescopes back, restoring full internal diameter access to the primary wellbore. This dynamic reconfiguration resolves the contradiction between continuous protection and required access.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The transition joint is divided into separable telescoping members that can independently move relative to each other. This segmentation allows the joint to transition between an extended state that provides control line protection and a retracted state that restores full wellbore access, enabling both protection and access requirements to be met at different operational stages.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11661822B2Telescoping transition joint for the protection of control lines and other tools and components

Publication Date: 2023.05.30 HALLIBURTON ENERGY SERVICES INC

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. A retractable transition joint (RTJ) comprises at least two members. A first member is operable to retract into a second member. A tubular extends through the first and second members. The tubular comprises a distal end that is removably attached to a distal end of the second member. The first and second members are operable to receive the control line.