Downhole Orienting Helix for Even Rotation During Pullout

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Solution Overview

Problem

During the connection process of a control line with a slotted sub and an orienting sub, uneven amounts of rotation can cause unthreading of the work string and tangling of the control line due to differences in rotation direction between insertion and retraction, which is unfavorable for the connection process.

Innovation Solution

The use of a slotted sub with a main guide feature and pullout guide feature to control the rotation of the orienting sub, ensuring even rotation during axial movement by guiding the orienting sub through a helical portion and preventing rotation during pullout, thereby maintaining alignment and preventing tangling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the orienting sub is picked up and reinserted through the slotted sub interface, then the control line can be connected to the corresponding connection, but the uneven rotation amounts in opposite directions cause the work string to unthread and the control line to tangle

Engineering Contradiction:

Improvecontrol line connectionVSAvoidwork string alignment

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent employs a helical guide feature within the slotted sub that converts the linear axial movement of the orienting sub into controlled rotational movement. This curved path ensures that the orienting sub rotates by a precise amount during both pickup and reinsertion operations, eliminating the uneven rotation problem that causes unthreading and tangling.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent changes the rotational parameter of the orienting sub by implementing a guide feature with specific geometric parameters (helix angle, pitch, and length). By carefully designing these parameters, the system ensures that the total rotation during pickup equals the total rotation during reinsertion, maintaining consistent alignment throughout the operation.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the interface between slotted sub and orienting sub allows free rotation, then the control line can align with the corresponding connection, but the uneven rotation amounts create harmful effects on the work string and control line

Engineering Contradiction:

Improvecontrol line alignmentVSAvoidtangling and unthreading

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the potentially harmful uncontrolled rotation into a beneficial controlled rotation mechanism. The helical guide feature transforms what would be random or uneven rotation into a precise, repeatable rotational movement that actually helps align the control line while preventing the harmful effects of unthreading and tangling.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The helical guide feature acts as an intermediary element between the slotted sub and the orienting sub. It mediates the rotational interaction by providing a controlled path that limits and directs the rotation, ensuring that the orienting sub rotates by the correct amount without causing damage to the work string or control line.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution ensures consistent rotation during the connection process, reducing the risk of unthreading and tangling, thereby enhancing the reliability and efficiency of the connection between the control line and the corresponding connection.

Implementation Method 1

the helical portion may be configured to drive rotation of the orienting sub as the orienting sub moves in the axially uphole direction

Methodology Applied

Scientific EffectHelical motion conversion: Helix

Data Source

PatentUS12612834B2Downhole orienting helix for operations requiring multiple orienting sequences

Publication Date: 2026.04.28 HALLIBURTON ENERGY SERVICES INC

AI summary

A slotted sub apparatus may include a tubular body portion and a main guide feature extending axially along the tubular body portion. The main guide feature is configured to receive a key of an orienting sub, and an interface between the key and sidewalls of the main guide feature is configured to guide rotation of the orienting sub as the orienting sub moves axially with respect to the tubular body portion. The slotted sub apparatus may further include at least one pullout guide feature configured to receive the key of the orienting sub as the orienting sub moves in an axially uphole direction with respect to the tubular body portion. The at least one pullout feature is configured to guide rotation of the orienting sub as the key moves along the at least one pullout guide feature.