Self-Centralizing Shifting Mechanism With Suspension-Based Engagement

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Solution Overview

Problem

Existing downhole flow control devices in the oil and gas industry face challenges with remote adjustment due to issues such as remote service tool alignment, latch strength, and latch durability, often requiring multiple settings and high hydraulic pressures for shifting operations.

Innovation Solution

A self-centralizing, seek and shifting apparatus with a suspension system that enables the shifting key to mechanically engage the latching profile with minimal pressure, utilizing a mechanism that 'floats' within the chamber and simplifies the shifting operation to a single input pressure, allowing for mechanical centralization and decoupling from high-pressure chambers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If hydraulic pressure is increased to enable shifting operation, then the shifting tool can engage the latching profile, but the stiffness of hydraulic fluid requires higher pressure to operate the shifting tool

Engineering Contradiction:

Improveshifting operation reliabilityVSAvoidhydraulic pressure

Core Design Contradiction:

ReliabilityVSStress or pressure

Solution Approach 1:

The patent introduces a suspension system as an intermediary mechanism between the hydraulic actuation and the shifting key engagement. This suspension system includes springs and linkages that mediate the force transmission, allowing the shifting key to mechanically engage the latching profile with minimal hydraulic pressure by converting hydraulic pressure into mechanical motion through the suspension mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the direct hydraulic actuation system with a mechanical suspension system that uses spring-loaded linkages and geometric constraints to achieve the shifting function. This mechanical substitution eliminates the need for high hydraulic pressure by using purely mechanical means to couple the shifting key to the latching profile.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If multiple settings are used to enable shifter to perform as intended, then the shifter can achieve proper engagement, but the device complexity increases

Engineering Contradiction:

Improveshifter engagementVSAvoidnumber of settings

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent designs the suspension system to perform multiple functions simultaneously: it provides mechanical coupling, enables self-centralization, facilitates seeking engagement, and allows single-pressure operation. This multi-functionality eliminates the need for multiple separate settings or mechanisms, reducing device complexity while maintaining reliable shifter engagement.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The suspension system is designed to be self-adjusting and self-centralizing, automatically positioning the shifting key in the correct engagement position without requiring multiple manual settings. The mechanical linkages and spring mechanisms self-regulate to achieve proper engagement, eliminating the need for complex multi-setting procedures.

Inventive Principle:

Principle #25Self-service

3Reliability

If the shifting key is mechanically coupled to the latching profile, then reliable engagement is achieved, but wear and damage to components increases

Engineering Contradiction:

Improveengagement stabilityVSAvoidwear and damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent employs a dynamic suspension system with spring-loaded linkages that allow controlled movement and flexibility during engagement. This dynamic design enables the shifting key to adapt to slight misalignments and reduces impact forces during engagement, thereby minimizing wear and damage while maintaining reliable engagement stability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The suspension system incorporates spring mechanisms that cushion and absorb impact forces before they reach the shifting key and latching profile interface. This beforehand cushioning reduces the transmission of shock loads and minimizes wear on the engagement components, extending their service life while maintaining reliable engagement.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS12442258B2Self centralizing, seek and shifting apparatus with suspension system

Publication Date: 2025.10.14 HALLIBURTON ENERGY SERVICES INC

AI summary

A downhole system may include a housing securable to a conveyance, a first linkage base disposed proximate a first shoulder of the housing in a collapsed position, and a second linkage base disposed proximate a second shoulder of the housing in the collapsed position. Further, the downhole system may include a shifting key configured to move between the collapsed position and an expanded position in response to movement of the first linkage base and/or the second linkage base. The shifting key is secured to the first linkage base via a first linkage arm and to the second linkage base via a second linkage arm. The first linkage base is configured to contact the first shoulder of the housing, with the shifting key in the expanded position, to transfer a load on the shifting key to the housing through the first linkage arm and the first linkage base.