Removable Liner Hanger With Expandable Arms
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Solution Overview
Problem
Conventional liner hangers are difficult to remove once set in place, limiting their reusability and flexibility in hydrocarbon well construction.
Innovation Solution
A liner hanger apparatus featuring radially expandable arms with longitudinally movable cones and a compressible sleeve, allowing for selective expansion and retraction to securely engage and disengage from the well bore, enabling easy installation and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liner hangers are set in place using frictional engagement, then they provide stable suspension of the liner, but they become difficult to remove thereafter
Solution Approach 1:
The liner hanger employs dynamically adjustable gripping elements that can transition between expanded and retracted states. The expandable arms with conical surfaces allow the hanger to adapt its grip strength and engagement level, enabling easy insertion through expansion followed by controlled retraction for removal, thus resolving the contradiction between stable suspension and ease of removal
Solution Approach 2:
The invention changes the physical parameters of the gripping elements by using thermoplastic materials that undergo phase changes or dimensional changes in response to temperature or mechanical stress. This allows the gripping elements to alter their frictional engagement characteristics, providing stable hold during operation but enabling easy removal when needed
2Adaptability or versatility
If liner hangers are designed for easy removal, then reusability and flexibility are improved, but the security and reliability of liner suspension may be compromised
Solution Approach 1:
The dynamically adjustable gripping elements can be positioned at different expansion levels to provide varying degrees of security. During normal operation, the arms can be expanded to provide strong frictional engagement for reliable suspension, while being able to retract when removal is needed, thus maintaining both reliability and adaptability
Solution Approach 2:
The liner hanger incorporates feedback mechanisms that monitor the engagement state of the gripping elements and adjust their position accordingly. This ensures that the hanger maintains optimal grip strength for reliable suspension while being able to detect when removal is required, balancing security with flexibility
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 apparatus provides a secure and removable solution for suspending liners within well bores, facilitating efficient installation and retrieval, thus enhancing operational flexibility and reducing maintenance costs.
Implementation Method 1
Each set of arms are expandable by corresponding longitudinally movable cones spaced apart along the tubular member
Implementation Method 2
a selectably longitudinally compressible sleeve located between the first and second sets of radially expandable arms
Implementation Method 3
a seal located between the first and second sets of radially expandable arms
Data Source
AI summary
An apparatus for suspending a liner within a bore comprising a central tubular member and first and second sets of radially expandable arms. Each set of arms are expandable by corresponding longitudinally movable cones spaced apart along the tubular member. The apparatus further includes a seal located between the first and second sets of radially expandable arms and a selectably longitudinally compressible sleeve located between the first and second sets of radially expandable arms.