Metallic Seal Element Radial Expansion Design

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Solution Overview

Problem

Existing radial seals in wellbore packer devices face challenges in maintaining a reliable fluid seal due to strain points that can cause failure during radial expansion, and they are susceptible to chemical deterioration.

Innovation Solution

A radially expandable metallic seal element, preferably made of a copper-based alloy or stainless steel, with a design featuring expansion segments and an elastically deformable web portion, allowing for high radial expansion without straining and incorporating a filler material to ensure a resilient seal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a radially expandable seal element is used in a packer device, then the seal can be installed in a compact form and expanded to seal against the casing, but the seal element develops strain points during expansion that can cause failure and rupture

Engineering Contradiction:

Improveradial expansion capabilityVSAvoidseal element durability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The seal element is divided into multiple expandable segments around its circumference, each segment capable of independent radial expansion. This segmentation allows the seal to expand uniformly without creating concentrated strain points, as each segment expands independently rather than forcing a continuous structure to deform. The segments are connected in a way that distributes mechanical stress evenly across the entire seal element during expansion.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The seal element transitions from a static compact form to a dynamic expanded state through controlled radial expansion. The expandable segments are designed to flex and deform elastically during expansion, absorbing mechanical energy and preventing permanent strain accumulation. This dynamic behavior allows the seal to adapt to the casing geometry while maintaining structural integrity.

Inventive Principle:

Principle #15Dynamics

2Reliability

If traditional seal materials are used in wellbore environments, then the seals can provide initial sealing, but they are susceptible to chemical deterioration from exposure to wellbore fluids

Engineering Contradiction:

Improveseal functionalityVSAvoidchemical deterioration resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The seal element combines a metallic base material (such as stainless steel or nickel alloy) with an elastomeric coating layer. The metallic core provides structural strength, chemical resistance to wellbore fluids, and durability under high pressure and temperature. The elastomeric outer layer provides enhanced sealing properties and flexibility. This composite structure leverages the complementary properties of both materials to overcome the limitations of traditional single-material seals.

Inventive Principle:

Principle #40Composite materials

3Stress or pressure

If the seal element is designed to expand radially to seal against the casing, then sealing pressure is achieved, but the expansion process creates points of strain that lead to failure

Engineering Contradiction:

Improvesealing pressureVSAvoidresistance to strain-induced failure

Core Design Contradiction:

Stress or pressureVSStrength

Solution Approach 1:

By dividing the seal element into multiple independent expandable segments, the mechanical stress during radial expansion is distributed across numerous small units rather than concentrated in a continuous structure. Each segment experiences reduced strain, preventing the formation of critical stress concentration points that would lead to failure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The seal element utilizes materials with specific mechanical properties including high elastic limit and ductility. The metallic composite material is selected to withstand the strain induced by radial expansion while maintaining structural integrity. The material parameters are optimized to balance flexibility during expansion with strength during the sealed state.

Inventive Principle:

Principle #35Parameter changes

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 enables a durable, chemically resistant, and high-expansion seal that effectively seals against tubular members without failing, maintaining a reliable fluid seal even under high pressures and returning to its original configuration, thus addressing the limitations of existing seals.

Implementation Method 1

an elastically deformable web portion that joins the legs together... During radial expansion of the seal element, the web portion is elastically deformed as the legs are angled apart from each other

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

The chamber is preferably filled with a filler material, such as a fluid or an elastomer. The filler material helps to ensure a resilient seal is formed against the surrounding tubular

Methodology Applied

Scientific EffectBuoyancy: Archimedes' Principle (Buoyancy)

Data Source

PatentUS8714273B2High expansion metal seal system

Publication Date: 2014.05.06 BAKER HUGHES CO

AI summary

A seal system for forming a fluid seal from an inner tubular member outwardly against an outer tubular member. The seal system includes a packer element that is radially expandable from a reduced diameter, unset condition to an enlarged diameter, set condition; and a radially expandable seal element surrounding the packer element and creating a fluid sealing engagement outwardly against the outer tubular member.