Graphite Housing Seals for High-Temperature ESP Joints

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Solution Overview

Problem

Existing elastomeric and high-temperature elastomer seals used in downhole environments face issues such as accelerated aging, high cost, and susceptibility to metal fatigue, requiring improved sealing solutions for high-temperature applications.

Innovation Solution

The use of graphite seals, made from isostatically pressed graphite with high purity, which are transformed into a sealing configuration through axial loading, providing effective sealing in threaded, pinned, bolted, and interference connections within ESP assemblies, capable of operating at temperatures up to 550°C.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional elastomeric seals are used in high-temperature environments, then sealing function is provided, but the aging rate is drastically accelerated by temperature above 300°C

Engineering Contradiction:

Improvetemperature resistanceVSAvoidseal aging resistance

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent changes the material parameter from elastomeric to graphite, which fundamentally alters the temperature resistance characteristics. Graphite seals can operate at temperatures up to 550°C without the accelerated aging that affects elastomeric seals above 300°C, directly resolving the contradiction between temperature resistance and reliability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs graphite, a non-metallic composite material, to create seals that combine high-temperature resistance with chemical inertness. This material substitution eliminates the thermal degradation issues inherent in elastomeric materials while maintaining effective sealing functionality in harsh downhole environments.

Inventive Principle:

Principle #40Composite materials

2Temperature

If high-temperature thermoplastics or metal-to-metal seals are used, then enhanced resistance to chemicals and high-temperature working fluids is achieved, but tight tolerances and susceptibility to metal fatigue occur

Engineering Contradiction:

Improvetemperature resistanceVSAvoidtolerance requirements

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The patent changes the material from metal to graphite, which fundamentally alters the manufacturing characteristics. Graphite seals can be manufactured with more relaxed tolerances compared to metal-to-metal seals, eliminating the need for tight tolerances while maintaining high-temperature resistance and chemical durability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs graphite, a non-metallic material that is more forgiving in manufacturing and less susceptible to fatigue, effectively replacing expensive metal seals that require precise tolerances and are prone to metal fatigue in high-temperature applications.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If metal-to-metal seals are used, then enhanced resistance to high-temperature working fluids is achieved, but susceptibility to metal fatigue and requirement for clean environment and special tools during assembly occur

Engineering Contradiction:

Improvechemical resistanceVSAvoidassembly complexity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent uses graphite, a non-metallic composite material, to create seals that provide chemical resistance without the drawbacks of metal seals. Graphite seals are more tolerant of assembly conditions, eliminating the requirement for clean environments and special assembly tools while maintaining reliability in chemically aggressive downhole environments.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent replaces metal seals with graphite seals that are easier to assemble and less sensitive to assembly conditions, reducing the need for special tools and clean environment requirements while maintaining chemical resistance and reliability.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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

Graphite seals offer a cost-effective solution with enhanced temperature resistance and chemical inertness, maintaining sealing integrity in harsh downhole conditions, reducing the risk of contamination and equipment failure.

Implementation Method 1

a first housing (152A) configured to receive the graphite seal (300) and apply a compression force to the graphite seal (300)

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 2

the graphite seal (300) expands in a radial direction away from the central axis (320) in response to the compression force

Methodology Applied

Scientific EffectRadial expansion: Thermal Expansion

Data Source

PatentUS12595804B2Housing joints with compression loaded graphite seals for downhole ESP use

Publication Date: 2026.04.07 HALLIBURTON ENERGY SERVICES INC

AI summary

A seal mechanism for an electric submersible pump (ESP) assembly comprising a graphite ring installed on a first component with an installation configuration and a sealing configuration. The graphite ring is installed on an external sealing surface of a first component. An internal sealing surface of a second component is aligned with the graphite ring. An activation force transitions the graphite ring from the installation configuration to a sealing configuration wherein the graphite ring forms a seal to the external sealing surface of the first component and the internal sealing surface of the second component.