Bulk Metallic Glass Seals for Downhole Pressure Integrity
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Solution Overview
Problem
Conventional wellbore seals face challenges such as gas absorption, chemical sensitivity, abrasion, and failure under high pressure and temperature conditions, leading to potential leaks and equipment damage.
Innovation Solution
The use of bulk metallic glass (BMG) as a material for sealing elements in downhole tools, such as packers, which provides high strength, chemical resistance, and resistance to deformation and failure under extreme conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing materials are used in downhole applications, then the seals may be easier to manufacture and install, but they are prone to failure under high pressure and temperature conditions, leading to gas absorption, chemical sensitivity, and mechanical failure
Solution Approach 1:
The patent changes the fundamental material parameters by transitioning from crystalline or polymeric materials to bulk metallic glass (amorphous metal) with a disordered atomic structure. This parameter change enables the seal to achieve superior mechanical properties including high yield strength, elastic modulus, and fracture toughness, allowing it to withstand large pressure differentials and extreme temperatures without failure, gas absorption, or chemical degradation
Solution Approach 2:
The patent employs bulk metallic glass as a composite material solution, combining metallic elements in an amorphous structure to create a seal material that integrates multiple desirable properties: the strength and hardness of metals with the flexibility and corrosion resistance needed for downhole sealing applications, thereby achieving both high reliability and manufacturability
2Reliability
If the seal is designed to withstand substantial pressure differentials, then the sealing performance is improved, but the internal stress and deformation on the sealing element increase, raising the chance of failure
Solution Approach 1:
The patent fundamentally changes the material strength parameters by using bulk metallic glass, which exhibits exceptionally high yield strength and elastic modulus compared to conventional sealing materials. This parameter change allows the seal to resist substantial internal stresses and deformations induced by large pressure differentials without failing, while maintaining its structural integrity and sealing capability
3Reliability
If the seal material is made more resistant to deformation and failure, then the reliability under extreme conditions is improved, but the material choice and manufacturing options become more limited
Solution Approach 1:
The patent achieves a breakthrough by changing the material state parameter from crystalline or polymeric to amorphous (bulk metallic glass). This parameter change unlocks a new class of materials with tunable compositions and properties, providing both high resistance to deformation and failure under extreme conditions and sufficient versatility for downhole sealing applications through controlled alloying and processing
Data Source
AI summary
A variety of methods and apparatus are disclosed, including, in one embodiment, a downhole tool for use in a borehole, comprising: a mandrel; and a sealing element disposed about the mandrel, wherein the sealing element comprises bulk metallic glass (BMG).