Non-magnetic Hardfacing for Drill String Wear Resistance
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Solution Overview
Problem
Downhole tools and components for oil and natural gas wells require wear resistance and fracture toughness while minimizing magnetic permeability to avoid interference with sensitive instrumentation, as existing hardfacing materials often have high magnetic permeability.
Innovation Solution
A non-magnetic, abrasive wear-resistant hardfacing material is applied to drill string members, comprising sintered carbides dispersed in a non-magnetic matrix alloy, which is heated and solidified to form a layer with reduced magnetic permeability, suitable for use in areas with sensitive drilling instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hardfacing materials are used to provide wear resistance and fracture toughness, then the drill string member achieves high wear resistance, but the magnetic permeability increases and interferes with sensitive downhole instrumentation
Solution Approach 1:
The patent applies composite materials by combining non-magnetic carbide particles (providing wear resistance) with a non-magnetic metal matrix alloy (providing fracture toughness and low magnetic permeability). This composite structure achieves both high wear resistance and reduced magnetic interference, resolving the contradiction between protective performance and magnetic compatibility for downhole instrumentation.
2Strength
If hardfacing material is applied by melting the matrix to achieve adequate fracture toughness, then the hardfacing material achieves proper bonding and toughness, but magnetic permeability increases due to conventional matrix materials
Solution Approach 1:
The patent applies parameter changes by selecting a non-magnetic metal matrix alloy with specific compositional parameters (low magnetic permeability) while maintaining the melting and solidification process to achieve adequate fracture toughness. The matrix material parameters are changed to be non-magnetic, allowing the hardfacing to be applied through conventional thermal processes without introducing magnetic interference.
3Object-affected harmful factors
If non-magnetic materials are used to reduce magnetic permeability, then magnetic interference with instrumentation is reduced, but wear resistance and fracture toughness may be compromised
Solution Approach 1:
The patent uses composite materials to combine non-magnetic carbide particles (providing wear resistance) with a non-magnetic metal matrix alloy (providing fracture toughness). This composite approach ensures that reducing magnetic permeability does not compromise wear resistance, as both functions are provided by different components of the composite hardfacing material.
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 provides enhanced wear resistance and fracture toughness while maintaining reduced magnetic permeability, ensuring compatibility with sensitive drilling instruments and optimizing their performance.
Implementation Method 1
heating a portion of the non-magnetic hardfacing precursor material to a temperature above the melting point of the matrix material to melt the matrix material
Implementation Method 2
solidifying the molten non-magnetic matrix material to form a layer of a non-magnetic hardfacing material
Data Source
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AI summary
A method for applying a non-magnetic, abrasive, wear-resistant hardfacing material to a surface of a drill string member includes providing a non-magnetic drill string member formed of a non-magnetic material, the drill string member having an outer surface. It also includes providing a non-magnetic hardfacing precursor material comprising a plurality of non-magnetic, sintered carbide pellets and a non-magnetic matrix material; heating a portion of the non-magnetic hardfacing precursor material to a temperature above the melting point of the matrix material to melt the matrix material. It further includes applying the molten non-magnetic matrix material and the plurality of non-magnetic, sintered carbide pellets to the exterior surface of the drill string member; and solidifying the molten non-magnetic matrix material to form a layer of a non-magnetic hardfacing material having a plurality of non-magnetic, sintered carbide pellets dispersed in the hardfacing material.