Wellsite Hardfacing with Distributed Vanadium Carbide
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Solution Overview
Problem
Existing wellsite equipment faces wear and damage due to harsh wellbore conditions during drilling operations, and conventional hardfacing methods do not provide adequate wear resistance and thermal expansion matching with stainless steel components.
Innovation Solution
A hardfacing composition with a matrix phase of metal alloy and a hard phase of abrasion-resistant materials like vanadium carbide, applied in a way that the surface portion has a higher concentration of the hard phase than the bottom portion, providing a wear-resistant surface with a segregation line and suitable thermal expansion characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hardfacing methods are used, then wear resistance is provided, but thermal expansion matching with stainless steel components is inadequate
Solution Approach 1:
The patent applies parameter changes by controlling the chemical composition parameters of the hardfacing material, specifically limiting carbon content to 0.03-0.10% and nickel to 3.0-10.0%, while requiring chromium content of 12.0-20.0%. These compositional parameter adjustments enable the hardfacing to achieve both wear resistance and thermal expansion compatibility with stainless steel components, resolving the contradiction between durability and thermal compatibility.
Solution Approach 2:
The patent employs composite materials by creating a hardfacing composition that combines multiple elements (chromium, nickel, carbon, manganese, molybdenum, titanium, vanadium, nitrogen, and iron) in specific proportions. This composite structure provides both the hardness needed for wear resistance and the thermal expansion properties needed to match stainless steel, simultaneously addressing both requirements that cannot be met by single-material solutions.
2Reliability
If high concentration of hard phase is used throughout the hardfacing, then wear resistance is improved, but thermal expansion matching deteriorates
Solution Approach 1:
The patent applies local quality by creating a non-uniform distribution of the hard phase within the hardfacing structure. The hard phase concentration varies through the thickness of the hardfacing layer, with higher concentrations near the surface for wear resistance and lower concentrations toward the substrate interface for thermal expansion matching. This spatial variation in composition allows each region to fulfill its specific functional requirement.
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 hardfacing composition significantly enhances wear resistance and thermal expansion matching with stainless steel components, reducing wear and damage to wellsite equipment while maintaining structural integrity under harsh drilling conditions.
Implementation Method 1
The hard phase comprises an abrasion-resistant composition comprising a hard material
Implementation Method 2
The abrasion-resistant composition may have a Vickers Hardness ≧about 2000, a density ≦about 15.0 g/cm3, and/or a coefficient of thermal expansion of about 5×10−6 m/m/K to about 15×10−6 m/m/K
Data Source
AI summary
A hardfacing disposable on a surface of a component, such as a wellsite component, is disclosed. The hardfacing comprises a surface portion and a bottom portion with a segregation line defined therebetween. The surface portion and the bottom portion each include a matrix phase including a matrix composition made of a metal alloy and a hard phase distributed in the matrix phase. The hard phase may include an abrasion-resistant composition made of a hard material (e.g., vanadium carbide). The surface portion has a first concentration of the abrasion-resistant composition and the bottom portion has a second concentration of the abrasion-resistant composition with the first concentration being greater than the second concentration such that a wear resistant surface is defined on the surface of the component.