Degradable Zinc Alloy for Oil and Gas Tools
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Solution Overview
Problem
Current degradable metal and polymer alloys used in the oil and gas industry lack the necessary mechanical properties, such as high strength, hardness, and controlled degradation rates, making them unsuitable for applications like frac plugs and valve components that require deformation resistance and erosion resistance in corrosive environments.
Innovation Solution
A degradable high-strength zinc alloy is developed, incorporating electropositive and electronegative alloying additives, which can be processed through casting or powder metallurgy, offering enhanced strength, hardness, and controlled corrosion rates, suitable for forming completion devices like frac balls and sleeves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If degradable metal alloys (magnesium, aluminum) are used to achieve controlled degradation, then degradation rate is improved, but mechanical strength deteriorates (shear strengths of 15-20 KSI and tensile strengths of 15-45 KSI)
Solution Approach 1:
The patent changes the base metal parameter from magnesium or aluminum to zinc, which inherently provides higher strength properties. It also modifies the alloy composition parameters by incorporating specific elements (Al: 5-30%, Cu: 2-10%, Sn: 1-5%, Pb: 1-5%, Ca: 5-15%, Ga: 0.5-3%) to optimize both strength and degradation characteristics, achieving tensile strengths ≥50 KSI and shear strengths ≥35 KSI while maintaining controlled degradation rates of 0.001-2 mg/cm²/hr at 20°C
Solution Approach 2:
The patent creates a composite alloy system by combining zinc with multiple alloying elements that serve different functions: Al and Cu for strength enhancement, Sn and Pb for controlled degradation, and Ga for galvanic activation. This multi-element composite approach allows simultaneous optimization of mechanical properties and degradation behavior, overcoming the limitations of single-element degradable alloys
2Strength
If higher strength aluminum alloys are used to improve mechanical properties, then strength is improved, but manufacturing cost deteriorates (costly alloying additives or costly processing methods)
Solution Approach 1:
The patent selects zinc as the base metal instead of aluminum, changing the fundamental material parameter. Zinc offers better castability and lower processing costs compared to high-strength aluminum alloys. The alloy composition parameters are optimized to achieve ≥50 KSI tensile strength through relatively inexpensive alloying elements, avoiding the costly processing methods required for high-strength aluminum alloys
3Ease of manufacture
If conventional zinc alloys are used to achieve low cost and ease of manufacture, then manufacturing cost is improved, but degradation control deteriorates (less reactive than magnesium and aluminum, provide less corrosion protection)
Solution Approach 1:
The patent transforms conventional zinc alloy by incorporating multiple functional elements: Ga (0.5-3%) for galvanic activation to enhance corrosion protection, Al (5-30%) and Cu (2-10%) for strength improvement, and Sn (1-5%) plus Pb (1-5%) for controlled degradation rates. This composite approach maintains the cost-effectiveness and manufacturability of zinc while achieving degradation rates of 0.001-2 mg/cm²/hr at 20°C and superior corrosion protection
Solution Approach 2:
The patent modifies the chemical composition parameters of zinc alloy to fundamentally change its reactivity and degradation behavior. By adjusting the concentrations of alloying elements, particularly Ga for galvanic activation and Ca (5-15%) for controlled dissolution, the material achieves both economical manufacturing and controlled degradation, transforming zinc from a corrosion-resistant material to a controllably degradable one
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 degradable high-strength zinc alloy provides superior mechanical properties, including shear strengths above 30 KSI and tensile strengths greater than 50 KSI, with controlled degradation rates in various aqueous media, enabling its use in demanding oil and gas applications without compromising reliability or increasing production costs.
Implementation Method 1
zinc can be used as an active material to galvanically protect steel structures
Implementation Method 2
controlled degradation rates of 5-150 mg/cm2/hr
Data Source
AI summary
A degradable, high-strength zinc composition suitable for use in producing degradable tools and components for in use in oil and gas and related application fields.