Shaped Charge Liner Nanoparticle Density
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Solution Overview
Problem
Existing shaped charges used in hydrocarbon production for creating perforations in wellbores have limited penetration depth due to low density and acoustic impedance of traditional copper/tungsten liners, with attempts to increase density resulting in particle crushing and work-hardening.
Innovation Solution
Incorporating nano-sized particles with ductility or reactivity into powdered metal mixtures to fill voids and enhance liner density and acoustic impedance, using materials like tungsten, copper, tantalum, bismuth, lead, nickel, aluminum, zinc, magnesium, niobium, zirconium, and titanium to form denser and more effective liners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If higher pressing forces and repeated pressing steps with annealing are used to increase liner density, then the density of the liner is improved, but particle crushing and work-hardening occur which leave undesirable metallurgical outcomes
Solution Approach 1:
The patent changes the particle size parameter by using nanoparticle materials (1-100 nanometer scale) instead of conventional larger particles. This parameter change allows achieving high density without the need for excessive pressing forces that cause work-hardening and particle crushing, as the nanoparticles can pack more efficiently and require less compaction pressure.
Solution Approach 2:
The patent employs composite materials by combining nanoparticle materials with traditional liner materials (copper, tungsten, lead, or tantalum). This composite approach allows the nanoparticle-filled liners to achieve higher density and improved acoustic impedance while maintaining structural integrity and avoiding the metallurgical defects associated with conventional pressing methods.
2Ease of manufacture
If traditional copper/tungsten liners are used, then the liner structure is simple and easy to manufacture, but the penetration depth is limited due to low density and acoustic impedance
Solution Approach 1:
The patent uses composite materials by incorporating nanoparticle fillers into the traditional copper/tungsten liner matrix. This composite structure increases the overall density and acoustic impedance of the liner, thereby enhancing penetration depth while still maintaining compatibility with conventional manufacturing processes such as compression molding.
Solution Approach 2:
The patent changes the density and acoustic impedance parameters of the liner by incorporating nanoparticle materials. These nanoparticles fill voids and increase the mass density, which directly improves the penetration depth of the shaped charge jet without fundamentally altering the manufacturing approach.
3Length of moving object
If blends of powdered metals with higher density are used, then the penetration depth is improved, but the complexity of material composition increases
Solution Approach 1:
The patent simplifies the material composition complexity by using nanoparticle materials as a filler that can be combined with traditional liner materials in controlled ratios. The nanoparticle size parameter (1-100 nanometer scale) is the key changing parameter that enables density enhancement without requiring complex multi-component alloy systems.
Solution Approach 2:
The patent uses composite materials with a specific structure where nanoparticle fillers are distributed within a traditional liner material matrix. This composite approach allows for systematic control of density and acoustic impedance by adjusting the nanoparticle content and size, providing a more manageable complexity compared to developing entirely new high-density alloy compositions.
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 addition of nanoparticles increases the liner's density and acoustic impedance, leading to improved penetration depths and production rates by filling voids and preventing cracking during pressing, resulting in enhanced perforation performance.
Implementation Method 1
Incorporating nano-sized particles with ductility or reactivity into powdered metal mixtures to fill voids and enhance liner density and acoustic impedance
Implementation Method 2
adding substantial quantities of nano-size particles that exhibit ductility or promote ductility to prevent cracking of the liner during pressing
Implementation Method 3
adding nano-size particles that have reactive qualities to produce a secondary reaction in the perforation tunnel
Data Source
AI summary
A liner (18) for a shaped-charge (10) that is compressively formed from a mixture of powdered metal, powdered metal binder, and a selected quantity of nanoparticle material, is used to achieve improved penetration depths during perforation of a wellbore. Exemplary nanoparticles include lead, tin, copper, molybdenum, etc. Such nanoparticles increase the density, sound speed, or acoustic impedance of the liner. In another embodiment, the added nanoparticles comprise reactive materials which, after penetration into the formation, cause secondary reactions in the perforations.