Segmented Shaped Charge Liners for Density Gradient Control
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Solution Overview
Problem
Current manufacturing techniques for shaped charges in downhole perforating guns do not allow for intentional density variations in metal liners, limiting their effectiveness in penetrating various target materials.
Innovation Solution
The use of segmented shaped charges comprising multiple liner segments with specific characteristics, such as material, shape, size, and density gradients, allows for tailored density profiles to optimize perforation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metal powder is spun in a centrifugal die during manufacturing, then the metal liner is formed with higher density at the tip, but this limits effectiveness on softer target materials and prevents intentional density variations
Solution Approach 1:
The liner is divided into multiple segments with different density characteristics. Each segment can be manufactured separately with specific density profiles using centrifugal spinning, then assembled to create a composite liner structure. This allows intentional density variations along the liner length to optimize performance on different target materials.
Solution Approach 2:
Different portions of the liner are given different density properties to suit specific penetration requirements. The tip region can have higher density for hard targets while the base region has lower density for softer targets, creating localized density optimization rather than uniform density throughout the entire liner.
2Strength
If density at the tip of the liner is increased, then velocity and momentum of the jet improve for penetrating hard target materials, but effectiveness on softer target materials decreases
Solution Approach 1:
The liner density profile can be dynamically optimized for different operational scenarios. By using segmented construction, the same liner assembly can be configured with different density distributions depending on the target material, allowing the system to adapt its penetration characteristics to match the specific application requirements.
Solution Approach 2:
The density parameter of the liner is changed in specific regions to optimize jet formation for different target materials. By controlling the density distribution along the liner length, the velocity and momentum characteristics of the resulting jet can be tuned to match the mechanical properties of the target material being penetrated.
3Ease of manufacture
If current manufacturing techniques are used, then production is simple and cost-effective, but intentional density variations in the liner cannot be achieved
Solution Approach 1:
The manufacturing process is segmented into separate steps for different liner portions. Each segment can be manufactured using standard centrifugal spinning techniques that are already proven and cost-effective, then assembled together. This approach maintains the simplicity and cost-effectiveness of existing manufacturing while enabling density variations through the segmentation strategy.
Solution Approach 2:
Different density characteristics are built into the liner segments during the manufacturing process itself, rather than requiring post-manufacturing modifications. The centrifugal spinning process is used to create segments with predetermined density profiles, which are then assembled to achieve the desired overall density distribution.
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
Enables enhanced perforation capabilities by adjusting density gradients along the liner segments, improving penetration efficiency in different downhole materials.
Implementation Method 1
rotating the die drives the metal powder out and up along an inner wall of the die
Implementation Method 2
pressing the punch into the die compacts the metal powder along the inner wall of the die to form a liner segment
Implementation Method 3
the shaped charges are detonated. The detonation perforates the casing string, the cementing, and the subterranean formation
Implementation Method 4
shaped charges include an explosive material that expels a metal liner outward in a jet to perforate a target material
Data Source
AI summary
A shaped charge liner may include a plurality of liner segments for a shaped charge configured to perforate a sidewall of a wellbore upon detonation. The plurality of liner segments may include a tip liner segment comprising a first group of compacted metal powder having a hollow cone shape with a trailing interface end disposed opposite a tip end. The tip liner segment is configured to be disposed in a shaped charge casing of the shaped charge. The plurality of liner segments may also include a base liner segment comprising a second group of compacted metal powder having a truncated hollow cone shape with a trailing base end disposed opposite a leading base interface end. The trailing base end has a larger diameter than the leading base interface end, and the base liner segment is configured to be disposed at least partially within the shaped charge casing.