Shaped Charge Liner Apex Thickness for Jet Penetration
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Solution Overview
Problem
Traditional shaped charge designs for oil well perforation do not fully utilize the explosive material and liner to achieve maximum jet penetration, leading to inefficiencies in hydrocarbon production due to reverse gradient axial velocity and waste of liner material.
Innovation Solution
A shaped charge design with a liner having an apex portion with a cross-sectional thickness at least fifty percent thicker and higher material density than other portions, and a distribution of explosive material to reduce pressure at the apex, promoting a neutral or positive velocity gradient for enhanced jet formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional shaped charge designs with uniform liner thickness are used, then the charge structure is simple and easy to manufacture, but the jet penetration depth and velocity are limited due to reverse gradient axial velocity
Solution Approach 1:
The liner is designed with non-uniform thickness, featuring an apex portion with greater thickness than the skirt portion. This local variation in geometry creates a positive velocity gradient in the jet, with the thicker apex portion generating higher velocity material that travels ahead, while the thinner skirt portion generates lower velocity material that follows, eliminating the reverse gradient problem and achieving deeper penetration.
Solution Approach 2:
The liner geometry transitions from a symmetric uniform thickness design to an asymmetric design where the apex portion has a different thickness than the skirt portion. This asymmetry is intentionally created to control the velocity distribution within the jet, ensuring that the leading portion of the jet has higher velocity than the trailing portion, thereby maximizing penetration depth.
2Productivity
If traditional shaped charge designs with standard explosive distribution are used, then the charge is easy to manufacture, but the explosive material is not fully utilized and jet velocity is reduced
Solution Approach 1:
The explosive material is distributed non-uniformly within the charge, with varying densities in different regions. Specifically, the explosive density is adjusted to create appropriate pressure gradients that complement the non-uniform liner thickness, ensuring optimal energy utilization throughout the jet formation process and maximizing hydrocarbon production efficiency.
3Stability of the object's composition
If traditional shaped charge designs are used, then the charge structure is simple, but liner material is wasted and jet coherence is reduced
Solution Approach 1:
By concentrating the majority of the liner mass in the apex portion (the leading edge of the jet), the design ensures that the most critical part of the jet has sufficient material to maintain coherence and velocity. The reduced mass in the skirt portion minimizes material waste while still providing necessary structural support, thereby improving jet coherence and reducing overall liner material waste.
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 design results in a longer jet with higher tip axial velocity, deeper penetration, and increased hydrocarbon production by maintaining a cohesive jet structure and reducing the reverse velocity gradient, allowing for more efficient fluid flow.
Implementation Method 1
When the explosive material is detonated, a compressive shock wave is generated which collapses the liner
Implementation Method 2
a compressive shock wave is generated which collapses the liner
Implementation Method 3
The inner portion of the liner is extruded into a narrow diameter high-speed jet which perforates the casing
Data Source
AI summary
An apparatus and method for perforating a subterranean formation is disclosed. The apparatus includes a tubular carrier; a charge tube disposed in the tubular carrier; and at least one shaped charge mounted in the charge tube which includes a casing, an explosive material and a liner enclosing the explosive material within the casing. An apex portion of the liner has a cross-sectional thickness greater than a cross-sectional thickness of any other portion of the liner. The cross-sectional thickness of the apex portion may be at least fifty percent thicker than a cross-section of a portion adjacent the apex portion. A density of the apex portion may be greater than the density of any other portions of the liner.