Shaped Charge Reactive Materials for Dynamic Overbalance
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Solution Overview
Problem
Current perforating technologies face challenges in generating sufficient dynamic overbalance in wellbores, particularly in gas-filled environments, which limits the creation of deeper and larger perforation tunnels necessary for effective fracturing and acid treatment in formations like Sandstone and Carbonate.
Innovation Solution
Incorporating reactive materials such as Ti, Al, Mg, Zn, Sn, and oxidizers into shaped charges to generate heat and increase pressure upon detonation, creating a transient overbalance condition that enhances perforation depths and widths, regardless of the wellbore fluid composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If conventional shaped charges are used in gas-filled wellbores, then the perforation operation can be performed, but sufficient dynamic overbalance cannot be generated to create deeper and larger perforation tunnels
Solution Approach 1:
The patent changes the physical-chemical parameters of the shaped charge by incorporating reactive materials (metal powders such as Ti, Al, Mg, Zn, Sn and oxidizers) that undergo exothermic reactions during detonation. This chemical parameter change generates additional heat and pressure, creating transient dynamic overbalance in gas-filled wellbores, which enables the formation of deeper and larger perforation tunnels while maintaining reliability across different wellbore fluid compositions.
2Productivity
If reactive materials are incorporated into shaped charges to generate heat and pressure, then deeper and larger perforation tunnels can be created, but the device complexity increases
Solution Approach 1:
The patent applies composite materials by combining conventional explosive with reactive materials (metal powders and oxidizers) within the shaped charge structure. This composite approach integrates multiple functional components into a single unified charge system, where the metal powders and oxidizers are dispersed throughout the explosive matrix. This allows the shaped charge to generate both mechanical detonation force and thermal energy from exothermic reactions, achieving deeper perforation tunnels without requiring separate external heating or pressurization systems, thus managing device complexity through material integration rather than system addition.
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 use of reactive materials in shaped charges effectively generates deeper and larger perforation tunnels, improving productivity in various formations by maintaining dynamic overbalance, even in gas-filled wellbores, and facilitating better fracturing and acid treatment outcomes.
Implementation Method 1
reactive materials such as Ti, Al, Mg, Zn, Sn, and oxidizers into shaped charges to generate heat and increase pressure upon detonation
Implementation Method 2
detonating a shaped charge in the perforation gun... generate deeper and larger perforation tunnels
Data Source
AI summary
A shaped charge includes a cup-shaped casing defining an interior volume; a liner located within the interior volume; an explosive disposed between the liner and the casing; and a reactive material disposed between the liner and the casing. A method for generating a dynamic overbalance inside a wellbore includes disposing a perforation gun in the wellbore; and detonating a shaped charge in the perforation gun, wherein the shaped charge includes a cup-shaped casing defining an interior volume, a liner located within the interior volume, an explosive disposed between the liner and the casing, and a reactive material disposed between the liner and the casing.