Tri-angled Liner Jet Shaper for Consistent Perforation
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Solution Overview
Problem
Standard shaped charges used for perforating wells in horizontal wells often result in inconsistent hole sizes due to varying fluid clearances, and existing solutions like mechanical centralizers increase the risk of tool string sticking.
Innovation Solution
A shaped charge liner with a unique frustoconical geometry, comprising multiple intersecting portions, is designed to shape the explosive jet and maintain a consistent entry hole size by disrupting its formation, preventing collapse at large fluid clearances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If standard shaped charges are used for perforating horizontal wells, then the perforation process is simple, but the hole size varies drastically due to fluid clearance variations
Solution Approach 1:
The liner is divided into multiple frustoconical portions (first, second, third frustoconical portions) with different angles, where each segment serves a specific function in shaping and stabilizing the explosive jet to achieve consistent hole sizes despite fluid clearance variations
Solution Approach 2:
Different sections of the liner have different frustoconical angles tailored to specific functions: the first portion (40-70 degrees) initiates jet formation, the second portion (80-110 degrees) shapes the jet, and the third portion (50-90 degrees) stabilizes the jet, with each local geometry optimized for its specific role in achieving consistent perforation
2Manufacturing precision
If mechanical centralizers are used to minimize fluid clearance variations, then hole size consistency is improved, but the risk of tool string sticking increases
Solution Approach 1:
The invention extracts and eliminates the need for mechanical centralizers by incorporating the clearance compensation function directly into the liner geometry itself, allowing the liner to adapt to varying fluid clearances through its multi-section frustoconical design without requiring additional centralizing equipment
Solution Approach 2:
The multi-section frustoconical liner acts as an intermediary between the explosive charge and the formation, mediating the effect of fluid clearance variations by shaping and stabilizing the explosive jet to compensate for clearance changes, thereby achieving consistent hole sizes without mechanical centralizers
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 solution ensures a consistent entry hole size in well casings, reducing the risk of tool string sticking and improving perforation efficiency in horizontal wells.
Implementation Method 1
A shaped charge is a term of art for a device that when detonated generates a focused output, high energy output, and/or high velocity jet
Implementation Method 2
Explosively perforating the formation using a shaped charge is a widely known method for completing an oil well
Implementation Method 3
the bottom portion shapes the explosive jet during detonation to achieve a consistent entry hole size in a well casing
Data Source
AI summary
A shaped charge having a liner with three frustoconical segments and a bottom portion configured to provide consistent perforating holes over a range of distances from the shaped charge.