High Purity Shaped Charge Liner for High Temperature Wellbore Perforation
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Solution Overview
Problem
Current shaped charge liners used in wellbore perforation suffer from imperfections and impurities that lead to non-uniform perforation jets and reduced performance, necessitating a solution that maintains mechanical integrity at high temperatures and enhances fluid flow from wellbores.
Innovation Solution
A shaped charge liner composed of high purity metal powders (≥99.5% purity) such as copper, tungsten, nickel, titanium, aluminum, lead, and molybdenum, which are compressed and heated to reduce porosity and maintain mechanical integrity at temperatures up to 250°C, forming a coherent and rapidly elongating perforation jet upon detonation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional liners with impure metal powders are used, then manufacturing cost is reduced, but the liner develops surface beads and bubbles when heated, causing non-uniform perforation jets and reduced performance
Solution Approach 1:
The patent changes the purity parameter of metal powders from conventional levels to at least 99.5%, and adjusts heating parameters to specifically sinter the liner in the 200-400°C range. This parameter change eliminates surface beads and bubbles while maintaining manufacturability through controlled heating processes.
Solution Approach 2:
The patent uses composite metal powder compositions containing multiple high-purity metals (e.g., copper, aluminum, tungsten) in specific proportions. This composite approach achieves superior sintering characteristics and jet uniformity that cannot be obtained with single metals or lower-purity alloys.
2Reliability
If the shaped charge is initiated immediately after placement, then the liner maintains mechanical integrity, but prolonged exposure to high wellbore temperatures degrades performance
Solution Approach 1:
The patent performs preliminary sintering of the liner at 200-400°C before initiation, which densifies the structure and eliminates voids. This preliminary thermal treatment allows the liner to withstand prolonged exposure to wellbore temperatures without degradation, enabling delayed initiation while maintaining reliability.
3Strength
If the liner is heated to reduce porosity, then mechanical integrity at high temperature is improved, but conventional impure liners develop surface defects that harm jet coherence
Solution Approach 1:
The patent changes the purity parameter of metal powders to at least 99.5% and controls heating parameters to the 200-400°C sintering range. This eliminates surface beads and bubbles while achieving the desired porosity reduction and mechanical integrity enhancement.
Solution Approach 2:
The patent applies different thermal treatments to different aspects of the liner: controlled sintering at 200-400°C to reduce porosity and improve strength, while the high purity composition prevents localized surface defects. The explosive composition is also locally optimized with different metals in specific zones.
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 uniform and efficient perforation jet that reduces particulation, enhancing the flow of fluids from wellbores by maintaining mechanical integrity and improving the performance of the shaped charge liner at elevated temperatures.
Implementation Method 1
heated to a temperature up to about 300° C.
Implementation Method 2
When the shaped charge liner is heated, it has a porosity level of less than about 20 volume %
Implementation Method 3
the explosive material housed within the shaped charge detonates and creates a detonation wave, which will generally cause the liner to collapse and be ejected/expelled from the shaped charge, thereby producing a forward moving perforating jet that moves at a high velocity
Implementation Method 4
The metal powders are compressed to form the shaped charge liner
Data Source
AI summary
A shaped charge liner having a plurality of metal powders including at least one high purity level metal having a purity level of at least about 99.5%. The metal powders and high purity level metal are compressed to form the shaped charge liner, and the shaped charge liner is for installation in a shaped charge. Once installed in the shaped charge, the shaped charge liner is for being thermally softened so that it has a porosity level of less than about 20 volume % and is able to maintain its mechanical integrity when thermally softened. A shaped charge including such liners is disclosed, as well as a method of perforating a wellbore using such shaped charge having such liners positioned therein.