Shaped Charge Jet Blocker for Controlled Wellbore Perforation
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Solution Overview
Problem
Existing wellbore perforation technologies often result in excessive penetration through multiple casing and geologic layers, failing to provide controlled perforations that promote fluid flow in specific annular regions, which limits the efficiency of hydrocarbon extraction.
Innovation Solution
A shaped charge with a jet blocker made of inert materials like epoxy or flowable plastic is inserted into the apex of a parabolic or cone-shaped liner, limiting the velocity and length of the jet formed upon detonation, thereby controlling the penetration depth and extent of perforations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large explosive charge is used to create large perforations, then hydrocarbon permeability is improved, but penetration through all casing layers occurs which prevents controlled fluid flow in specific annular regions
Solution Approach 1:
The liner is segmented into multiple sections with different thicknesses, creating zones of varying resistance to jet penetration. The jet blocker is positioned at a specific segment to terminate penetration at a controlled depth, allowing perforations to extend through some casing layers while stopping before penetrating others, thus enabling selective annular region access.
Solution Approach 2:
A jet blocker is introduced as an intermediary element within the shaped charge assembly. This blocker acts as a mediator that intercepts the jet at a predetermined location, limiting penetration depth while preserving the jet's energy to create effective perforations in target annular regions without compromising the structural integrity of deeper casing layers.
2Length of moving object
If a jet blocker is inserted into the liner apex, then penetration depth is controlled, but the complexity of the shaped charge assembly increases
Solution Approach 1:
The jet blocker is nested within the existing shaped charge assembly, specifically positioned in the apex region of the liner. This nesting approach integrates the penetration control function within the existing structural framework without requiring separate external components, thereby minimizing the increase in overall assembly complexity while achieving precise penetration depth control.
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 allows for precise perforation of target annuli without penetrating all casing layers, enhancing hydrocarbon flow by creating controlled passageways with reduced energy impact on the wellbore structure, thus optimizing wellbore completion operations.
Implementation Method 1
The shaped charge includes a jet blocker disposed in an apex of a parabolic or cone-shaped liner, which limits the velocity or length of a jet that forms upon discharging an explosive in the shaped charge
Implementation Method 2
a jet blocker disposed in an apex of a parabolic or cone-shaped liner, which limits the velocity or length of a jet that forms upon discharging an explosive
Data Source
AI summary
A shaped charge for use in a well perforating tool includes a jet blocker disposed in an apex of a parabolic or cone-shaped liner. The jet blocker limits the velocity and/or length of a jet that forms upon discharging an explosive in the shaped charge. The jet blocker may include an inert cast-cure type of material such as an epoxy or a flowable plastic that can be readily inserted into an existing shaped charge to fill an external concavity in the liner to any desired height. The height and material selected for the jet blocker determines the degree to which the penetration achieved by the shaped charge is limited, and thus, determines which targeted annulus in the wellbore may be penetrated in operation.