Shaped Charge Tubing Cutter Booster Integration

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Solution Overview

Problem

Traditional shaped charge pipe cutters face challenges with densely compressed high explosives requiring larger boosters, which complicate downhole tubing cutter design and introduce safety concerns due to increased detonation difficulty and the need for larger apertures, while also being prone to leaks and assembly issues in hostile drilling environments.

Innovation Solution

The design compresses explosive material intimately around a core mandrel to form an axial aperture, eliminating the need for a separate booster and incorporating a fluid seal element to prevent moisture ingress, with a detonator initiating the charge from a common plane and a heavy wall boss protecting against asymmetric detonation, allowing for a smaller aperture diameter and improved sealing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If densely compressed high explosives are used to increase detonation velocity and cutting pressure, then cutting performance is improved, but the booster size must be increased and assembly complexity increases

Engineering Contradiction:

Improvecutting pressureVSAvoidbooster assembly complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The patent integrates the booster and detonator into a single unified assembly unit. The detonator is positioned within the booster structure, eliminating the need for separate booster installation steps and reducing assembly complexity while maintaining the high cutting pressure from densely compressed explosives

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The heavy wall boss structure serves as an intermediary component that channels and focuses the detonation energy from the booster-detonator assembly to the explosive charge, ensuring efficient energy transfer and consistent detonation initiation without requiring complex positioning mechanisms

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If larger boosters are used to detonate densely compressed explosives, then detonation reliability is improved, but the aperture diameter must be increased and device compactness deteriorates

Engineering Contradiction:

Improvedetonation reliabilityVSAvoidaperture diameter

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent optimizes the booster and aperture dimensions to specific parameter ranges that maintain reliable detonation initiation for densely compressed explosives while minimizing the aperture diameter. The heavy wall boss geometry is specifically designed to concentrate detonation energy, allowing smaller apertures to achieve the same reliability as larger ones

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If traditional assembly procedures are used in hostile drilling environments, then manufacturing simplicity is maintained, but leak risk and assembly reliability increase

Engineering Contradiction:

Improveassembly simplicityVSAvoidsealing reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The cutter components are pre-assembled into a integrated housing unit with sealed compartments before deployment to the drilling site. The detonator and explosive charge are pre-positioned within the housing with sealed barriers, eliminating the need for complex field assembly operations in hostile environments and preventing moisture ingress

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent incorporates sealed barriers and protective housings around the explosive and detonator components before exposure to hostile environments. These pre-installed protective measures cushion against moisture, pressure, and contamination, ensuring reliable operation without requiring complex field sealing procedures

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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

This solution enhances the reliability and safety of shaped charge cutters by reducing the booster size, minimizing the risk of leaks, and ensuring consistent detonation, while simplifying assembly and reducing fabrication costs.

Implementation Method 1

compresses explosive material intimately around a core mandrel to form an axial aperture

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 2

a detonator initiating the charge from a common plane

Methodology Applied

Scientific EffectDetonation: Detonation

Implementation Method 3

the explosive shock wave advances radially along the apex plane against the V-groove liner

Methodology Applied

Scientific EffectShock Wave: Shock Wave

Implementation Method 4

incorporating a fluid seal element to prevent moisture ingress

Methodology Applied

Scientific EffectFluid barrier sealing: Liquid Membrane

Data Source

PatentUS10047591B2Apparatus and methods for shaped charge tubing cutters

Publication Date: 2018.08.14 W T BELL INT INC

AI summary

A shaped charge pipe cutter is constructed with the cutter explosive material packed intimately around an axially elongated void space that is continued through a heavy wall boss portion of the upper thrust disc. The boss wall is continued to within a critical initiation distance of a half-cuter junction plane. An explosive detonator is positioned along the void space axis proximate of the outer plane of the upper thrust disc. Geometric configurations of the charge thrust disc and end-plate concentrate the detonation energy at the critical initiation zone.