Perforating Gun Endplate Material Segmentation

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Solution Overview

Problem

Current perforating guns used in wellbore completion systems face challenges in efficiently coupling explosive shaped charges and ensuring reliable electrical conduction for detonation, particularly in the design and materials used for endplates and charge tubes, which can lead to suboptimal performance and increased costs.

Innovation Solution

The design incorporates endplates with distinct materials for the faceplate and body, where the faceplate is electrically conductive and the body is electrically insulating, with features like ground springs, alignment tabs, and ports to ensure proper alignment and electrical conduction, reducing the need for expensive materials while maintaining effective detonation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If expensive materials are used for endplates and charge tubes, then reliability of detonation is improved, but manufacturing cost increases

Engineering Contradiction:

Improvereliability of detonationVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The endplate is designed with different materials for different regions: the faceplate portion uses electrically conductive material for reliable electrical contact with the detonator, while the body portion uses less expensive material. This local differentiation allows the expensive conductive material to be used only where it is functionally necessary for detonation reliability, rather than throughout the entire endplate structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The endplate is constructed as a composite structure combining electrically conductive material (such as copper or aluminum) with less expensive structural material. This composite approach allows the assembly to achieve both electrical conductivity requirements for reliable detonation and cost reduction through the use of cheaper materials in non-conductive regions.

Inventive Principle:

Principle #40Composite materials

2Reliability

If electrically conductive material is used for the entire endplate, then electrical conduction for detonation is ensured, but material cost increases

Engineering Contradiction:

Improveelectrical conductionVSAvoidmaterial cost

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The faceplate of the endplate is specifically designed with electrically conductive material to ensure reliable electrical contact with the detonator, while the body portion can use less expensive material. This localized application of conductive material ensures electrical conduction reliability only where needed, reducing overall material costs.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If simple endplate design is used, then manufacturing cost is reduced, but alignment precision of charge tube deteriorates

Engineering Contradiction:

Improvemanufacturing costVSAvoidalignment precision of charge tube

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

Alignment tabs are integrated into the endplate design to pre-establish proper alignment of the charge tube relative to the detonator before the final assembly step. These tabs protrude into the charge tube to prevent misalignment, ensuring that the charge tube is correctly positioned and oriented during assembly without requiring complex alignment procedures or additional adjustment steps.

Inventive Principle:

Principle #10Preliminary action

4Device complexity

If integrated endplate design is used, then device complexity is reduced, but ease of manufacture deteriorates due to material joining requirements

Engineering Contradiction:

Improvedevice complexityVSAvoidease of manufacture

Core Design Contradiction:

Device complexityVSEase of manufacture

Solution Approach 1:

The endplate is divided into separate components: a faceplate made of electrically conductive material and a body made of less expensive material. These segmented components are manufactured separately and then joined together, allowing each component to be optimized for its specific function and material requirements while maintaining overall structural integrity and electrical conductivity.

Inventive Principle:

Principle #1Segmentation

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 configuration enhances the reliability and efficiency of detonation in perforating guns by ensuring proper electrical conduction and alignment, while also reducing costs through the use of less expensive materials for the body components.

Implementation Method 1

the first faceplate comprises a ground spring that extends from the annular surface of the first faceplate

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

a charge tube configured to receive an explosive shaped charge

Methodology Applied

Scientific EffectDetonation: Detonation

Implementation Method 3

explosive shaped charge

Methodology Applied

Scientific EffectShaped charge: Shaped Charge

Data Source

PatentUS10669821B2Charge tube assembly

Publication Date: 2020.06.02 G&H DIVERSIFIED MFG LP

AI summary

A charge tube assembly for a perforating gun includes a charge tube configured to receive an explosive shaped charge, and a first endplate configured to couple to a first end of the charge tube, the first endplate including a first faceplate coupled to a first body, wherein the first faceplate includes a first material and the first body includes a second material that is different from the first material.