Perforating Gun Barrel Thread Orientation for Scallop Alignment

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Solution Overview

Problem

Existing methods for orienting perforating gun barrels in desired configurations are inefficient and may lead to misalignment of scallops, which can cause safety issues and increase manufacturing costs due to the need for lock rings and complex alignment processes, especially with pin-to-pin electrical connections.

Innovation Solution

The method involves machining gun barrels and sub bodies with threads positioned at specific angles (0° or 180°) to ensure aligned scallops and simplify the alignment process, eliminating the need for lock rings and reducing the overall length of the gun string.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional alignment methods are used for gun barrels, then manufacturing flexibility is maintained, but alignment precision deteriorates leading to scallop misalignment

Engineering Contradiction:

Improvescallop alignment precisionVSAvoidalignment process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The threads on gun barrels and sub bodies are pre-machined at specific angular positions (0° or 180°) to automatically ensure proper alignment when assembled. This preliminary positioning action eliminates the need for complex alignment procedures during assembly, as the threads guide the components into the correct orientation automatically.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The alignment system uses self-aligning threaded connections where the gun barrels and sub bodies automatically orient themselves correctly through the threaded engagement mechanism. The threads are designed so that proper alignment is inherent in the assembly process itself, without requiring external alignment tools or procedures.

Inventive Principle:

Principle #25Self-service

2Reliability

If lock rings are used to secure gun barrels, then connection reliability is improved, but device length increases and manufacturing cost increases

Engineering Contradiction:

Improveconnection reliabilityVSAvoidgun string length

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The lock ring component is completely removed from the design. Instead of using separate lock rings to secure the gun barrels to the sub bodies, the threaded connection itself provides sufficient mechanical engagement and electrical connection, eliminating the need for additional securing components.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The mechanical connection and electrical connection functions are merged into a single threaded interface. The threaded engagement between gun barrels and sub bodies simultaneously provides both structural support and electrical continuity, eliminating the need for separate lock rings that would add length and complexity.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If lock rings are used for electrical connections, then connection stability is improved, but manufacturing cost increases

Engineering Contradiction:

Improveelectrical connection stabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The mechanical fastening and electrical connection functions are combined into a single threaded interface. The threaded engagement provides both structural support and continuous electrical contact through the engaged components, eliminating the need for separate lock rings with electrical contacts, thereby reducing manufacturing cost while maintaining connection stability.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12480387B2Methods and devices for orienting perforated guns

Publication Date: 2025.11.25 STEEL DOG IND INC

AI summary

Methods and devices for orienting multiple gun barrels in desired directions and configurations have the locking threads of the gun barrels and the sub bodies placed in specified locations. Thus, when the sub body and the two gun barrels are joined to each other, the scallops of the two gun barrels will be aligned with each other.