Perforating Gun Charge Tube Orientation Detection Before Firing

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Solution Overview

Problem

In tubing conveyed perforating, determining the independent orientation and motion of charge tubes in a perforating gun system is challenging, as improper orientation can lead to costly misfires and damage due to explosions in unintended directions.

Innovation Solution

A perforating gun system with a charge tube that self-orientates using gravitational forces and counterweights, equipped with a stationary emitter and sensor to detect orientation via acoustic signals, ensuring correct alignment before firing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If charge tubes are installed on free rotation devices to allow self-orientation, then the system becomes more adaptable to different orientations, but it becomes difficult to determine the real-time orientation and motion of the charge tubes

Engineering Contradiction:

Improveself-orientation capabilityVSAvoidreal-time orientation detection

Core Design Contradiction:

Adaptability or versatilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent introduces an acoustic emitter attached to the charge tube and an acoustic sensor on the gun carrier as intermediary detection elements. The emitter generates acoustic signals that are detected by the sensor, creating a mediator system that bridges the gap between the rotating charge tube and the stationary detection system. This allows real-time orientation tracking without constraining the charge tube's free rotation capability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces direct mechanical orientation detection (which would require physical connections between the rotating charge tube and the detection system) with an acoustic field-based detection system. The acoustic emitter and sensor create a non-contact measurement system that substitutes mechanical coupling with acoustic signal transmission, enabling orientation detection while preserving the charge tube's independent rotation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If charge tubes are set to a fixed position before downhole placement, then orientation precision is improved, but the system loses adaptability to gravitational self-alignment in deviated wells

Engineering Contradiction:

Improveorientation precisionVSAvoidgravitational self-alignment

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent performs preliminary orientation detection before firing by using the acoustic emitter and sensor system to monitor charge tube orientation in real-time during the downhole operation. This preliminary detection allows verification that gravitational self-alignment has achieved the desired orientation before the perforation event occurs, ensuring precision without requiring fixed pre-setting

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The acoustic detection system provides real-time feedback on charge tube orientation during the operation. The sensor detects acoustic signals from the emitter, and this information can be used to verify that the charge tube has properly self-aligned with gravity before firing, creating a feedback loop that ensures orientation precision while maintaining adaptability

Inventive Principle:

Principle #23Feedback

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

Enables real-time evaluation of charge tube orientation, reducing the risk of misfires and damage by confirming proper orientation before detonation, thereby optimizing the perforating process.

Implementation Method 1

charge tubes that orient independently of a rotation of a gun carrier, such that the charge tube can self-orient when the perforating gun system is downhole

Methodology Applied

Scientific EffectGravitation: Gravitation

Implementation Method 2

determine the orientation and/or motion, in real time, of the charge tube using an emitter and one or more sensors before firing the charge tube

Methodology Applied

Scientific EffectAcoustic signal detection: Acoustics

Data Source

PatentUS12612844B2Systems and methods for real time oil tool orientation detection

Publication Date: 2026.04.28 HALLIBURTON ENERGY SERVICES INC

AI summary

A perforating gun system for tubing conveyed perforation is provided. The perforating gun system includes a gun carrier, at least one free rotation device, a charge tube suspended on the at least one free rotation device, a stationary emitter coupled to the charge tube, and a sensor coupled to an interior surface of the gun carrier. The sensor can be configured to intermittently align with the stationary emitter when the charge tube is orienting independently of the rotation of the gun carrier.