Multi-Position Switch for Downhole Perforating Gun Control
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Solution Overview
Problem
The increasing number of switches in perforating strings used in wellbore operations increases the likelihood of electrical failures downhole, compromising the reliability of perforating and setting tools.
Innovation Solution
A perforating gun with a switch that actuates between multiple positions to transmit power to either a detonator for explosive charges or a pyrotechnic device for actuating a plug, reducing the need for intermediate switches and minimizing electrical failures by integrating the switch and pyrotechnic devices within the gun's carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple switches are used in the perforating string to control different functions, then the control capability and functionality are improved, but the reliability deteriorates due to increased likelihood of electrical failures
Solution Approach 1:
The patent combines multiple switch functions into a single multi-position switch located in the upper perforating gun. This single switch can connect to different downstream switches in lower guns or in the setting tool, allowing one switch to perform the work of multiple switches while reducing the total number of electrical connection points and potential failure sites in the system.
Solution Approach 2:
The upper gun's switch is designed as a universal control point that can route electrical connections to multiple different destinations depending on its position. It can connect to switches in lower guns for perforation control or to the setting tool for plug setting control, making a single component perform multiple control functions that previously required separate switches distributed throughout the string.
2Ease of operation
If multiple switches are distributed throughout the perforating string, then the operational control is improved, but the device complexity increases
Solution Approach 1:
The patent consolidates the control architecture by merging multiple distributed switches into a single centralized switch in the upper gun. This simplifies the device structure by eliminating redundant switch components and their associated wiring harnesses, while the multi-position design maintains the ability to control different operational sequences and functions.
Solution Approach 2:
The upper gun's switch acts as an intermediary control point that mediates between the surface computing system and various downstream components. Instead of having multiple independent switches throughout the string, this single intermediary switch routes electrical connections to different downstream switches or the setting tool based on operational requirements, simplifying the overall system architecture.
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 of downhole operations by reducing the risk of electrical failures and simplifying the communication between surface computing systems and downhole tools, ensuring consistent and controlled actuation of explosive charges and plug settings.
Implementation Method 1
The detonator detonates the explosive charge when the detonator receives power
Implementation Method 2
The pyrotechnic device detonates or deflagrates when the pyrotechnic device receives power
Data Source
AI summary
A perforating gun includes a carrier, an explosive charge positioned within the carrier, a detonator positioned within the carrier, and a switch positioned within the carrier. The detonator detonates the explosive charge when the detonator receives power. The switch actuates between at least a first position and a second position. The switch transmits power to the detonator when the switch is in the first position, and the switch transmits power to a pyrotechnic device when the switch is in the second position. The pyrotechnic device detonates or deflagrates when the pyrotechnic device receives power.