Sealed Detonation System Tandem Sub for Perforating Guns
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Solution Overview
Problem
Current detonation systems for perforating gun assemblies face challenges in maintaining reliable electrical connections and protecting electronics within tandem subs from wellbore fluids and debris generated by explosive charges, leading to frequent component damage and increased operational costs.
Innovation Solution
A detonation system featuring a tandem sub with an addressable switch housed within, utilizing signal transmission pins and end plates to mechanically and fluidically seal the sub from wellbore fluids and debris, allowing pre-assembled wiring connections and protected electronics during detonation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronics are housed within the tandem sub, then electrical connections and signal transmission are improved, but the electronics are exposed to wellbore fluids and debris from detonation
Solution Approach 1:
The tandem sub is divided into separate functional zones: an electronics housing containing the addressable switch and control electronics, and a detonation chamber for the explosive charge. This segmentation isolates the electronics from the harsh detonation environment while maintaining electrical connectivity through sealed pathways.
Solution Approach 2:
A sealed housing acts as an intermediary barrier between the electronics and the wellbore environment. The housing includes sealed openings with protective structures that allow electrical signal transmission while blocking direct exposure to wellbore fluids and debris generated during detonation.
2Object-affected harmful factors
If the tandem sub is sealed to protect electronics, then protection from wellbore fluids is improved, but electrical connection and signal transmission may be compromised
Solution Approach 1:
The housing provides selective sealing: it is sealed against wellbore fluids in the bulk, but includes localized openings and conduits specifically designed for electrical signal transmission. The sealed openings are positioned and configured to allow electrical connectivity while maintaining overall protection from harmful fluids.
3Ease of manufacture
If pre-assembled wiring connections are used, then ease of assembly is improved, but protection from detonation debris is reduced
Solution Approach 1:
The electrical connection components and protective housing are merged into a single integrated assembly. The addressable switch, wiring connections, and sealed housing are pre-assembled as one unit, allowing the entire protection system to be installed simultaneously while maintaining both ease of assembly and protection from detonation debris.
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
The system ensures reliable and reusable electrical connections and protected electronics, reducing the need for frequent replacement and maintenance, thereby enhancing operational efficiency and cost-effectiveness.
Implementation Method 1
an explosive charge is detonated in a carrier tube of the perforating gun assembly
Implementation Method 2
the detonation of charges from an associated perforating gun
Implementation Method 3
a high-velocity jet of cold gas is generated by the detonation of charges
Implementation Method 4
the jet impinges upon a wellbore wall and erodes a jet inlet hole
Implementation Method 5
the jet flows through the formed hole and impinges upon a target formation
Implementation Method 6
a cavity is formed in the target formation by the jet through erosion and implosion
Data Source
AI summary
A detonation system for a perforating gun assembly. The detonation system includes a tandem sub having a first end and a second opposing end. Each of the first and second ends is connected to a respective perforating gun. The tandem sub has an inner bore, and a switch housing residing within the inner bore. The tandem sub also has an addressable switch residing within the switch housing with the switch being configured to receive instruction signals from a surface by means of an electric line. The addressable switch is in communication with a signal transmission pin and a detonator pin. The detonator pin sends a detonation signal from the addressable switch to a detonator in an adjacent perforating gun. The wiring connections for the pins may be pre-assembled before the perforating guns are delivered to the field. The detonation system utilizes a carrier end plate, wherein the end plate and pins seal off the tandem sub from wellbore fluids and debris following detonation of explosive charges in an associated perforating gun.