Tandem Sub Electrical Pass-Thru for Perforating Guns
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Solution Overview
Problem
Existing perforating gun systems face challenges in ensuring reliable electrical connections and pressure isolation between perforating guns, which can lead to inefficiencies and potential safety issues during well completion operations.
Innovation Solution
The development of a tandem sub for perforating gun systems, featuring a tubular housing with a central passage and an electrical pass-thru assembly. This assembly includes an electrically conductive signal bar and a surrounding insulator, designed to establish reliable electrical connections while maintaining pressure isolation through a radial gap and annular seal assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrical pass-thru assembly is installed in the tandem sub, then reliable electrical connections are established, but the risk of short circuits and pressure isolation failures increases
Solution Approach 1:
An electrically insulating material is introduced as an intermediary substance between the signal bar and the housing to prevent electrical short circuits while maintaining mechanical stability of the electrical pass-thru assembly
Solution Approach 2:
The tandem sub is divided into functionally segmented zones: a central passage for pressure isolation, an annular receptacle for the electrical pass-thru assembly, and a radial gap zone for insulation, allowing each component to independently fulfill its specific function
2Object-affected harmful factors
If a radial gap is formed between the insulator and housing, then short circuit prevention is improved, but the structural compactness and sealing reliability may deteriorate
Solution Approach 1:
An electrically insulating material is placed in the radial gap to maintain electrical isolation while preventing fluid communication, serving as a dual-function intermediary that addresses both electrical and pressure isolation requirements
Solution Approach 2:
The radial gap is created locally in the annular receptacle region specifically for electrical isolation purposes, while the seal bore region maintains full contact for pressure sealing, allowing different local zones to have different structural qualities optimized for their specific functions
3Reliability
If the signal bar is rigid along the entire longitudinal length, then electrical signal transmission is improved, but the assembly complexity and manufacturing difficulty increase
Solution Approach 1:
The signal bar serves multiple functions simultaneously: it provides rigid electrical signal transmission along its longitudinal length, while its longitudinal ends provide electrical contacts for connection to external components, eliminating the need for separate contact components
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 tandem sub enables reliable electrical signaling and pressure isolation between perforating guns, enhancing the efficiency and safety of well completion operations by preventing short circuits and ensuring controlled detonation of shaped charges.
Implementation Method 1
an electrical insulator surrounding a periphery of the signal bar
Implementation Method 2
a radial gap is formed between the outer surface of the insulator and a portion of the inner surface of the housing defining the receptacle
Implementation Method 3
a seal bore defining a minimum inner diameter of the central passage
Data Source
AI summary
A method for forming a tandem sub for a perforating gun system includes forming a tubular housing including a longitudinal first end, a longitudinal second end opposite the first end, a central passage defined by an inner surface that forms a seal bore defining a minimum inner diameter of the central passage and an annular receptacle, wherein the housing is connectable to an outer housing of a perforating gun, and installing a pass-thru assembly including an electrically conductive signal bar and a surrounding electrical insulator in the central passage of the housing whereby a radial gap is formed between an outer surface of the insulator of the pass-thru assembly at a longitudinal end of the pass-thru assembly and a portion of the inner surface of the housing defining the receptacle.