Helical Coil Inductive Coupler for Downhole Data Transmission
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Solution Overview
Problem
Existing downhole data communication systems face challenges in reliability due to harsh environments, including moisture, noise, vibrations, and high temperatures, which affect the performance of electronic equipment used in oil and gas well drilling.
Innovation Solution
A data transmission system for wired drill pipes utilizing a composite annular polymeric block with a magnetically conductive electrically insulating ferrite channel and helical electrical conductors, which includes a coaxial cable connection to enhance signal transmission and reduce electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electronic equipment is used for data communication downhole, then basic data transmission can be achieved, but reliability deteriorates due to harsh environment (moisture, noise, vibrations, high temperatures)
Solution Approach 1:
The patent employs a composite structure consisting of a helical conductor (copper wire) wound around a ferrite core. The ferrite material provides magnetic conductivity for signal transmission while being electrically insulating, creating a composite system that maintains signal integrity in harsh environments. This composite approach allows the system to withstand moisture, vibrations, and high temperatures while maintaining reliable data communication.
Solution Approach 2:
The ferrite channel acts as an intermediary between the electrical conductor and the external environment. It confines and guides the magnetic field generated by the helical conductor, preventing electromagnetic interference with surrounding components and protecting the system from external electromagnetic noise. This intermediary structure isolates the sensitive electrical components from the harsh downhole environment.
2Speed
If inductive coupling is implemented for high-speed data communication, then data transmission speed improves, but electromagnetic interference and signal loss increase in harsh environments
Solution Approach 1:
The ferrite channel provides localized magnetic conductivity exactly where needed - within the annular groove of the drill pipe shoulder. This concentrated magnetic path confines the electromagnetic energy to a specific region, enhancing coupling efficiency between adjacent drill pipe sections while minimizing electromagnetic radiation and interference with surrounding components. The local quality of magnetic conductivity in the ferrite channel optimizes signal transmission without generating harmful electromagnetic effects.
3Device complexity
If a simple conductor is used for inductive coupling, then device complexity is reduced, but signal transmission performance and resistance to electromagnetic interference deteriorate
Solution Approach 1:
The helical conductor is nested within the annular ferrite channel, which itself is embedded in the polymeric block that fits into the drill pipe's annular groove. This nested structure integrates multiple functions into a compact form: the inner conductor provides electrical signal transmission, the middle ferrite layer provides magnetic confinement and electrical insulation, and the outer polymeric block provides mechanical support and environmental protection. This nesting achieves high reliability without proportionally increasing device complexity.
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 provides reliable high-speed data communication by minimizing signal loss and interference, ensuring effective data transfer in harsh downhole conditions.
Implementation Method 1
The inductive coupling of drill pipe joints along the drill string enables high speed data communication between downhole tools and the surface drillers
Implementation Method 2
A helical electrical conductor, for example a copper wire, comprising a plurality of vertical loops may be disposed within the ferrite channel or trough
Data Source
AI summary
A downhole data transmission system comprising a composite polymeric annular block including a ferrite channel molded therein. The block being suitable for being housed within an annular groove or trough in the shoulder of a drill pipe. The annular block comprising a volume of sub-micron and micron elements of Fe and Mn. The ferrite channel defining an annular core region and an insulated helical coil laying within the core region. One end of the insulated helical coil passing through the ferrite channel and the annular block. A gasket molded into the block and extending from the block provides a sealed pathway for the end of the coil to exit the groove and connect to a cable; the other end of the coil being connected to ground. The annular block further includes a bumper protruding from its peripheral wall and a void opening within the annular block proximate the bumper.