Coaxial Drill Pipe Electromagnetic Coupling for High-Speed Data
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Solution Overview
Problem
Current data communication systems in downhole drilling environments face challenges with slow data rates, complexity, high costs, and reliability issues due to electrical losses and angular misalignment of drill pipes, limiting bi-directional data transmission efficiency.
Innovation Solution
A coaxial transmission line structure within drill pipes using non-magnetic conductive layers and dielectric materials, with an electromagnetic coupler that allows for low-loss data transmission across pipes with varying angular orientations, eliminating the need for direct electrical connections and reducing transmission losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic coupling methods are used for data transmission between drill pipes, then data transmission can be achieved without direct electrical connections, but transmission losses are higher and data rates are limited
Solution Approach 1:
The patent replaces magnetic coupling with electromagnetic coupling, substituting a less efficient mechanism with a more advanced one. The electromagnetic coupler uses electromagnetic fields instead of magnetic fields alone, enabling higher data rates (up to 50 Mb/s) and lower transmission losses while maintaining the non-contact connection between drill pipe sections
Solution Approach 2:
The patent changes the operating parameters of the coupling system by using electromagnetic frequencies in the RF range (e.g., 900 MHz, 2.4 GHz) instead of lower frequency magnetic coupling. This parameter change enables higher bandwidth and data rates while reducing the relative impact of transmission losses over the coupling distance
2Loss of energy
If direct electrical connections are used between drill pipe sections, then electrical losses are minimized, but the system becomes sensitive to angular misalignment and wear and tear
Solution Approach 1:
The patent introduces an electromagnetic coupler as an intermediary device between drill pipe sections. This coupler acts as a mediator that transfers electromagnetic signals without requiring direct electrical contact, thereby eliminating sensitivity to angular misalignment and mechanical wear while maintaining efficient signal transmission
Solution Approach 2:
The patent replaces the mechanical direct electrical connection system with an electromagnetic field-based coupling system. This substitution eliminates the mechanical contact interface that is susceptible to angular variations and wear, while achieving comparable or better electrical performance through electromagnetic induction
3Device complexity
If mud pulse technique is used for data communication, then no additional transmission infrastructure is needed, but data rates are slow and system complexity increases
Solution Approach 1:
The patent divides the drill string into sections with integrated coaxial transmission lines and electromagnetic couplers at the joints. This segmentation allows each section to function as an independent transmission segment, enabling high-speed data communication while keeping the overall system modular and manageable
Solution Approach 2:
The patent integrates multiple functions into the drill pipe structure: the coaxial transmission line serves both as a mechanical conduit for drilling fluid and as an electromagnetic transmission medium for data communication. The electromagnetic coupler simultaneously provides electrical isolation and magnetic shielding while enabling signal transmission, reducing overall system 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
Enables high-frequency data transmission at rates greater than 150 kb/s, up to 50 Mb/s, with reduced maintenance costs and improved reliability, insensitive to angular variations due to wear and tear, and lower energy losses compared to magnetic coupling methods.
Implementation Method 1
an electromagnetic coupler to couple the coaxial transmission line with a complementary coaxial transmission line carried by a pipe complementary to the pipe
Implementation Method 2
at least one first layer of dielectric material mounted in-between the first and the second layers of electrically conductive material
Data Source
Figure 1
Figure 2~5
Figure 3
AI summary
Ensemble comprising a pipe (2, 3) for transporting substances which can flow, the pipe having a structure forming a coaxial transmission line comprising: - a first tubular layer of electrically conductive material (41, 44); - a second tubular layer of electrically conductive material (43, 46); and - at least one first layer of dielectric material (42, 45) mounted in-between the first and the second layers of electrically conductive material, such that : o the first layer of electrically conductive material forms an outer conductor of a section of the said coaxial transmission line; o the second layer of electrically conductive material forms an inner conductor of the section of the said coaxial transmission line, characterized in that it comprises an electromagnetic coupler (60) for coupling the said coaxial transmission line with a complementary coaxial transmission line carried by a pipe complementary to the said pipe.