Toroidal Antenna Assembly for Drill String Data Transmission
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Solution Overview
Problem
Conventional electromagnetic (EM) data transmission systems for drilling operations mechanically weaken the drill string and have temperature limitations, and alternative methods often face power and frequency constraints, leading to inadequate data transmission to the surface.
Innovation Solution
A toroidal antenna assembly is disposed around the drill string to transmit sensor data using multiple toroidal antennas operating at the same frequency and phase, enhancing mechanical robustness and signal strength without the need for an electrical gap, allowing reliable and efficient data transmission to the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrical gap is introduced into the drill string for EM data transmission, then data transmission capability is improved, but mechanical strength of the drill string deteriorates
Solution Approach 1:
The patent removes the electrical gap component from the drill string structure entirely. Instead of inserting insulating materials that create mechanical weak points, the system uses EM coupling between adjacent metallic sections of the drill string, eliminating the need for physical gaps while maintaining data transmission capability.
Solution Approach 2:
The patent replaces the mechanical electrical gap system with an electromagnetic coupling system. Data transmission is achieved through EM fields coupling between adjacent metallic sections rather than through physical insulating barriers, substituting a mechanical structure with an electromagnetic field-based solution.
2Reliability
If insulating materials are used to create an electrical gap, then data transmission is enabled, but temperature range limitations are imposed
Solution Approach 1:
The patent removes insulating materials from the system entirely. By using direct EM coupling between metallic drill string sections, the system eliminates temperature-sensitive insulating components and their associated temperature range limitations.
Solution Approach 2:
The patent changes the fundamental parameter of how electrical isolation is achieved - moving from material-based insulation with temperature constraints to field-based EM coupling that operates across broader temperature ranges suitable for deep well drilling.
3Strength
If alternative EM transmission methods are used without an electrical gap, then mechanical strength is maintained, but data transmission capability becomes insufficient due to power and frequency constraints
Solution Approach 1:
The patent merges multiple EM signals from adjacent drill string sections into a unified transmission system. By utilizing the coupled EM fields between multiple metallic sections, the system achieves sufficient signal strength and data transmission capability without compromising mechanical integrity.
Solution Approach 2:
The patent makes the drill string itself serve dual functions: maintaining mechanical strength while simultaneously enabling EM data transmission. The metallic sections perform both structural support and EM coupling roles, eliminating the need for separate insulating 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 toroidal antenna assembly provides robust and efficient data transmission, overcoming mechanical weaknesses and power constraints of conventional systems, enabling reliable and fast data transfer from downhole sensors to the surface with improved signal amplitude and reduced power requirements.
Implementation Method 1
The toroidal antenna assembly is disposed around the drill string at a primary downhole location within the primary wellbore and configured to transmit a signal from a transmitter
Data Source
AI summary
A data transmission system for use with a drill string in a primary wellbore is disclosed. The data transmission system includes a toroidal antenna assembly. The toroidal antenna assembly is disposed around the drill string at a primary downhole location within the primary wellbore and configured to transmit a signal from a transmitter. The signal corresponds to sensor data. The toroidal antenna assembly includes a plurality of toroidal antennas, wherein each toroidal antenna is configured to transmit the same signal from the transmitter. Because a plurality of toroidal antennas are utilized to transmit the same signal, construction of the drill string can be more mechanically robust than a conventional insulated gap collar while permitting reliable and fast transmission of sensor data to the surface.