Downhole Surface Wave Transceivers for Wireless Data Transmission
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Solution Overview
Problem
Downhole wireless communication in well systems faces challenges due to harsh environments and attenuation of wireless transmissions, particularly when sensors are positioned far from the well surface, leading to inefficient data transfer.
Innovation Solution
The use of surface waves for wireless communication between transceivers positioned externally to the casing string, where surface waves propagate along the interface between the casing string and a cement sheath, offering improved power transmission efficiency over larger distances with reduced attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors transmit data wirelessly from far away from the well surface, then cable wear and failure are eliminated, but attenuation and distortion of wireless transmissions increase
Solution Approach 1:
The patent introduces an intermediary transmission medium (formation waves propagating through the subterranean formation) to carry data from downhole sensors to the surface. This wave-based intermediary allows data transmission without physical cables while utilizing the formation itself as the transmission path, thereby eliminating cable wear issues while maintaining transmission efficiency.
Solution Approach 2:
The patent replaces the mechanical cable-based transmission system with a wave-based transmission system. Instead of using physical cables that are subject to wear and failure in harsh downhole environments, the system uses formation waves (acoustic, electromagnetic, or other wave types) to transmit data wirelessly through the subterranean formation, eliminating mechanical contact and associated reliability issues.
2Adaptability or versatility
If sensors are positioned far from the well surface, then more downhole parameters can be measured, but wireless transmission efficiency decreases
Solution Approach 1:
The subterranean formation serves as an intermediary transmission medium that enables efficient data transmission over long distances. By utilizing formation waves that propagate through the formation itself, the system maintains high data transfer efficiency even when sensors are positioned far from the well surface, thus supporting versatile sensor deployment while preserving productivity.
3Ease of operation
If traditional wireless transmission is used in harsh downhole environments, then data can be transmitted, but transmission reliability decreases due to environmental factors
Solution Approach 1:
The patent replaces traditional electromagnetic wireless transmission (which is susceptible to interference from harsh downhole conditions) with formation wave transmission. These waves propagate through the subterranean formation itself, which provides a stable and controlled transmission path that is less affected by external environmental factors such as temperature variations, pressure changes, and electromagnetic interference, thereby improving transmission reliability.
Solution Approach 2:
The patent converts the harsh downhole environment from a harmful factor into a beneficial transmission medium. The subterranean formation, which presents challenges for traditional wireless transmission, becomes the ideal propagation path for formation waves. The formation's physical structure provides natural guidance and protection for the waves, turning environmental challenges into advantages for reliable data transmission.
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
This method enables reliable and efficient wireless communication of data from downhole sensors to the surface by leveraging surface waves, which are less affected by the subterranean formation's conductivity, allowing for improved data transfer rates and reduced distortion.
Implementation Method 1
A transceiver can generate surface waves by transmitting power to an antenna at a frequency within a specific frequency range
Implementation Method 2
The surface wave can include an electromagnetic wave that propagates along an interface surface between two different media (e.g., two different solids or fluids) and does not produce electromagnetic radiation
Data Source
AI summary
A communication system that is positionable in a wellbore can include a first transceiver for coupling externally to a casing string. The first transceiver can be for wirelessly transmitting data by generating and modulating a surface wave that propagates along an interface surface. The surface wave can include an electromagnetic wave that has a magnetic field or an electric field that is at an acute angle to a direction of propagation of the surface wave. The communication system can also include a second transceiver for coupling to the casing string and for wirelessly receiving the surface wave and detecting the data.