Downhole Communication via Passive Electromagnetic Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional downhole communication systems, particularly in oil and gas wells, face challenges in accurately controlling and confirming the actuation of downhole tools due to the harsh environment and limitations of existing RFID technologies, which are prone to failure at high temperatures and lack reliable confirmation of tool actuation and degree of actuation.
Innovation Solution
A system utilizing a primary and secondary element for electromagnetic coupling, where the secondary element is electronically passive and capable of withstanding high temperatures, allowing for reliable detection of the proximity and state of downhole tools without active electronics, enabling accurate measurement of coupling and actuation confirmation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID tags with active electronics are used for downhole communication, then information can be stored and communicated, but the system fails at high temperatures
Solution Approach 1:
The patent extracts the active electronics from the system by using a passive secondary element that relies on electromagnetic coupling with a primary element for all operational functions. This eliminates temperature-sensitive components while maintaining communication capability through purely passive electromagnetic interaction between elements
Solution Approach 2:
The patent replaces active electronic systems with passive electromagnetic coupling mechanisms. The secondary element uses electromagnetic field coupling rather than active electronics to achieve communication and actuation confirmation, thereby eliminating the temperature limitation inherent in electronic components
2Ease of operation
If conventional shifting tools are used to actuate downhole tools, then mechanical actuation can be achieved, but accurate control and confirmation of actuation is difficult
Solution Approach 1:
The patent implements feedback by using the secondary element to detect and confirm the actuated state of downhole tools. The electromagnetic coupling provides real-time feedback to the surface system, allowing accurate determination of whether actuation has occurred and the degree of actuation, thereby resolving the measurement precision problem
Solution Approach 2:
The patent introduces an intermediary electromagnetic coupling system between the shifting tool and the downhole tool. The primary and secondary elements act as intermediaries that transmit actuation status information without requiring direct mechanical feedback, enabling precise confirmation of actuation while maintaining ease of operation
3Productivity
If work-string is used to mechanically actuate downhole tools, then downhole tools can be operated, but the work-string may catch or cause damage
Solution Approach 1:
The patent replaces the mechanical work-string actuation system with an electromagnetic coupling system. The primary element on the shifting tool and secondary element on the downhole tool enable actuation and status detection through electromagnetic fields rather than mechanical contact, eliminating the risk of the work-string catching or causing damage while maintaining productivity
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 and accurate detection of downhole tool states and actuations, even at high temperatures, enhancing the reliability and efficiency of downhole operations by eliminating the need for active electronics and improving the durability of communication systems.
Implementation Method 1
a primary element and a secondary element, wherein one of the primary and secondary elements is provided on the downhole arrangement and the other of the primary and secondary elements is provided in the throughbore, and the primary and secondary elements are configurable for coupling of an electromagnetic field therebetween
Data Source
AI summary
A system or apparatus for use in downhole communication or detection comprises a downhole arrangement defining a throughbore and primary and secondary elements. One of the primary and secondary elements is provided on the downhole arrangement and the other of the primary and secondary elements is provided in the throughbore. The primary and secondary elements are configurable for coupling of an electromagnetic field therebetween. The primary or secondary element which is provided in the throughbore may be provided on a tool such as a shifting tool which is deployable through the throughbore. The secondary element may be configured to provide the electromagnetic field coupled between the first and second elements with one or more characteristic features. The system may be configured for use, in particular though not exclusively, for communicating information to and/or from a downhole tool in an oil or gas well.