Drill String HFTO Detection Using Electrical Machine Movement
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Solution Overview
Problem
Existing drill string vibration detection systems, particularly for High Frequency Torsional Oscillations (HFTOs), are ineffective when conventional sensors are positioned at nodes, leading to undetected vibrations and potential damage due to propagated oscillations.
Innovation Solution
Employing an electrical machine with a stator and movable element in the drill string to measure vibrations via a control circuit, utilizing the electrical machine's magnetic field and relative movement to detect and control downhole operations based on vibration amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional vibration sensor is positioned at a node of the torsional vibration mode, then the sensor structure is simple and easy to install, but the sensor outputs only a small signal or no signal, leading to undetected HFTOs
Solution Approach 1:
The patent uses the electrical machine as an intermediary component to detect vibrations. Instead of placing a dedicated sensor at the node position, the electrical machine's movable element serves as a mediator that converts mechanical vibrations into measurable electrical signals through its interaction with the magnetic field, enabling detection without requiring precise positioning at antinodes
Solution Approach 2:
The patent replaces the conventional mechanical vibration sensor with an electrical machine that uses electromagnetic principles for detection. The movable element in the magnetic field substitutes for traditional mechanical sensors, utilizing electromagnetic induction to detect vibrations and convert them into electrical signals for measurement
2Reliability
If an electrical machine is used to detect vibrations, then real-time vibration detection and control capability is improved, but the device complexity increases due to additional components
Solution Approach 1:
The patent applies multi-functionality by using the electrical machine for both its primary function (driving downhole operations) and as a vibration detection device. The same electrical machine components (stator, movable element, magnetic field) serve dual purposes, eliminating the need for separate dedicated sensors and reducing overall system complexity
Solution Approach 2:
The electrical machine performs self-detection by utilizing its own components to sense vibrations. The movable element and magnetic field inherently respond to mechanical vibrations, allowing the machine to monitor its own operational environment without requiring external sensing systems
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
Effectively detects and identifies HFTO modes along the drill string, reducing the risk of damage by allowing for real-time control and mitigation of vibrations, enhancing drilling efficiency and component longevity.
Implementation Method 1
measuring a signal indicative of a movement of the movable element in the electrical machine due to rotation of the drill string
Data Source
AI summary
A system and method of detecting a vibration of a drill string in a borehole. The drill string is conveyed into the borehole, the drill string including an electrical machine, the electrical machine including a stator and a movable element, the movable element movable relative to the stator, the drill string is rotated in the borehole. A control circuit determines first amplitude of the vibration of the drill string by measuring a signal indicative of a movement of the movable element in the electrical machine due to rotation of the drill string and controls a downhole operation of the drill string based on the detected first amplitude of the vibration.