Drill String Vibration Damping With Speed-Responsive Magnetic Braking
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Solution Overview
Problem
Current drill string vibration damping solutions primarily focus on bit-rock interaction, failing to address the diverse sources of vibrations along the drill string, such as mechanical friction, hydraulic forces, and centrifugal accelerations, which can destabilize the wellbore and reduce drilling efficiency.
Innovation Solution
A device comprising brake means with brake parts and an inner, tubular body connected to the drill string, supported by an outer sleeve with roller wheels, uses eddy currents or magnetic braking to resist rotational and longitudinal vibrations based on the speed of motion, allowing the device to move along the wellbore wall and separate axial and rotational friction components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-location vibration damping solution is used, then the device structure is simple, but it only deals with certain vibration scenarios and cannot address diverse vibration sources along the drill string
Solution Approach 1:
The drill string is divided into multiple sections, each equipped with its own vibration damping device. This segmentation allows each device to independently address vibrations in its specific section, thereby covering diverse vibration sources along the entire drill string while maintaining relatively simple individual device structures.
Solution Approach 2:
The vibration damping device is designed with universal applicability to handle multiple types of vibrations (torsional, longitudinal, lateral) and can be installed at various locations along the drill string. This multi-functional design enables a single device type to address diverse vibration scenarios without requiring completely different device designs.
2Reliability
If brake parts are made movable relative to each other to produce braking force, then vibration damping effectiveness is improved, but the device complexity increases due to additional moving components
Solution Approach 1:
The brake parts are designed to automatically engage and produce braking force in response to vibrations without requiring external control systems. The relative movement between brake parts is self-regulated by the vibration conditions themselves, allowing the system to self-adjust and dampen vibrations effectively while avoiding the complexity of active control mechanisms.
Solution Approach 2:
The patent replaces complex electronically-controlled braking systems with a purely mechanical brake mechanism. The braking force is generated through direct mechanical interaction between brake parts that move relative to each other in response to vibrations, eliminating the need for sensors, actuators, and control electronics while maintaining damping effectiveness.
3Ease of operation
If the device uses eddy currents or magnetic braking to resist vibrations, then vibration damping is achieved without electrical or hydraulic activation, but the device requires specific magnetic components that may increase complexity
Solution Approach 1:
The patent replaces traditional mechanical friction-based braking with eddy current or magnetic braking mechanisms. These mechanisms use electromagnetic fields to generate braking force without physical contact, eliminating the need for electrical or hydraulic activation systems while providing smooth and effective vibration damping. The magnetic components are integrated directly into the brake structure, minimizing additional complexity.
4Stability of the object's composition
If the roller wheel is configured to prevent rotational slipping of the outer sleeve, then the device maintains positional stability, but friction between the roller wheel and wellbore wall increases
Solution Approach 1:
The roller wheel is designed with optimized contact parameters including contact area, material properties, and surface characteristics. By carefully selecting and adjusting these parameters, the device achieves sufficient friction to prevent rotational slipping and maintain positional stability, while minimizing excessive friction that would lead to energy loss and reduced drilling efficiency.
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 device effectively dampens a wide range of drill string vibrations, improving drilling performance by maintaining weight on the bit and reducing mechanical wear, without requiring electrical or hydraulic activation, suitable for high-temperature environments.
Implementation Method 1
uses eddy currents or magnetic braking to resist rotational and longitudinal vibrations based on the speed of motion
Implementation Method 2
uses eddy currents or magnetic braking to resist rotational and longitudinal vibrations based on the speed of motion
Implementation Method 3
the roller wheel being configured to facilitate longitudinal movement of the device along the wall and prevent rotational slipping of the outer sleeve relative to the wall upon rotation of the drill string
Data Source
AI summary
A device for damping vibrations of a rotary drill string in motion in a wellbore, a related method, drill string and drill string sub or section, where at least one component of motion of the drill string is communicated to the device, and brake means counter the vibrations, resisting the motion in dependence upon the speed of motion. The device may have an outer sleeve arranged on an inner, tubular body which is rotatably arranged within the outer sleeve. Roller wheels support the sleeve on the wellbore wall and facilitate longitudinal movement of the device and prevent rotational slipping of the outer sleeve relative to the wall upon rotating the tubular body and drill string. One brake part of the brake means on the outer sleeve and another on the tubular body operate to resist rotational vibration components.