Bit Support Assembly Friction Damping for HFTO Reduction
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Solution Overview
Problem
Severe vibrations in drill strings and bottomhole assemblies during drilling operations, caused by cutting forces and mass imbalances, lead to reduced rate of penetration, measurement quality, and component wear, particularly high-frequency torsional oscillations (HFTO) which pose challenges for operational efficiency and reliability.
Innovation Solution
The implementation of a damping system with friction dampers installed on the bit support assembly, utilizing friction between interacting bodies to dissipate energy and mitigate torsional oscillations, with the damping system comprising elements that move relative to the bit support assembly, ensuring energy dissipation and reducing vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damping system with friction dampers is installed on the bit support assembly, then high-frequency torsional oscillations are reduced by dissipating energy, but device complexity increases
Solution Approach 1:
The patent converts the harmful high-frequency torsional oscillations into beneficial thermal energy through friction dampers. The dampers are specifically designed to dissipate HFTO energy through controlled friction between contact surfaces, transforming the harmful vibrational energy into heat that is dissipated to the surrounding environment, thereby reducing oscillations while managing the added complexity through purposeful energy conversion
Solution Approach 2:
The patent changes the physical state and parameters of the bit support assembly by introducing friction-based energy dissipation mechanisms. The dampers modify the torsional stiffness and damping characteristics of the assembly, altering the system's dynamic response to HFTO. This involves changing material properties, contact surface characteristics, and friction coefficients to optimize energy dissipation while managing system complexity
2Duration of action of stationary object
If dampers are installed to reduce vibrations, then component wear is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The damping system is segmented into modular friction damper units that can be independently manufactured and assembled on the bit support assembly. Each damper consists of discrete components with friction surfaces that can be produced using standard manufacturing processes, allowing for easier fabrication and assembly while providing extended component life through vibration reduction
Solution Approach 2:
The friction dampers are designed as self-regulating devices that automatically adjust their energy dissipation characteristics based on the HFTO conditions. The friction surfaces self-adjust through wear and temperature changes, providing adaptive damping without requiring external control systems or complex adjustment mechanisms, thereby extending component life while maintaining manufacturing simplicity
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 damping system effectively reduces HFTO by dissipating energy, thereby improving operational efficiency, extending component lifespan, and maintaining measurement quality by minimizing the negative impacts of vibrations on downhole systems.
Implementation Method 1
utilizing friction between interacting bodies to dissipate energy and mitigate torsional oscillations
Data Source
AI summary
Methods and systems for damping torsional oscillations of downhole systems are described. The systems include a downhole string, a bit support assembly configured to support and receive a disintegration device, wherein the disintegration device is disposed on an end of the downhole string and mounted to the bit support assembly, and a damping system configured at least one of on and in the bit support assembly, the damping system comprising at least one damper element arranged in contact with a portion of the bit support assembly.