Drill String Vibration Damping via Reverse Torque
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Solution Overview
Problem
Current methods fail to effectively dampen torsional vibration in drill strings, particularly due to stick-slip, which can lead to equipment failure and reduced drilling efficiency.
Innovation Solution
A system and method that apply a reverse torque to the drill string by interacting with the borehole wall or inducing internal rotational fluid resistance, limiting the maximum angular velocity and damping torsional vibration through frictional or fluid frictional means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a reverse torque is applied to dampen torsional vibration, then the torsional vibration amplitude is reduced, but the drilling speed and efficiency are decreased
Solution Approach 1:
The damping system dynamically adjusts the reverse torque based on real-time detection of torsional vibration conditions. The system applies damping force only when vibration exceeds thresholds, and modulates the magnitude of damping based on vibration severity, allowing optimal balance between vibration control and drilling efficiency throughout the drilling process
Solution Approach 2:
The system continuously monitors drill string rotation parameters and uses this feedback to control the damping mechanism. Sensors detect torsional vibration conditions and feed this information back to the control system, which adjusts the reverse torque application accordingly, creating a closed-loop control system that adapts to changing drilling conditions
2Stability of the object's composition
If frictional resistance is increased to apply reverse torque, then torsional vibration is damped, but the energy consumption increases
Solution Approach 1:
The system extracts and applies damping force only during specific vibration events rather than continuously. By isolating the damping action to only when and where it is needed (during torsional vibration episodes), the system minimizes energy consumption while maintaining effectiveness in controlling stick-slip vibrations
Solution Approach 2:
The system changes the friction parameter dynamically based on vibration conditions. The frictional resistance is adjusted to match the severity of torsional vibration, applying just enough damping force to control the vibration while minimizing energy loss. This allows the system to operate with low energy consumption during normal drilling and increase damping only when vibration occurs
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 reduces torsional vibration amplitude, preventing equipment failure and improving drilling efficiency by quickly responding to excessive vibration with a controlled damping force.
Implementation Method 1
applying a reverse torque to the drill string by imposing frictional resistance to the rotation of the drill string
Implementation Method 2
reverse torque is applied by increasing fluid frictional resistance to the rotation of the drill string
Data Source
AI summary
An apparatus and method for damping vibration, especially torsional vibration due to stick-slip, in a drill string, Sensors measure the instantaneous angular velocity of the drill string at one or more locations along the length of the drill string. One or more vibration damping modules are also spaced along the length of the drill string. When torsional vibration above a threshold is detected, the damping module imposes a reverse torque on the drill that dampens the torsional vibration. The reverse torque can be created by imparting a frictional resistance to the rotation of the drill string. The frictional resistance can be created externally, by extending friction pads from the damping module so that they contact the bore hole wall and drag along the bore hole as the drill string rotates, or internally by anchoring a housing mounted on the drill string to the wall of the bore hole and then imposing frictional resistance on a fluid, such as a magnetorheological fluid, flowing within the drill string.