Drill String Vibration Management via Normalized Status Variables
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Severe oscillations in drill strings during borehole drilling can damage components, and existing methods lack effective solutions to mitigate these vibrations.
Innovation Solution
The method involves identifying critical modes of oscillation in the drill string using sensor measurements and finite element modeling, allowing for the adjustment of drilling parameters such as rotational speed and torque to minimize vibrations at sensitive components, thereby preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If drilling parameters are adjusted to reduce oscillations, then drill string vibration is reduced, but drilling productivity decreases
Solution Approach 1:
The system dynamically adjusts drilling parameters in real-time based on measured oscillation characteristics. The controller continuously monitors drill string oscillations and modifies drilling parameters adaptively to minimize vibrations while maintaining optimal drilling performance, rather than using static parameter settings
Solution Approach 2:
The system changes physical parameters of the drilling operation (rotational speed, weight on bit, feed rate) based on measured oscillation data. By analyzing the frequency and amplitude of drill string oscillations, the controller adjusts these parameters to move away from resonant conditions that cause severe vibrations
2Reliability
If drilling parameters are adjusted to minimize vibrations, then component damage risk is reduced, but drilling efficiency decreases
Solution Approach 1:
The system implements a closed-loop feedback mechanism where drill string oscillations are continuously measured by sensors, analyzed by a controller, and used to adjust drilling parameters in real-time. This feedback loop enables the system to maintain reliable operation by preventing vibrations from reaching damage-threshold levels while optimizing drilling efficiency
3Object-affected harmful factors
If trial and error methods are used to adjust drilling parameters, then vibration reduction may be achieved, but time is lost and productivity decreases
Solution Approach 1:
The system performs preliminary analysis of drill string oscillation characteristics using measured data and predictive models. By anticipating vibration problems before they lead to damage and pre-calculating optimal parameter adjustments, the system eliminates the need for time-consuming trial-and-error adjustments during drilling operations
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A method for adjusting a drilling parameter of a drill string includes: determining one or more modes of the drill string; sensing a first oscillation amplitude at a first position in the drill string and/or an oscillation parameter of the drill string at the first position or a second position to provide measured first oscillation amplitude data and/or measured oscillation parameter data; identifying a mode of the drill string using one or more determined modes and a stability criterion and at least one of the measured first oscillation amplitude data and the measured oscillation parameter data; calculating an oscillation amplitude at a position of interest in the drill string using the identified mode and at least one of the measured first oscillation amplitude data, the measured oscillation parameter data and the stability criterion; and adjusting the drilling parameter in response to the calculated oscillation amplitude at the position of interest.