Drill strings are used in oil and gas production as well as geothermal wells. They experience destructive vibrations, many of which are highly dependent on drill string modes. In this paper, we show that the lowest frequency modes are not necessarily the most critical and we delineate a methodology for reducing the number of modes representing the drill string. The frequency response function and stability diagram are used as measures of dynamic similarity between the proposed model and the drill string. We also introduce a novel approach to represent a drill string in laboratory test rigs. This approach not only represents the drill string dynamics but also offers flexibility to modify, remove, or augment the modes representing the system. The underlying principle is that in a multi-degree-of-freedom in-series spring-mass system with Rayleigh damping, dynamic modes can be decoupled. Applying the force to the end node (bit), the modes can then be configured separately in a parallel arrangement where their contributions to bit displacement are added algebraically. A practical arrangement for this purpose is proposed in this paper. Construction of a test rig that accurately represents the drill string dynamics is critical to validation of any test data on bits, bottom hole assemblies, instrument subs, and so on.
Skip Nav Destination
Article navigation
December 2007
Research Papers
A Novel Approach to Dynamic Representation of Drill Strings in Test Rigs
M. A. Elsayed
M. A. Elsayed
Mechanical Engineering Department,
University of Louisiana at Lafayette
, Lafayette, LA 70504
Dr. M. Elsayed is a Professor of Mechanical Engineering at the University of Louisiana at Lafayette. His areas of interest are vibrations, controls and computer-aided design, and manufacturing. Prior to coming to Academia, Dr. Elsayed held several positions in industry, the last of which was Chief Engineer at Page Engineering Co. in Chicago, IL.
Search for other works by this author on:
M. A. Elsayed
Dr. M. Elsayed is a Professor of Mechanical Engineering at the University of Louisiana at Lafayette. His areas of interest are vibrations, controls and computer-aided design, and manufacturing. Prior to coming to Academia, Dr. Elsayed held several positions in industry, the last of which was Chief Engineer at Page Engineering Co. in Chicago, IL.
Mechanical Engineering Department,
University of Louisiana at Lafayette
, Lafayette, LA 70504J. Energy Resour. Technol. Dec 2007, 129(4): 281-288 (8 pages)
Published Online: May 7, 2007
Article history
Received:
November 5, 2004
Revised:
May 7, 2007
Citation
Elsayed, M. A. (May 7, 2007). "A Novel Approach to Dynamic Representation of Drill Strings in Test Rigs." ASME. J. Energy Resour. Technol. December 2007; 129(4): 281–288. https://doi.org/10.1115/1.2790979
Download citation file:
Get Email Alerts
Cited By
Related Articles
The Effect of Dynamical Parameters on Precession in Rotary Drilling
J. Energy Resour. Technol (September,2001)
Vibration Suppression of a Four-Degrees-of-Freedom Nonlinear Spring Pendulum via Longitudinal and Transverse Absorbers
J. Appl. Mech (January,2012)
Suppression of Lateral and Torsional Stick–Slip Vibrations of Drillstrings With Impact and Torsional Dampers
J. Vib. Acoust (October,2016)
Related Proceedings Papers
Related Chapters
Fundamentals of Structural Dynamics
Flow Induced Vibration of Power and Process Plant Components: A Practical Workbook
Engineering Design about Electro-Hydraulic Intelligent Control System of Multi Axle Vehicle Suspension
International Conference on Instrumentation, Measurement, Circuits and Systems (ICIMCS 2011)
Stability and Range
Design and Analysis of Centrifugal Compressors