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Modeling of Drillstrings

[+] Author Affiliations
M. A. Elsayed, Chin Chin Phung

University of Louisiana at Lafayette, Lafayette, LA

Paper No. OMAE2005-67008, pp. 15-24; 10 pages
doi:10.1115/OMAE2005-67008
From:
  • ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
  • 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 1, Parts A and B
  • Halkidiki, Greece, June 12–17, 2005
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4195-2 | eISBN: 0-7918-3759-9
  • Copyright © 2005 by ASME

abstract

In this paper we show how a drillstring can be modeled in terms of limited numbers of masses and springs for the purpose of building a test rig. The model should represent the drillstring dynamics to a reasonable degree of accuracy. We will use the real component of the Frequency Response Function and the stability diagram as measures of dynamic similarity between the model and drillstring. We will also show how the chosen modes can be decoupled and used in obtaining the bit displacement. The decoupled modes will be used in a proposed test rig configuration that would increase flexibility in adding or removing modes from the system. Obtaining a representative model of the test rig is critical to our ability to extrapolate laboratory data into field applications.

Copyright © 2005 by ASME

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