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TECHNICAL PAPERS

Field Verification of Model-Derived Natural Frequencies of a Drill String

[+] Author and Article Information
Pushkar N. Jogi, John D. Macpherson

Baker Hughes INTEQ, Houston, TX 77267

Michael Neubert

Baker Hughes INTEQ GmbH, Celle, Germany

J. Energy Resour. Technol 124(3), 154-162 (Aug 06, 2002) (9 pages) doi:10.1115/1.1486018 History: Received March 28, 2001; Revised March 01, 2002; Online August 06, 2002
Copyright © 2002 by ASME
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References

Figures

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Autospectra of axial acceleration showing the resonant axial frequencies and their envelope
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Autospectra of X-bending moment showing rpm (N) and bending (L) frequency peaks and the resonance envelope
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Autospectra of axial acceleration showing rpm (N) and bending (L) frequency peaks and the resonance envelope
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Autospectra of X-bending moment showing rpm (N) and bending (L) frequency peaks and the resonance envelope
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Autospectra of axial acceleration showing rpm (N) and bending (L) frequency peaks and the resonance envelope
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Spectrogram of coherent output power for axial and bending data showing lateral frequencies
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Lateral natural frequencies at 1.632 s (from spectrogram in Fig. 6)
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BHASYS-derived lateral mode shapes corresponding to the first four measured critical speeds in Table 5
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Autospectra of downhole torque showing wider band-width torsional resonances and narrower rotational frequency (N) peaks
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Autospectra of downhole torque showing wider band-width torsional resonances and narrower rotational frequency (N) peaks
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Comparison of measured and model-derived axial frequencies
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Comparison of measured and model-derived lateral frequencies
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Comparison of measured and model-derived torsional frequencies

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