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Dynamic Analysis of Bottom Hole Assembly With External Vibrating Force Excitation

[+] Author Affiliations
Lei Wang, Stephen Butt, Jianming Yang

Memorial University of Newfoundland, St. John’s, NL, Canada

Paper No. IMECE2013-62572, pp. V04BT04A069; 11 pages
doi:10.1115/IMECE2013-62572
From:
  • ASME 2013 International Mechanical Engineering Congress and Exposition
  • Volume 4B: Dynamics, Vibration and Control
  • San Diego, California, USA, November 15–21, 2013
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5625-3
  • Copyright © 2013 by ASME

abstract

Based on the Downhole Oscillating Device (DOD) newly developed for purpose of improving drilling efficiency, Computational Fluid Dynamics (CFD) simulation is conducted. The axial vibration force created by the DOD is thoroughly investigated. The simulation is focused on the valve part which generates the fluid pressure pulsations. Fluid flow rate and/or back pressure is applied to the model as boundary conditions. The DOD’s application will also induce the inertia phenomenon of the fluid column above the tool. This phenomenon is also studied based on parametric analysis. Within the simulation results, a dynamic model is developed to further investigate the effect of the oscillating force generated by the DOD on drilling efficiency. Nonlinearities in the bit-rock interaction are taken into account in the model. Simulation results show that application of the DOD in drilling may improve the ROP at least by 5%.

Copyright © 2013 by ASME

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