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A new drilling method—Earthworm-like vibration drilling

Author

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  • Peng Wang
  • Hongjian Ni
  • Ruihe Wang

Abstract

The load transfer difficulty caused by borehole wall friction severely limits the penetration rate and extended-reach limit of complex structural wells. A new friction reduction technology termed “earthworm-like drilling” is proposed in this paper to improve the load transfer of complex structural wells. A mathematical model based on a “soft-string” model is developed and solved. The results show that earthworm-like drilling is more effective than single-point vibration drilling. The amplitude and frequency of the pulse pressure and the installation position of the shakers have a substantial impact on friction reduction and load transfer. An optimization model based on the projection gradient method is developed and used to optimize the position of three shakers in a horizontal well. The results verify the feasibility and advantages of earthworm-like drilling, and establish a solid theoretical foundation for its application in oil field drilling.

Suggested Citation

  • Peng Wang & Hongjian Ni & Ruihe Wang, 2018. "A new drilling method—Earthworm-like vibration drilling," PLOS ONE, Public Library of Science, vol. 13(4), pages 1-21, April.
    • Handle: RePEc:plo:pone00:0194582
    DOI: 10.1371/journal.pone.0194582
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