A new drilling method—Earthworm-like vibration drilling

Peng Wang, Hongjian Ni and Ruihe Wang

PLOS ONE, 2018, vol. 13, issue 4, 1-21

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.

Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0194582

DOI: 10.1371/journal.pone.0194582

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