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ORIGINAL RESEARCH article

Front. Earth Sci.
Sec. Economic Geology
Volume 12 - 2024 | doi: 10.3389/feart.2024.1396784
This article is part of the Research Topic Exploration, Development, and Protection of Earth’s Resources and Environment: Methods, Techniques, Applications, Prospects, Insights, and Problems View all 13 articles

Analysis on the dynamics of flexible drillstring under different drilling parameters

Provisionally accepted
Cao Ji Cao Ji 1Qilong Xue Qilong Xue 2*Jin Wang Jin Wang 2Leilei Huang Leilei Huang 2Feng Guo Feng Guo 2Chong Wang Chong Wang 2Jun Qu Jun Qu 2
  • 1 Sinopec Research Institute of Petroleum Engineering (SRIPE), Beijing, China
  • 2 School of Engineering and Technology, China University of Geosciences, Beijing, Beijing Municipality, China

The final, formatted version of the article will be published soon.

    During the operation of the drill string, it displays a degree of flexibility. Simultaneously, its dynamic properties, influenced by complex stress conditions, manifest nonlinearity and uncertainty. A comprehensive investigation into the dynamics of flexible drill strings is imperative for deep well drilling. This paper presents a model that simulates random interactions between a flexible drill string and the borehole wall, simplifying the actual drill string model using analogous principles. Dynamic simulation software is utilized for analysis, and an indoor experimental setup has been established. The results reveal that with a constant weight on bit (WOB), higher drill string rotational speeds correlate with increased susceptibility to buckling deformation. Additionally, the critical time for deformation onset exhibits a nearly linear relationship with rotational speed. Maintaining a constant rotational speed, an increase in WOB enhances the likelihood of buckling deformation. The experimental findings suggest a correlation between the drill string's rotation frequency and the WOB.

    Keywords: Drillstring, Flexible multibody dynamics, collision, nonlinear, simulation, experimental

    Received: 06 Mar 2024; Accepted: 23 Jul 2024.

    Copyright: © 2024 Ji, Xue, Wang, Huang, Guo, Wang and Qu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Qilong Xue, School of Engineering and Technology, China University of Geosciences, Beijing, 100083, Beijing Municipality, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.