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July 30, 2026Scientific ReportsOpen Access

Numerical investigation and optimization of structural and operating parameters for cuttings transport in a bidirectional eccentric micro-underreamer

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Authors

XZXu ZhangCMCao MLLLi Liu

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Overview

Numerical investigation optimizes cuttings transport in underreaming, enhancing safety and efficiency.

Key Points

  • This study aims to investigate and optimize the parameters affecting cuttings transport in a bidirectional eccentric micro-underreamer.
  • Developed a three-dimensional solid–liquid two-phase flow model for the underreamer.
  • Utilized an Eulerian–Lagrangian approach for the coupling between drilling fluid and cuttings particles.
  • Examined effects of drill string rotational speed, weight on bit, drilling fluid density, and viscosity on cuttings transport.
  • Cuttings discharge efficiency peaked at a rotational speed of 50 r/min and weight on bit of 100 kN.
  • Increasing drilling fluid density decreased transport performance, while higher viscosity improved drag and suspension.
  • Optimal parameters for cuttings-carrying performance were found at a density of 1.6 g/cm³ and viscosity of 50 mPa·s.

Cite This Study

Zhang et al. (2026) studied this question.

synapsesocial.com/papers/6a6af4ad60e2b924d3ea044bhttps://doi.org/10.1038/s41598-026-64085-8
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