Volume 42 Issue 4
Jul.  2025
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SUN Jialin, ZHANG Jianwei, FAN Sen, et al.Comparison of cuttings concentration in annular spaces of horizontal wells between water- and oil-based drilling fluids[J]. Drilling Fluid & Completion Fluid，2025, 42（4）：516-522 doi: 10.12358/j.issn.1001-5620.2025.04.011
Citation: SUN Jialin, ZHANG Jianwei, FAN Sen, et al.Comparison of cuttings concentration in annular spaces of horizontal wells between water- and oil-based drilling fluids[J]. Drilling Fluid & Completion Fluid，2025, 42（4）：516-522 doi: 10.12358/j.issn.1001-5620.2025.04.011
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Comparison of Cuttings Concentration in Annular Spaces of Horizontal Wells Between Water- and Oil-Based Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2025.04.011

  • College of Petroleum Engineering, Northeast Petroleum University, Daqing, Hei Longjiang 163318

  • Received Date: 2025-01-12
  • Rev Recd Date: 2025-02-23
  • Publish Date: 2025-07-31
    Abstract
  • Most researchers are presently conducting researches on cuttings transport in water-based drilling fluid. However, with the increasing application of oil-based drilling fluids, it is necessary to explore the differences in cuttings transport between water- and oil-based drilling fluids. A three-dimensional wellbore model was established through CFD (Computational Fluid Dynamics) to investigate the differences in cuttings transport between water- and oil-based drilling fluids, and by comparing with the results of laboratory experiments, the reliability of the established CFD model was verified. Through CFD numerical simulation, it was concluded that under the same drill string eccentricity or drilling fluid inlet velocity, the height of the cuttings bed of the oil-based drilling fluid is lower than that of the water-based drilling fluid; and when the particle sizes of the cuttings are 2-4 mm and the drill pipe rotation speed is less than 80 r/min, the cuttings concentration in the oil-based drilling fluid in the annulus is significantly lower than that of the water-based drilling fluid. Previous studies have shown that the larger the cuttings particles, the more difficult it is to transport them out of the wellbore. However, this study found that the cuttings particles with a size of 2-3 mm are more difficult to transport out of the wellbore than those with a size of 3-4 mm, and it is not that the larger the particle size of the cuttings, the more difficult it is to transport them out of the wellbore. Although previous studies have shown that the greater the eccentricity, the higher the cuttings concentration, this study found that when the eccentricity is lower than 0.3, the cuttings concentration in the annulus of the horizontal well does not change much, but when the eccentricity exceeds 0.3, the cuttings concentration gradually increases. Based on the above research, these results provide a better understanding and guidance for the optimization of drilling parameters of horizontal wells.

     

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