Volume 39 Issue 6
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WANG Gui, TAN Kai, CAO Cheng.Settling behavior and drag coefficient model of rock cuttings of varied shapes[J]. Drilling Fluid & Completion Fluid，2022, 39（6）：707-713 doi: 10.12358/j.issn.1001-5620.2022.06.007
Citation: WANG Gui, TAN Kai, CAO Cheng.Settling behavior and drag coefficient model of rock cuttings of varied shapes[J]. Drilling Fluid & Completion Fluid，2022, 39（6）：707-713 doi: 10.12358/j.issn.1001-5620.2022.06.007
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Settling Behavior and Drag Coefficient Model of Rock Cuttings of Varied Shapes

doi: 10.12358/j.issn.1001-5620.2022.06.007

  • Petroleum Engineering School, Southwest Petroleum University, Chengdu，Sichuan 610500

  • Received Date: 2022-06-08
  • Rev Recd Date: 2022-07-19
  • Publish Date: 2022-11-30
    Abstract
  • In oil and gas drilling, free settling of drilled cuttings along the wellbore may cause pipe sticking. To investigate the settling behavior of the cuttings particles, laboratory experiment was performed to simulate the free settling of drilled cuttings. Using the data collected in the experiment and image processing technology, the final settling velocities and drag coefficients of 10 kinds of particles of varied shapes in 9 non-Newtonian fluids were calculated and the effects of the particle shape and rheology of the fluids on the settling behavior of the particles were investigated. The adaptability of the existing drag coefficient models to the settling of non-spherical particles in non-Newtonian fluids was also studied. The results of the studies show that the higher the non-sphericity of the particles, the more difficult for them to settle in the fluids. Increase in the viscosity of the fluid can effectively hinder the settling of the particles, and the stronger the non-Newtonian property of the fluids, the stronger the hindrance of the fluids on the settling of the particles. The existing drag coefficient models are not suitable for describing the settling behavior of non-spherical particles in non-Newtonian fluids. To solve this problem, a new shape factor is presented to build a new drag coefficient model. Results of the error analyses of the model show that the new model has excellent fit to the data measured in settling experiment; the coefficient of determination R2 is greater than 0.99. Compared with the existing model the prediction accuracy of the new model is increased by 50.5%, and errors in predicting the drag coefficient of real rock particles are less than 15%. This new model can be used to better describe the settling drag coefficient of rock particles of varied shapes, and has both theoretical and practical significance to improving the stability of rock particles in drilling fluid during drilling operation.

     

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