Volume 36 Issue 2
Apr.  2019
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2019  >  36(2): 229-233
CHENG Yongqin, LI Qian, YIN Hu, SHI Jiangang, SONG Lin, XIONG Chao, LI Shiping. Calculation of Displacement Efficiency When Casing String is Rotating Based on Herschel-Bulkley Model[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(2): 229-233. doi: 10.3969/j.issn.1001-5620.2019.02.017
Citation: CHENG Yongqin, LI Qian, YIN Hu, SHI Jiangang, SONG Lin, XIONG Chao, LI Shiping. Calculation of Displacement Efficiency When Casing String is Rotating Based on Herschel-Bulkley Model[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(2): 229-233. doi: 10.3969/j.issn.1001-5620.2019.02.017
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Calculation of Displacement Efficiency When Casing String is Rotating Based on Herschel-Bulkley Model

doi: 10.3969/j.issn.1001-5620.2019.02.017

  • 1. Southwest Petroleum University, School of Petroleum Engineering, Chengdu 610500;

  • 2. Engineering Technology Research Institute of PetroChina Xinjiang Oilfield Branch, Karamay 834000

  • Received Date: 2018-12-27
  • Publish Date: 2019-04-30
    Abstract
  • Rotating casing string during well cementing is an important measure of increasing displacement efficiency. To quantitatively calculate the displacement efficiency when casing string is being rotated during pumping of cement slurry, infinitesimal method is used to analyze the stresses exerted on the cement slurry which is displacing drilling fluid while the casing string is being rotated, and a model was established for calculating the displacement efficiency of cement slurry when the displacement interface reaches an equilibrium. Using this model, different circumferential displacement efficiencies at different casing string rotational speeds can be worked out. Calculation using the model showed that when the rotational speed was greater than 10, the thickness of the stagnant retention layer of drilling fluid on the surface of the borehole wall can reduced. When the consistency coefficient of the cement slurry was increased, and the flow index was between 0.4 and 0.7, rotating casing string can remarkably increase displacement efficiency.

     

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