Volume 40 Issue 4
Jul.  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(4): 502-510
TU Qiang, WANG Haiping, FU Jianglong, et al.Study on flushing efficiency of drilling fluid filter cake in oval wellbore[J]. Drilling Fluid & Completion Fluid，2023, 40（4）：502-510 doi: 10.12358/j.issn.1001-5620.2023.04.013
Citation: TU Qiang, WANG Haiping, FU Jianglong, et al.Study on flushing efficiency of drilling fluid filter cake in oval wellbore[J]. Drilling Fluid & Completion Fluid，2023, 40（4）：502-510 doi: 10.12358/j.issn.1001-5620.2023.04.013
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Study on Flushing Efficiency of Drilling Fluid Filter Cake in Oval Wellbore

doi: 10.12358/j.issn.1001-5620.2023.04.013
  • 1.

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

  • 2.

    Changqing Cementing Company Of Chuanqing Drilling Engineering Corporation, Xi’an, Shaanxi 710018

  • 3.

    The Second Gas Production Plant of Changqing Oilfield Branch, Yulin, Shaanxi 719000

  • 4.

    Engineering Technology Management Department of Changqing Oilfield Branch, Xi’an, Shaanxi 710018

  • 5.

    Southwest Oil and Gas Field Development Division, Chengdu, Sichuan 610000

  • Received Date: 2023-02-05
  • Rev Recd Date: 2023-04-21
  • Publish Date: 2023-07-30
    Abstract
  • At present, the research on the flushing efficiency of drilling fluid filter cake in cementing engineering mainly focuses on the flushing condition of the circular hole casing in the middle, while the research on the influence of the hole shape and casing eccentricity on the flushing efficiency of drilling fluid filter cake is less. This study uses the drilling fluid filter cake flushing simulation experimental device to test the influence of eccentricity and flushing flow rate in the elliptical hole on the drilling fluid filter cake flushing efficiency, and analyzes the flow field of the flushing fluid in the annulus based on the computational fluid dynamics (CFD) method, calculates the hydraulic shear force of the flushing fluid, and clarifies the mechanism of the change of the filter cake flushing efficiency. The results show that when the short axis direction in the annulus of the elliptical hole is eccentric, the flushing efficiency of the drilling fluid filter cake is the largest in the long axis direction of the annulus, followed by the wide and short axis direction, and the narrow and short axis direction is the smallest; By increasing the eccentricity of the short axis in the annulus, the flushing efficiency of the drilling fluid filter cake decreases slightly in the long axis direction, increases in the wide and short axis direction, and decreases significantly in the narrow and short axis direction; With the increase of annulus flushing flow, the overall flushing efficiency of annulus drilling fluid filter cake is significantly increased, but the increase of filter cake flushing efficiency in the long axis direction of the annulus is the largest, followed by the wide and short axis, and the narrow and short axis is the smallest.

     

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