Volume 39 Issue 6
Nov.  2022
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AN Jintao, LI Jun, HUANG Honglin, et al.Performance optimization of slim-hole drilling fluids under hole cleaning condition[J]. Drilling Fluid & Completion Fluid，2022, 39（6）：700-706 doi: 10.12358/j.issn.1001-5620.2022.06.006
Citation: AN Jintao, LI Jun, HUANG Honglin, et al.Performance optimization of slim-hole drilling fluids under hole cleaning condition[J]. Drilling Fluid & Completion Fluid，2022, 39（6）：700-706 doi: 10.12358/j.issn.1001-5620.2022.06.006
shu

Performance Optimization of Slim-Hole Drilling Fluids Under Hole Cleaning Condition

doi: 10.12358/j.issn.1001-5620.2022.06.006
  • 1.

    College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249

  • 2.

    China University of Petroleum (Beijing) Karamay Campus, Karamay, Xinjiang 834000

  • Received Date: 2022-06-16
  • Rev Recd Date: 2022-07-11
  • Publish Date: 2022-11-30
    Abstract
  • In Xinjiang Oilfield, part of the Mahu block is developed with long horizontal (exceeds 2000 m) slim holes. In drilling operation, pipe sticking resulted from poor hole cleaning and mud losses resulted from excessive wellbore pressure seriously restricted the efficient and economic development of the block. One of the key methods to solve these problems is the optimization of the drilling fluid properties. Using CFD numeric simulation method, a model describing the solid liquid two-phase flow in annular spaces was established, and the effects were investigated of different mud rheological parameters (Herschel-Bulkley rheological model) on the migration of the drilled cuttings and the annular pressure losses under different drilling parameters. Th numeric simulation results show that (1) an increase in drilling fluid density is beneficial to the carrying capacity of the drilling fluid; (2) the effects of the mud rheological parameters on the migration of drilled cuttings vary under different drilling parameters; (3) higher mud rheological parameters do not necessarily aid in cuttings migration; (4) an optimum mud rheology range was determined for the drilling operation in the Mahu block based on its characteristics, and the optimum mud rheology range has been successfully used in field operations.

     

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