Volume 43 Issue 5
Oct.  2026
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Wang Hao, Li Jingbin, Li Peisen, et al.Parametric analysis of a coordinated temperature-control strategy for drilling fluid in ultra-deep wells[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：640-648 doi: 10.12358/j.issn.1001-5620.2026.05.008
Citation: Wang Hao, Li Jingbin, Li Peisen, et al.Parametric analysis of a coordinated temperature-control strategy for drilling fluid in ultra-deep wells[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：640-648 doi: 10.12358/j.issn.1001-5620.2026.05.008
shu

Parametric analysis of a coordinated temperature-control strategy for drilling fluid in ultra-deep wells

doi: 10.12358/j.issn.1001-5620.2026.05.008

  • State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249

  • Received Date: 2026-02-25
  • Accepted Date: 2026-03-25
  • Rev Recd Date: 2026-03-18
  • Publish Date: 2026-10-01
    Abstract
  • With the increasing depletion of shallow oil and gas resources, the exploration and development of deep and ultra-deep reservoirs have progressively become the primary focus. However, high bottomhole temperatures pose a critical challenge to the safe and efficient drilling of ultra-deep wells. This study proposes a coordinated temperature control method for drilling fluid, combining surface ice-particle cooling and downhole thermal insulation. Based on a case study of an 8,543 m ultra-deep well in the Tarim Basin, a transient wellbore heat transfer model was established to systematically analyze the influence of multiple factors on the circulating bottomhole temperature. An optimized wellbore temperature control strategy was subsequently proposed. The results demonstrate that insulating the drill pipe effectively reduces the bottomhole temperature, with performance improving as the thermal conductivity of the coating decreases. Among the operating parameters, drilling fluid flow rate has the most significant impact—bottomhole temperature decreases as the flow rate increases. Regarding thermophysical properties, heat capacity and density exhibit a stronger influence on bottomhole temperature, whereas thermal conductivity and viscosity play relatively minor roles, primarily affecting the convective heat transfer process by altering the Nusselt number. Furthermore, thermal insulation significantly enhances the cooling effect of other parameters, particularly the inlet temperature. Without insulation, reducing the inlet temperature from 80 ℃ to 0 ℃ only affects the shallow section, leaving the bottomhole temperature nearly unchanged. In contrast, with insulation, the same inlet temperature drop reduces the bottomhole temperature by approximately 28 ℃. Therefore, effective temperature control in ultra-deep wells requires the synergistic application of multiple technical measures. This study provides theoretical guidance for managing the wellbore temperature field during deep drilling operations.

     

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