Volume 43 Issue 5
Oct.  2026
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2026  >  43(5): 620-630
Wang Maoren, Liang Hongrui, Shi Yujie, et al.Laboratory study on phase change microcapsules dm@sio2 for drilling fluids[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：620-630 doi: 10.12358/j.issn.1001-5620.2026.05.006
Citation: Wang Maoren, Liang Hongrui, Shi Yujie, et al.Laboratory study on phase change microcapsules dm@sio2 for drilling fluids[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：620-630 doi: 10.12358/j.issn.1001-5620.2026.05.006
shu

Laboratory Study on Phase Change Microcapsules DM@SiO2 for Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2026.05.006
  • 1.

    Karamay Campus, China University of Petroleum (Beijing), Karamay, Xinjiang 843000

  • 2.

    Exploration Division of CNPC Xinjiang Oilfield Company, Karamay, Xinjiang 843000

  • 3.

    Drilling Fluid Division of CNPC Western Drilling Engineering Company Limited, Karamay, Xinjiang 843000

  • Received Date: 2026-04-11
  • Rev Recd Date: 2026-05-29
  • Publish Date: 2026-10-01
    Abstract
  • To explore the potential of phase change microcapsules (PCMs) in temperature regulation within ultra-deep wellbores, this study successfully prepared PCMs DM@SiO2 with D-mannitol (DM) as the core material and an inorganic shell layer of SiO2 by the sol-gel method. The morphology, chemical structure, crystal form, heat storage performance, and thermal stability of DM@SiO2 were systematically analyzed through scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and simultaneous thermal analysis (STA). Additionally, numerical simulations of wellbore heat transfer were conducted. The results indicated that the DM@SiO2 particles were intact with a clear core-shell structure. The phase change latent heat reached 224.59 J/g, and the encapsulation efficiency was 76.76%. Performance evaluations showed that under a high-temperature condition of 180 ℃, at addition amounts of 10% and 15%, DM@SiO2 maintained white oil at 167 ℃ for 6 min and 10 min, respectively, demonstrating a significant cooling delay effect. Meanwhile, it exhibited excellent thermal stability, shear resistance, alkali resistance, and compatibility with oil-based drilling fluids. Numerical simulation results revealed that DM@SiO2 could form a 167 ℃ isothermal phase-change zone at well depths of 9000 m and 10 000 m. In the 9 000 m well, this isothermal zone extended to the bottom hole. For the 10 000 m well, the maximum length of the isothermal zone reached 2.869 km at DM@SiO2 addition amount of 15%. DM@SiO2 could also significantly reduce the fluid temperature in the high-temperature section. DM@SiO2 holds promising application prospects for lowering wellbore temperatures during drilling fluid circulation.

     

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