Volume 43 Issue 1
Feb.  2026
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2026  >  43(1): 28-34
XIAO Sizhuo, SHI Yuzhao, SUN Yanyu, et al.The influence of the synergistic effect between thermo-responsive polymers and bentonite on the rheology of water-based drilling fluids[J]. Drilling Fluid & Completion Fluid，2026, 43（1）：28-34 doi: 10.12358/j.issn.1001-5620.2026.01.004
Citation: XIAO Sizhuo, SHI Yuzhao, SUN Yanyu, et al.The influence of the synergistic effect between thermo-responsive polymers and bentonite on the rheology of water-based drilling fluids[J]. Drilling Fluid & Completion Fluid，2026, 43（1）：28-34 doi: 10.12358/j.issn.1001-5620.2026.01.004
shu

The Influence of the Synergistic Effect between Thermo-Responsive Polymers and Bentonite on the Rheology of Water-Based Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2026.01.004
  • 1.

    School of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100

  • 2.

    Sinopec. Shengli Petroleum Engineering Co., Ltd., Dongying, Shandong 257000

  • 3.

    Research Institute of Oil and Gas Technology, Jilin Oilfield Company, PetroChina, Songyuan, Jilin 138000

  • 4.

    Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering, Wuhan, Hubei 430100

  • Received Date: 2025-07-18
  • Rev Recd Date: 2025-08-25
    • Available Online: 2026-02-09
  • Publish Date: 2026-02-09
    Abstract
  • To address the challenge of drilling fluid rheology instability resulted from high-temperature degradation of conventional polymers, three polymers PAANVCL, PAADEAM and PAANIPAM, with different thermo-responsive groups, were synthesized via free-radical polymerization using thermo-responsive monomers, including N-vinyl caprolactam (NVCL), N,N-diethylacrylamide (DEAM) and N-isopropylacrylamide (NIPAM), and hydrophilic monomers, including acrylamide (AM) and sodium 2-acrylamido-2-methylpropylsulfonate (NaAMPS). The lower critical solution temperature (LCST) of the polymer solutions was determined by the turbidimetric method, the structural changes of the polymers before and after interaction with bentonite were characterized using Fourier transform infrared spectroscopy (FT-IR), and the interactions between the polymers with different thermo-responsive groups and bentonite were comparatively analyzed via X-ray diffraction (XRD), Zeta potential measurement and isothermal adsorption test. Additionally, the influence of thermo-responsive group types on the high-temperature rheology of the polymers in bentonite-based slurries was investigated. It was found that the LCST of the thermo-responsive polymer PAANVCL is as high as 85℃, and those of the polymers PAADEAM and PAANIPAM are 77℃ and 73℃, respectively. At room temperature and 90℃, PAANVCL exhibits the highest adsorption capacity on bentonite particles, followed by PAADEAM and PAANIPAM. After aging at 160℃ for 16 hours, the retention rate of the apparent viscosity (AV) of the PAANVCL-bentonite water-based drilling fluid is 81.13%, compared with 72.52% for the PAADEAM-bentonite drilling fluid and 69.44% for the PAANIPAM-bentonite drilling fluid. Furthermore, at temperatures between 100℃ and 160℃, the AV, plastic viscosity (PV) and yield point (YP) of the PAANVCL-bentonite drilling fluid fluctuate in ranges of less than 15%, demonstrating good high-temperature rheological stability. The types of the thermo-responsive groups exhibit significant impact on the interaction between polymers and bentonite; PAANVCL, a polymer with cyclic thermo-responsive groups, exhibits superior rheological stability in water-based drilling fluids.

     

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