Volume 43 Issue 5
Oct.  2026
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2026  >  43(5): 631-639
Wang Guoshuai, Sun Jun, Feng Yong, et al.An amphoteric copolymer coated carbon nanotube low viscosity filter loss reducer with high cationicity[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：631-639 doi: 10.12358/j.issn.1001-5620.2026.05.007
Citation: Wang Guoshuai, Sun Jun, Feng Yong, et al.An amphoteric copolymer coated carbon nanotube low viscosity filter loss reducer with high cationicity[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：631-639 doi: 10.12358/j.issn.1001-5620.2026.05.007
shu

An Amphoteric Copolymer Coated Carbon Nanotube Low Viscosity Filter Loss Reducer with High Cationicity

doi: 10.12358/j.issn.1001-5620.2026.05.007
  • 1.

    Drilling & Production Engineering Technology Research Institute of CNPC Chuanqing Drilling Engineering Co., Ltd., Guanghan, Sichuan 618300

  • 2.

    Sichuan Provincial Key Laboratory of Oil & Gas Field Applied Chemistry, Guanghan, Sichuan 618300

  • 3.

    Drilling Fluid Technical Service Company of CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, Sichuan 610051

  • Received Date: 2026-04-18
  • Rev Recd Date: 2026-05-26
  • Publish Date: 2026-10-01
    Abstract
  • High density saturated saltwater drilling fluids at 220 ℃ have rheology, filtration rate and stability that are difficult to control. To address this issue, a low-viscosity fluid loss reducer CNT/ZPE was developed. CNT/ZPE uses carbon nanotube (CNT) as the rigid carrier, and is synthesized through the cation-π and π-π stacking interactions between nitrogen cations/aromatic rings and CNTs. In a CNT/ZPE molecule, the CNT is coated with high cationicity amphoteric copolymer ZPE. Using CNT/ZPE as the sole copolymer fluid loss reducer, a high density saturated saltwater drilling fluid that can be used at temperatures up to 220 ℃ was formulated with other conventional drilling fluid additives. The results of Fourier transform infrared spectroscopy and transmission electron microscopy analyses show that the CNT/ZPE molecules contain the designed quaternary ammonium cations, benzene rings and sulfonic acid groups etc., and the surfaces of CNTs are successfully coated with high cationicity amphoteric copolymer molecules. A salt-saturated base mud (containing 36% NaCl) and a calcium base mud (containing 2% CaCl2) treated with 3% CNT/ZPE have API filtration rate of only 5.4 mL and 6.0 mL after aging at 220 ℃, respectively. The apparent viscosity (AV) of 1% CNT/ZPE water solution is only 5mPa·s, lower than the AVs of the water solutions of other regularly used low-viscosity copolymer fluid loss reducers, such as DSP-1, PSP and SO-1 at the same concentration. The formulated saturated saltwater drilling fluid, at densities between 2.0 g/cm3 and 2.3 g/cm3, have reasonable rheological parameters and controllable high-temperature high-pressure fluid loss after aging at 220 ℃ for 16 hours and 48 hours, respectively. It is resistant to the contamination of 0.7%CaCl2, and is able to satisfy the requirements of field drilling operations. This study also provides a new strategy for developing CNT-based polymer compound materials for use in drilling fluids.

     

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