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<p>To address the excessive retardation of oil well cement caused by polycarboxylate dispersants (PCE), this study synthesized a zwitterionic polycarboxylate dispersant (DPC). Its molecular structure and weight were characterized using <sup>1</sup>H nuclear magnetic resonance and gel permeation chromatography, respectively. The dispersion effect of DPC in cement slurries was evaluated by analyzing microstates, particle size distribution, Zeta potential, and rheological properties, and compared with acetone formaldehyde sulfite condensates (AFS) and conventional anionic polycarboxylate dispersants (CPC). The influence of DPC on cement hydration was studied through thickening performance, compressive strength, semi-adiabatic calorimetry, and X-ray diffraction. DPC effectively disrupted particle flocculation in cement slurry, reducing the median particle size from 34.4&#xa0;μm to 10.2&#xa0;μm. At a dosage of 0.20%, the slurry with DPC exhibited superior flowability compared to CPC and AFS. DPC induced Newtonian fluid behavior with weaker thixotropy and significantly reduced retardation effects. The 24-h compressive strength of cement stones reached 39.7&#xa0;MPa, the thickening time was about 83&#xa0;min, and the hydration heat peak occurred earlier. Adsorption studies indicated that DPC disperses through steric hindrance and the synergistic anchoring effects of cations and anions. Overall, DPC demonstrates high dispersibility and lower retardation, making it a promising additive for oil and gas well cementing.</p>

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Preparation of Zwitterionic Polycarboxylate Dispersant and its Influence on Rheological Properties and Dispersion Mechanism of Oil Well Cement

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Xuejie Li,
  • Zhigang Peng,
  • Qian Feng,
  • Yong Zheng,
  • Xiaofeng Zhang,
  • Haojun Zhang,
  • Yu Long,
  • Yunao Zhang,
  • Jun Zhou

摘要

To address the excessive retardation of oil well cement caused by polycarboxylate dispersants (PCE), this study synthesized a zwitterionic polycarboxylate dispersant (DPC). Its molecular structure and weight were characterized using 1H nuclear magnetic resonance and gel permeation chromatography, respectively. The dispersion effect of DPC in cement slurries was evaluated by analyzing microstates, particle size distribution, Zeta potential, and rheological properties, and compared with acetone formaldehyde sulfite condensates (AFS) and conventional anionic polycarboxylate dispersants (CPC). The influence of DPC on cement hydration was studied through thickening performance, compressive strength, semi-adiabatic calorimetry, and X-ray diffraction. DPC effectively disrupted particle flocculation in cement slurry, reducing the median particle size from 34.4 μm to 10.2 μm. At a dosage of 0.20%, the slurry with DPC exhibited superior flowability compared to CPC and AFS. DPC induced Newtonian fluid behavior with weaker thixotropy and significantly reduced retardation effects. The 24-h compressive strength of cement stones reached 39.7 MPa, the thickening time was about 83 min, and the hydration heat peak occurred earlier. Adsorption studies indicated that DPC disperses through steric hindrance and the synergistic anchoring effects of cations and anions. Overall, DPC demonstrates high dispersibility and lower retardation, making it a promising additive for oil and gas well cementing.