Volume 43 Issue 2
Apr.  2026
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FU Xiongtao, DONG Zhiming, LI Jiajia, et al.Preparation of C-S-H/APC nanoseed and its effect on the early strength of set cement[J]. Drilling Fluid & Completion Fluid，2026, 43（2）：217-222 doi: 10.12358/j.issn.1001-5620.2026.02.010
Citation: FU Xiongtao, DONG Zhiming, LI Jiajia, et al.Preparation of C-S-H/APC nanoseed and its effect on the early strength of set cement[J]. Drilling Fluid & Completion Fluid，2026, 43（2）：217-222 doi: 10.12358/j.issn.1001-5620.2026.02.010
shu

Preparation of C-S-H/APC Nanoseed and Its Effect on the Early Strength of Set Cement

doi: 10.12358/j.issn.1001-5620.2026.02.010
  • 1.

    Changqing cementing company of CNPC Chuanqing Drilling Engineering Co., Ltd, Xi'an, Shaanxi 710018

  • 2.

    Longdong Oil and gas development branch of Changqing Oilfield, Qingyang, Gansu 745100

  • Received Date: 2025-07-14
  • Rev Recd Date: 2025-09-28
  • Publish Date: 2026-04-08
    Abstract
  • Hydrated calcium silicate/polycarboxylic acid nanocrystalline species (C-S-H/PCE) is a kind of nanocomposites with nucleation effect can accelerate the hydration reaction of cement and improve the early strength of cement stone, but the conventional anionic polycarboxylic acid dispersant has strong retarding effect. In this paper, a strongly dispersing and weakly retarding amphoteric polycarboxylic acid dispersant (APC) was firstly synthesized by introducing methacryloyloxyethyltrimethylammonium chloride cationic monomer, and then a hydrated calcium silicate/amphoteric polycarboxylic acid nanocrystalline seed (C-S-H/APC) with high early-strength performance was prepared from the APC, and the structure of the crystal seed was characterized. The compressive strength of C-S-H/APC cementite was 10.8%, 8.2% and 8.9% higher than that of C-S-H/PCE cementite when the addition amount of the crystalline seed was 1%, and the curing time at 20 ℃ was 6 h, 12 h and 24 h. The XRD patterns of C-S-H/APC cementite showed that the Ca(OH)2 diffraction peaks were obviously stronger than that of the blank group, while those of C2S and C3S were lower than that of the blank group, and there were some water-induced and water-soluble peaks in the XRD patterns of the cementite. C2S, C3S, and the diffraction peaks of hydration product AFt were lower than those of the blank group. The SEM image of cement stone shows that the hydration degree of the blank cement stone is very low and the structure is loose, and the structure of the nanometer C-S-H/APC cement stone with the same age of maintenance is denser and the hydration degree of the cement is higher, which indicates that the nanometer C-S-H/APC improves the hydration rate of the cement and accelerates the formation of the spatial network structure of the hydration products, so as to improve the early strength of the cement stone, and the performance of this low-temperature early-strengthening agent slurry system is stable, and it has been used in Changqing Oil Industry. The low-temperature early strength cement slurry performs well and has been successfully applied in the low-temperature wells in the long 6 layers of Ordos Basin of Changqing Oilfield.

     

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