Study on the preparation and evaluation of additive systems for extending the thickening time of well cement for application in oil and gas drilling operations
DOI:
https://doi.org/10.62239/jca.2025.054Keywords:
Thickening time, additive, oil and gas well, cement slurry, cement sheathAbstract
The article investigates the relationship between the characteristic structure and application performance of a thickening-time retarding additive for cement slurries and cement stones used in oil well cementing. SEM images show a more uniform microstructure, while XRD indicates that the α-SiO₂ peak at 2θ ≈ 26.6° remains clear, and the Ca₃SiO₅ peak appears with higher intensity, reflecting a retarded hydration process due to the additive. FT-IR spectra reveal absorption bands similar to commercial samples, with slight shifts. Particle size analysis shows a finer and more uniform system: D50 decreases from 25.259 µm to 17.101 µm, and the most frequent particle size decreases from 31.982 µm to 21.393 µm.
In terms of application, the additive prolongs the slurry thickening time to 6 hours 58 minutes at 0.10 gps, remaining stable under high temperature and pressure. Permeability is nearly unchanged, while porosity improves (21.023% vs. 22.604%). The maximum compressive stress increases, indicating better load-bearing capacity and stability, confirming the additive’s practical effectiveness.
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Copyright (c) 2025 Nguyen Tran Doanh, Tran Viet Hoang, Dao Quoc Tuy, Le Manh Hung
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