Volume 43 Issue 4
Jul.  2026
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Liu Yan, Yang Zengmin, Ren Qiang, et al.Preparation and mechanism of HEDP-intercalated hydrotalcite retarder[J]. Drilling Fluid & Completion Fluid,2026, 43(4):522-533 doi: 10.12358/j.issn.1001-5620.2026.04.011
Citation: Liu Yan, Yang Zengmin, Ren Qiang, et al.Preparation and mechanism of HEDP-intercalated hydrotalcite retarder[J]. Drilling Fluid & Completion Fluid,2026, 43(4):522-533 doi: 10.12358/j.issn.1001-5620.2026.04.011

Preparation and Mechanism of HEDP-Intercalated Hydrotalcite Retarder

doi: 10.12358/j.issn.1001-5620.2026.04.011
  • Received Date: 2026-01-28
  • Rev Recd Date: 2026-03-01
  • Publish Date: 2026-07-30
  • To address the problem of slow strength development of the top cement with retarders at large temperature differences, a 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) intercalated hydrotalcite Mg/Al-HEDP-LDH retarder was developed for use in large temperature difference environment. The retarder was prepared by intercalating HEDP in between the layers of hydrotalcite. Performance evaluation of the retarder in cement slurries shows that the optimal conditions for preparing Mg/Al-HEDP-LDH are as follows: pH = 4.5, crystallization temperature = 150 ℃, and crystallization time = 6 hours. The HEDP molecules between the layers of Mg/Al-HEDP-LDH is released during the hydration process of the cement particles to act as a retarder. At a concentration between 0.3% and 0.7%, Mg/Al-HEDP-LDH performs in a stable manner; with an increase of the concentration of Mg/Al-HEDP-LDH, the thickening time of the cement slurry increases. Mg/Al-HEDP-LDH increases the early strength of a cement slurry; at concentrations of 0.3%, 0.5% and 0.7%, the 1-day, 3-day, 7-day and 14-day strengths of the set cement are all higher than that of the blank cement slurry, especially the 1-day and the 3-day strengths, which increase significantly. The maximum 3-day strength is 92.9% – 103.6% higher than that of the blank cement slurry. The novel intercalated hydrotalcite Mg/Al-HEDP-LDH has retarding capacity in cement slurries, and can promote the development of the early strength of set cement.In summary, the novel intercalated hydrotalcite material Mg/Al-HEDP-LDH exhibits a retarding effect in cement slurry and can promote the development of the early strength of set cement.

     

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