Control over Cement Setting Through the Use of Chemically Modified Fly Ash
✍ Scribed by C. Lupu; K. L. Jackson; S. Bard; I. Rusakova; A. R. Barron
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 163 KB
- Volume
- 8
- Category
- Article
- ISSN
- 1438-1656
No coin nor oath required. For personal study only.
✦ Synopsis
The chemical treatment of Class C fly ash with a 0.2 wt% of CaCO~3~ solution results in dramatic increase in setting time and superior stability during the induction period for cement slurries at temperature conditions relevant for down‐hole applications. The performance of the CaCO~3~ treatment appears to be a consequence of each fly ash particle being provided with the necessary Ca prior to hydration without being dependant on cement‐fly ash particle interactions. Thus, the setting process is no longer dependent on the particle shape, packing and dispersion of the fly ash and cement. That with the extended setting times, the induction period follows almost ideal shape is most important for oil well applications where it is necessary to pump a specific viscosity slurry over large distances within a specific time, without changes in viscosity that would effect pump rates.