Abstract
The emulsions can improve the performance of cement or concrete, such as toughness and cementing strength and anti-permeability, so the emulsion cements have been of great scientific and technological interest for oil-well cementing. In this paper, a soap-free emulsion was synthesized utilizing anionic reactive emulsifiers and can be used in the oil-well cement system. Fourier transform infrared spectroscopy was applied to test the presence of copolymers. Transmission electron microscopy was used to study the structure of the nano-particles. The stability of the soap-free emulsion and the conventional emulsion against presence of additives (such as acid, alkali, salt, alcohol and the filtrate of cement slurry) was compared. The result indicated some characteristics of the soap-free emulsion. The particles of the soap-free emulsion were uniform and monodisperse. The minimum film-forming temperature and glass transition temperature (T g) of the soap-free emulsion were lower than that of the conventional emulsion. Compared with the conventional emulsion, the soap-free emulsion had a better stability against additives. When the soap-free emulsion was used in oil-well cement system, the emulsion could effectively control the free water and filtration of the cement slurry. The plastic deformation of the emulsion cement was higher than that of blank cement paste. It could be expected that the soap-free emulsion is suitable for application in oil-well cement.
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Acknowledgments
This study was supported by the “Twelve-Five” major national science and technology project (2011ZX05022-006-005HZ) from MOST (Ministry of Science and Technology, People’s Republic of China).
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Jiao, Lb., Chen, Dj., Feng, Dy. et al. Potential for significantly improving performances of oil-well cement by soap-free emulsions. Mater Struct 49, 279–288 (2016). https://doi.org/10.1617/s11527-014-0495-0
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DOI: https://doi.org/10.1617/s11527-014-0495-0