Synthesis, characterization and hydration analysis of a novel epoxy/superplasticizer oilwell cement slurry – Some mechanistic features by solution microcalorimetry

• Published in: Journal of colloid and interface science 2013-02, Vol.392, p.359-368
• Main Authors: Cestari, Antonio R., Vieira, Eunice F.S., Silva, Ellen C.S., Alves, Fernanda J., Andrade, Marcos A.S.
• Format: Article
• Language: English
• Subjects: aqueous solutions; Calorimetry; cement; Cements; Chemistry; Contact; Diffusion; Eco-friendly materials; epoxides; Epoxy Compounds - chemical synthesis; Epoxy Compounds - chemistry; Epoxy resins; Exact sciences and technology; General and physical chemistry; heat production; Hydration; hydrochloric acid; Kinetic modeling; Molecular Structure; Oilwell cement slurries; Plasticizers; Polyacrylates; Polymers - chemical synthesis; Polymers - chemistry; reflectance spectroscopy; Reflectivity; Slurries; Solution calorimetry; Solution microcalorimetry; Solutions; Superplasticizers; Synthesis; X-ray diffraction
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2012.04.037

[Display omitted] ► A new epoxy/polyacrylate-modified oilwell cement slurry was synthesized. ► The morphological features of the new slurry were preserved after contact with HCl. ► The hydration processes were well fitted to a three-parameter kinetic model. ► Diffusional growth is the main mechanistic feature of new cement slurry hydration. ► The new cement slurry has good features for using in acidic environments of oilwells. A new epoxy/polyacrylate-modified oilwell cement slurry was synthesized. The features of the new slurry were evaluated in relation to a standard cement slurry (w/c=0.5). The characterization of the slurries was performed by Raman, XRD, TG/DTG and solid-state diffuse reflectance spectroscopy. The main morphological features of the new slurry were preserved, even after long-term contact with HCl in aqueous solution. The hydration of the slurries was studied by heat-conduction microcalorimetry. The exothermic microcalorimetric outputs were well fitted to a three-parameter kinetic model. The analysis of both thermodynamic and kinetic results from microcalorimetry have pointed out that diffusional growth from non-stoichiometric mixtures is the main mechanistic feature of the hydration of the cement slurries. The results of this study underline the excellent features of the new epoxy/superplasticizer-modified cement slurry for using in severe acidic environments of oilwells.