title: Synthesis, characterization and hydration analysis of a novel epoxy/superplasticizer oilwell cement slurry--some mechanistic features by solution microcalorimetry.
abstract: 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.
authors.affiliation: Laboratory of Materials and Calorimetry, Department of Chemistry/CCET, Federal University of Sergipe, 49100-000 São Cristóvão, Sergipe, Brazil. Electronic address: cestari@ufs.br.
authors.forename: Antonio R
authors.initials: AR
authors.lastname: Cestari
authors.affiliation: Laboratory of Materials and Calorimetry, Department of Chemistry/CCET, Federal University of Sergipe, 49100-000 São Cristóvão, Sergipe, Brazil.
authors.forename: Eunice F S
authors.initials: EFS
authors.lastname: Vieira
authors.affiliation: Laboratory of Materials and Calorimetry, Department of Chemistry/CCET, Federal University of Sergipe, 49100-000 São Cristóvão, Sergipe, Brazil.
authors.forename: Ellen C S
authors.initials: ECS
authors.lastname: Silva
authors.affiliation: Laboratory of Materials and Calorimetry, Department of Chemistry/CCET, Federal University of Sergipe, 49100-000 São Cristóvão, Sergipe, Brazil.
authors.forename: Fernanda J
authors.initials: FJ
authors.lastname: Alves
authors.affiliation: Laboratory of Materials and Calorimetry, Department of Chemistry/CCET, Federal University of Sergipe, 49100-000 São Cristóvão, Sergipe, Brazil.
authors.forename: Marcos A S
authors.initials: MAS
authors.lastname: Andrade
mesh_terms: D002151:Calorimetry; D004852:Epoxy Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D015394:Molecular Structure; D010968:Plasticizers; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry*; D012996:Solutions
chemical_list: D004852:Epoxy Compounds; D010968:Plasticizers; D011108:Polymers; D012996:Solutions