title: An oilwell cement slurry additivated with bisphenol diglycidil ether/isophoronediamine--kinetic analysis and multivariate modelings at slurry/HCl interfaces.
abstract: Loss of zonal isolation in oilwell cementing operations leads to safety and environmental problems. The use of new cement slurries can help to solve this problem. In this paper, an epoxy-modified cement slurry was synthesized and characterized. The features of the modified slurries were evaluated in relation to a standard cement slurry (w/c=0.50). A kinetic study of HCl interaction with the slurries was carried out using cubic molds. The Avrami kinetic model appears to be the most efficient in describing kinetic isotherms obtained from 25 to 55 degrees C. Type of slurry, HCl concentration and temperature effects were also evaluated in HCl adsorption onto cement slurries considering a 2(3) full factorial design. From the statistical analysis, it is inferred that the factor "HCl concentration" has shown a profound influence on the numerical values of the Avrami kinetic constants. However, the best statistical fits were found using binary and tertiary interactive effects. It was found that the epoxy-modified cement slurry presents a good potential to be used in environmental-friendly oilwell operations.
authors.affiliation: Department of Chemistry/CCET, Laboratory of Materials and Calorimetry, Sergipe Federal University, Jardim Rosa Elze, CEP 49100-000 São Cristóvão, Sergipe, Brazil. cestari@ufs.br
authors.forename: Antonio R
authors.initials: AR
authors.lastname: Cestari
authors.forename: Eunice F S
authors.initials: EF
authors.lastname: Vieira
authors.forename: Andréa M G
authors.initials: AM
authors.lastname: Tavares
authors.forename: Marcos A S
authors.initials: MA
authors.lastname: Andrade
mesh_terms: D001559:Benzhydryl Compounds; D003514:Cyclohexylamines / Q000737:chemistry*; D004852:Epoxy Compounds / Q000737:chemistry*; D006851:Hydrochloric Acid; D007221:Industry / Q000379:methods*; D007700:Kinetics; D015999:Multivariate Analysis; D010578:Petroleum
chemical_list: D001559:Benzhydryl Compounds; D003514:Cyclohexylamines; D004852:Epoxy Compounds; D010578:Petroleum; D006851:Hydrochloric Acid; C423722:bisphenol F diglycidyl ether; C052964:isophorone diamine