A novel and efficient epoxy/chitosan cement slurry for use in severe acidic environments of oil wells-Structural characterization and kinetic modeling.
In this study, the biopolymer chitosan was used to synthesize a new epoxy/chitosan cement slurry. The features of the new slurry were evaluated in relation to a standard cement slurry (w/c=0.5). A kinetic study of the interaction epoxy/chitosan slurry/HCl was performed to simulate the use of the new slurry in environmental-friendly acidizing procedures of oil wells. The experimental data were well fitted to a three-parameter kinetic model. The analysis of the kinetic modeling suggests that surface reactions constitute the main interactions at the interface epoxy/chitosan-modified cement slurry/HCl. The characterization of the slurries was performed by FTIR, XRD, TG/DTG and solid-state reflectance spectroscopy. The results have pointed out that the main features of the new cement slurry were preserved, even after long-term contact with HCl in aqueous solution. The results of this study underline the excellent features of the new epoxy/chitosan-modified cement slurry for using in environmental-friendly acidizing procedures of oil wells.
Laboratory of Materials and Calorimetry, Department of Chemistry/CCET, University Federal of Sergipe, 49100-000, São Cristóvão, Sergipe, Brazil. cestari@ufs.br
Antonio R
AR
Cestari
Eunice F S
EF
Vieira
Fernanda J
FJ
Alves
Ellen C S
EC
Silva
Marcos A S
MA
Andrade
D000465:Algorithms; D000588:Amines / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry*; D003252:Construction Materials; D003432:Cross-Linking Reagents; D004055:Differential Thermal Analysis; D004853:Epoxy Resins / Q000737:chemistry*; D006851:Hydrochloric Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007700:Kinetics; D008956:Models, Chemical; D061329:Oil and Gas Fields; D012822:Silicon Dioxide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014961:X-Ray Diffraction
D000588:Amines; D003432:Cross-Linking Reagents; D004853:Epoxy Resins; D007202:Indicators and Reagents; D012822:Silicon Dioxide; D048271:Chitosan; D006851:Hydrochloric Acid