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.