Study of adsorption/desorption properties of a new scale inhibitor package to prevent calcium carbonate formation during water injection in oil reservoirs

For the carbonate samples, adsorption equilibrium of the scale inhibitor package occurred in the lower pore volumes injected. Furthermore, improvement in the adsorption ability of the scale inhibitor package occurred due to the presence of various chemical reagents in the composition of the scale inhibitor package. In this study, desorption process has been also studied on carbonate rocks. The results showed that the best performance of desorption process was obtained when the concentration of hydrochloric acid was 10% in the developed scale inhibitor package. In addition, reduction in dynamic viscosity of oil was observed in the presence of the scale inhibitor package. Interfacial tension on the boundary of oil and the aqueous solution of the scale inhibitor package was significantly reduced by an increase in the concentrations of polyethylene polyamine-N-methylphosphonic acid (PPNMP) and hydrochloric acid as the components of the inhibitor package.