Phase Behavior Analysis of Formation Water after Mixing with Seawater in Waterflooding Using Electrolyte PC-SAFT

Document Type : Research Article

Authors

Faculty of Chemical, Petroleum and Gas Engineering, University of Science and Technology, Tehran, I.R. IRAN

Abstract

Formation water is an important sample of electrolytic solutions. The amount of salts dissolved in water formation affects the volumetric properties of the formation water. In waterflooding, seawater, an electrolytic solution with very low concentrations of salt, forms an electrolytic solution with a high salt dissolved water (formation water), and therefore its properties change. The precise estimation of water formation properties plays an important role in estimating the flooding process. In this study, electrolyte PC-SAFT, in conjunction with Debye-Huckel's theory, was used to model the density and equilibrium of vapor and electrolytic solutions. In this equation, the state of ions is considered independent of the salt-forming it, and each ion needs two parameters of ionic diameter and extra dispersion energy over the usual PC-SAFT parameters. In this study, for the verification of the implementation of this equation, the vapor pressure, and the density of the solutions of sodium chloride, potassium chloride, sodium bromide, sodium sulfate, and lithium sulfate, as well as the vapor pressure of sodium chloride, potassium bromide, sodium bromide, and potassium chloride mixtures was compared with experimental data. Finally, using the validated program, changes in the formation water phase behavior is investigated by combining injectable water and the vapor pressure and molecular volume of their composition are predicted. Using this method, the properties’ changes of formation water are investigated by combining them with sea water in different proportions.

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Main Subjects


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