TY - JOUR
T1 - A computational tool for parameter estimation in EoS: New methodologies and natural gas phase equilibria calculations
AU - Abunahman, Samir S.
AU - dos Santos, Letícia C.
AU - Tavares, Frederico W.
AU - Kontogeorgis, Georgios M.
PY - 2020
Y1 - 2020
N2 - Brazilian pre-salt reservoirs represent the discovery of large amounts of light oil, but at high pressures and containing high concentration of CO2. Proper parameter estimation procedures are essential to perform more accurate predictions of their thermodynamic properties. Therefore, two new methodologies for such calculations have been implemented here: by applying simultaneously VLE and LLE to the metric;and by handling water content in dew point conditions. Utilizing the Cubic-Plus-Association (CPA) EoS, they were employed to obtain new parameters for water. Also, new parameters were obtained forH2O + CO2 mixtures, whose average absolute deviation in water content at high pressures fell from 24% to 3% compared to previous publications. The same procedure was performed for other aqueous mixtures containing H2S and light hydrocarbons. Finally, this study has been applied into a natural gas compressing simulation with CO2, studying streams properties comparing the parameters obtained in this work with the literature.
AB - Brazilian pre-salt reservoirs represent the discovery of large amounts of light oil, but at high pressures and containing high concentration of CO2. Proper parameter estimation procedures are essential to perform more accurate predictions of their thermodynamic properties. Therefore, two new methodologies for such calculations have been implemented here: by applying simultaneously VLE and LLE to the metric;and by handling water content in dew point conditions. Utilizing the Cubic-Plus-Association (CPA) EoS, they were employed to obtain new parameters for water. Also, new parameters were obtained forH2O + CO2 mixtures, whose average absolute deviation in water content at high pressures fell from 24% to 3% compared to previous publications. The same procedure was performed for other aqueous mixtures containing H2S and light hydrocarbons. Finally, this study has been applied into a natural gas compressing simulation with CO2, studying streams properties comparing the parameters obtained in this work with the literature.
KW - Equations of state
KW - Parameter estimation
KW - Computational tool
KW - Natural gas production
U2 - 10.1016/j.ces.2019.115437
DO - 10.1016/j.ces.2019.115437
M3 - Journal article
SN - 0009-2509
VL - 215
JO - Chemical Engineering Science
JF - Chemical Engineering Science
M1 - 115437
ER -