A comparative performance evaluation of cubic equations of state for predicting the compositional distribution of hydrate inhibitors in reservoir fluid systems

This study presents a comparative computational examination of different cubic equations state (EoS) on hydrate inhibition fluid systems involving real reservoir fluids. Two gas inhibitors (Monoethylene glycol – MEG and methanol) were considered alongside 4 EoS namely; Cubic-Plus-Association (CPA) coupled with Infochem mixing rules, Soave-Redlich-Kwong (SRK) the Huron-Vidal (HV) rule, Peng Robinson HV rule Predictive-Soave-Redlich-Kwong PSRK-type rule. Pressure-Temperature (PT) flash calculations carried out using MultiflashTM software (version 6.1) obtained results compared experimental data from various literature. The tested Cubic successfully modelled distribution water, inhibitor hydrocarbons in complex mixtures at conditions CPA performing best. PSRK produced farthest data.