Vafa Feyzi - Ahvaz Petroleum Faculty, Petroleum University of Technology (PUT), Ahvaz, Iran
Vahid Mohebbi - Ahvaz Petroleum Faculty, Petroleum University of Technology (PUT), Ahvaz, Iran

In this study a new kinetic model is proposed for CO2-Methane replacement in hydrate structure. The work is a novel method to predict production of naturally occurring methane hydrate deposits and CO2 storage take occur simultaneously. This kinetic model is developed based on the mechanism proposed for replacement in the hydrate structure in the presence of excess water as a slurry phase of methane hydrate. According to this mechanism, partial breakage of methane hydrate cages, methane-CO2 substitution and formation of mixed CO2/CH4 hydrate proceed simultaneously. Pure methane hydrate dissociation, pure CO2 hydrate formation and CO2/CH4 mixed hydrate formation kinetic parameters are evaluated experimentally and applied in the proposed model. Sensitivity analysis on the developed kinetic model indicates that CO2 hydrate formation would be the rate controlling step in CO2-CH4 replacement mechanism.

Gas Hydrate, Methane, Carbon Dioxide, Replacement, Kinetics