New insights into the dissociation of mixed CH4/CO2 hydrates for CH4 production and CO2 storage

Recent but limited studies have shown that multistep slow depressurization based on mixed CH4/CO2 hydrate dissociation can enhance CH4 recovery and increases CO2 storage after injection into [1,2]. For the first time, resistivity variation gas was investigated to study change in saturation production/storage yield. Lab-scale rich hydrates were synthesized mimic production well scenario. The sandstone with moderate high water using two different mixtures. Furthermore, dissociated three six steps cyclic depressurization. Pressure, chromatography data collected. presence of thermodynamic stability zones provided an opportunity for additional during dissociation. Gas migration between caused reformation, improvement sweep area movement front toward well. Multiple peaks suggest major reformation. Peak values independent type. Peaks occurred at pressure than peak hydrates. slight resistance below pure confirms loss mass recovered by formation mass. This discusses correlation type guest molecule its concentration initial saturation. results this will be useful explore application improve storage.