Study of the formation mechanisms of CO₂ hydrates from matching the experimental data with a porous media setting by multiphase flow-geochemical-thermal reservoir simulator

In this study, a multiphase flow-geochemical-thermal reservoir simulator, CMG STARS, was used to build a reliable reaction module of the CO₂ hydrate formation based on laboratory test results in order to investigate the behaviors of CO₂ hydrate formation. This research was based on experiments conducted in previous studies by the team from the National Taiwan University of Science and Technology (NTUST). For the experimental data matching, a sensitivity analysis was conducted to understand the effects of flow property, reaction, and thermal property parameters on the behaviors of CO₂ hydrate formation. This study successfully established a CO₂ hydrate reaction module based on a good history matching. Both the experiment and simulation demonstrated that the CO₂ hydrate is formed at the interface between the water and gas. The concentration, accumulation, and distribution of the CO₂ hydrate affected by the free gas transport was observed in the simulation.