Speaker
Description
Geological storage of carbon dioxide (CO2) is a pivotal strategy for mitigating anthropogenic greenhouse gas emissions. During CO2 injection, hydrate formation driven by Joule-Thomson cooling presents critical challenges to reservoir injectivity and long-term storage integrity due to pore blockage and permeability reduction. However, the kinetics and morphology of hydrate at the pore scale, particularly under varying pore geometries and pressure perturbations, remain insufficiently understood.
This study employs a high-resolution microfluidic experimental platform combined with image analysis to systematically investigate CO2 hydrate formation and dissociation dynamics under controlled thermodynamic and hydrodynamic conditions. Five systematic experiments explore hydrate dynamics across varying pore geometries, CO2 phases (gas and liquid), water saturations, and transient pressure perturbations. Nine distinct hydrate morphologies are directly captured and quantified, including pore-filling, grain-coating, worm-like, banded-like, laminated-like, and capillary films, which are strongly influenced by pore geometry and pressure fluctuations. Results indicate that liquid-phase CO2 and transient pressure disturbances significantly accelerate hydrate nucleation and growth rates, producing more stable and extensive hydrate clusters compared to gas-phase conditions.
The study finds a stochastic nature of hydrate nucleation influenced by local water-gas distribution and highlights hysteresis behavior during hydrate dissociation influenced by pore confinement and capillary forces. Furthermore, we observed the pore-scale Joule-Thomson cooling and its effect on the hydrate behaviour, especially the significant local temperature reduction and the hydrate streams inside the pore network. These findings provide novel insights into microscale hydrate kinetics, which emphasize the critical roles of pore structure and dynamic pressure in governing hydrate formation
| Country | Netherlands |
|---|---|
| Green Housing & Porous Media Focused Abstracts | This abstract is related to Green Housing |
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