About this Abstract |
Meeting |
6th International Congress on 3D Materials Science (3DMS 2022)
|
Symposium
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6th International Congress on 3D Materials Science (3DMS 2022)
|
Presentation Title |
Dynamic In-situ Imaging of Methane Hydrate Formation and Self-preservation in Porous Media |
Author(s) |
Viktor Nikitin |
On-Site Speaker (Planned) |
Viktor Nikitin |
Abstract Scope |
We present the results of dynamic in-situ 3D X-ray imaging of methane hydrates microstructure during methane hydrate formation and dissociation in sand samples. Short scanning times and high resolution provided by synchrotron X-rays allowed for better understanding of water movement and different types of gas-hydrate formation. Complementing previous observations, we conclude that gas-hydrate formation is accompanied by the water movements caused by cryogenic water suction that happens in sequences of short fast movements with longer equilibrium states in between (when the water is immobile). Based on the 3D microstructure we identified two types of gas-hydrate formation: i) into the gas pockets and ii) inside water volumes. The rate of dissociation in the self-preservation mode (pressure drop at negative temperatures) appears to be different for these two types of gas hydrates. This means that the history of gas-hydrate formation may influence its behaviour at the dissociation stage (e.g. gas-hydrate production). |
Proceedings Inclusion? |
Definite: Other |