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Updated: Jul 13, 2026

Methane Hydrate Crystallization on Sessile Water Droplets
Published on: May 26, 2021
Phase field modeling of CH4 hydrate conversion into CO2 hydrate in the presence of liquid CO2
1Research Institute for Solid State Physics and Optics, H-1525, POB 49, Budapest, Hungary.
Abstract:
We present phase field simulations to estimate the conversion rate of CH(4) hydrate to CO(2) hydrate in the presence of liquid CO(2) under conditions typical for underwater gas hydrate reservoirs. In the computations, all model parameters are evaluated from physical properties taken from experiment or molecular dynamics simulations. It has been found that hydrate conversion is a diffusion controlled process, as after a short transient, the displacement of the conversion front scales with t(1/2). Assuming a diffusion coefficient of D(s) = 1.1 x 10(-11) m(2) s(-1) in the hydrate phase, the predicted time dependent conversion rate is in reasonable agreement with results from magnetic resonance imaging experiments. This value of the diffusion coefficient is higher than expected for the bulk hydrate phase, probably due to liquid inclusions remaining in the porous sample used in the experiment.
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