Gas Hydrates on a Chip
Direct visualization of methane hydrate formation, dissociation and CH₄-to-CO₂ replacement under controlled P–T conditions.
| Processes | formation, dissociation, CH₄→CO₂ replacement |
|---|---|
| Micromodels | straight channel, porous network, digital core |
| Fluids | methane, CO₂, water, brines; gas mixtures on request |
| P–T conditions | per system phase diagram; thermostat or cryostat |
| Measurements | pressure and differential, temperature, time, flow, hydrate growth rate |
| Gas analysis | optional, inlet and outlet chromatography |
| Deliverables | report, video, P–T regime map, kinetic curves |
Gas hydrates form in a narrow range of pressure, temperature and composition, and designing production, gas transport and CO₂ storage requires knowing not only the equilibrium boundary but the actual process rate. Bulk cells give an integral signal but do not show nucleation sites or local blocking of pore channels, and CH₄-to-CO₂ replacement is hard to separate from dissociation and re-formation.
Gas and water or brine are fed into a transparent microfluidic chip of the chosen geometry; pressure and temperature follow a program while optics record the process continuously. Induction time, nucleation sites, front growth rate, occupied volume fraction and hydraulic resistance are measured; the hydrate is then dissociated by heating or depressurization or exposed to CO₂.
Tests run on straight channels, porous models and core-based models at different salinity, surface mineralization, cooling rates and gas supply modes. Optical data are synchronized with pressure, temperature, differential pressure and, optionally, inlet and outlet gas composition analysis.
A microfluidic model uses far less CH₄, CO₂ and brine than an autoclave or flow loop and allows rapid comparison of regimes on identical chips. The result is a P–T regime map, kinetic parameters and recommendations for assessing hydrate risks, gas storage and CO₂ replacement.