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Abstract
This paper reports the formation and dissociation pattern of hydrate crystals with varying compositions of CH4 and CO2 in porous media. Direct visualization was carried out using a high-pressure, w...
Highlights
Gas hydrates are ice-like crystalline substances formed when guest molecules, such as methane (CH4) or carbon dioxide (CO2), react with water at moderate-to-high pressures and low temperatures
A collection of mixed hydrates with compositions ranging between pure CH4 hydrates and pure CO2 hydrates will form in the reservoir during the CO2 injection
The hydrate film continued to grow slowly during the 16 h (Figure 2f), but neither was crystallization of hydrates observed in the water phase nor was the CO2 phase fully consumed by hydrate formation in this experiment
Summary
Gas hydrates are ice-like crystalline substances formed when guest molecules, such as methane (CH4) or carbon dioxide (CO2), react with water at moderate-to-high pressures and low temperatures. There will be numerous phase transitions taking place involving mixed hydrates of CH4 and CO2. Fundamental knowledge of these phase transitions is essential to enable an accurate modeling of CO2 injection into CH4 hydrate reservoirs and to increase the understanding of the CH4/ CO2 exchange process
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