Abstract
Gas hydrate formation processes in porous media are always accompanied by water transfer. To study the transfer characteristics comprehensively, two kinds of layered media consisting of coarse sand and loess were used to form methane hydrate in them. An apparatus with three PF-meter sensors detecting water content and temperature changes in media during the formation processes was applied to study the water transfer characteristics. It was experimentally observed that the hydrate formation configurations in different layered media were similar; however, the water transfer characteristics and water conversion ratios were different.
Highlights
Clathrate hydrates, firstly identified by Sir Humphrey Davy in 1810 [1] are solid, non-stoichiometric compounds consisting of polyhedral water cavities and small gas molecules in the cavities [2], which have great potential as a premium source of natural gas, and have attracted the wide interest of many researchers and governments
According to the pressure and temperature changes, the water conversion ratios in two experiments were calculated and listed in Figure 2, which indicated that the amount of non-saturated coarse sand was helpful for the hydrate formation in the layered media
The results showed experimentally that in two different layered media, the hydrate formation configurations were similar: methane hydrate was formed only inside coarse sand
Summary
Firstly identified by Sir Humphrey Davy in 1810 [1] are solid, non-stoichiometric compounds consisting of polyhedral water cavities and small gas molecules in the cavities [2], which have great potential as a premium source of natural gas, and have attracted the wide interest of many researchers and governments. Geophysical and geological investigations have verified that large masses of natural gas hydrates exist in the sediments beneath permafrost regions and deep oceans. Gas hydrate formation and decomposition conditions can be seriously affected by the surrounding sediments. Knowledge about the thermodynamic mechanism(s) of formation and dissociation of hydrates in porous media is significant for research on gas hydrate storage and exploitation [4]. Many researchers have done much work based on this knowledge [5,6,7,8]
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