Pure tetrahydrofuran hydrate and tetrahydrofuran hydrate deposits with different materials as the skeleton are synthesized in our laboratory. A series of experiments are carried out to study the mechanical properties. The stress-strain curve, strength of pure tetrahydrofuran hydrate and hydrate deposit are obtained. Some phenomenon is explained.
Natural gas hydrate, or clathrate hydrate, a crystalline solid composed of natural gas and hydrogen bonded water molecules, is formed at relatively high pressure and low temperature conditions. Natural gas hydrate is extensively distributed in oceans, continental margins and some lakes. Because of the large volumes trapped in shallow sediments, natural gas hydrate is a potential source of energy, submarine geologic hazards and a factor in global climate change (Winters et al., 2007; Kvenvolden, 1988; briaud and Chaouch, 1997; Chaouch and briaud, 1997). Properties of the porous host sediment affect the morphology and extent of hydrate growth, which in turn alters the host sediment properties (Lee and Collett, 2001). In recent years, gas hydrate has become of great interest to the scientific community for the following reasons (Clayton, 2005):
It is conservatively estimated that more than 50% of the 18.8 Tt (terratonnes) of organic carbon presented on the earth is in the form of gas hydrate, found either in marine sediments or in permafrost, both being porous media. Extraction of methane from hydrates could provide a future energy resource.
Methane is a greenhouse gases 20 times potent than carbon dioxide. The volume of methane currently bound in hydrate is thought to be many thousand times that held in the atmosphere. Loss of stability in seafloor hydrate could lead to significant global warming, sea-level rise, and global climate destability.
There is some evidence to suggest that dissociation of gas hydrate can be a trigger for long run-out submarine landslides