Geological Engineering: Proceedings of the 1st International Conference (ICGE 2007)
20 Experimental Study and Kinetics Model of Gas Hydrate Dissociation
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The natural gas hydrates are ice-like crystalline compounds that contained in the sea bottom and the continental permanent belt. As huge reserves it is possible to become one of the most important energy sources in the future. The aim of hydrate production is to shift the thermodynamic equilibrium in a three-phase system (water—hydrate—gas) and release hydrocarbon gas from the decomposing hydrate. Thus the properties of hydrate dissociation at different physical conditions have important impact on the hydrate production. In the paper dissociation experiments were conducted on laboratory to synthesis hydrate at constant temperature and dissociation kinetics equation of the hydrate particles were established with the gas-solid reaction kinetics principle. From the experimental result and kinetics equation in different temperature and diffusion coefficient to the speed of dissociation we could find that: When the hydrate dissociation is under 60□, the high temperature can effectively speed up the dissociation rate. In the same reservoir temperature the increase of the diffusion coefficient also can enhance dissociation rate. Temperature and diffusion coefficient influence law to hydrate dissociation is concluded which provides a theoretical basis to the hydrate reservoir production.