The simulate experiments of gas production from methane hydrates reservoirs was proceeded with an experimental apparatus. Especially, TDR technique was applied to represent the change of hydrate saturation in real time during gas hydrate formation and dissociation. In this paper, we discussed and explained material transformation during hydrate formation and dissociation. The hydrates form and grow on the top of the sediments where the sediments and gas connect firstly. During hydrates dissociation by depressurization, the temperatures and hydrate saturation presented variously in different locations of sediments, which shows that hydrates dissociate earlier on the surface and outer layer of the sediments than those of in inner. The regulation of hydrates dissociation is consistent with the law of decomposition kinetics. Furthermore, we investigated the depressurizing range influence on hydrate dissociation process.
Depressurization method is a more potential way for gas production from gas hydrates. The behavior of gas hydrates dissociation by depressurization method is observed by the use of an experimental apparatus. The hydrates saturation is tracked by TDR during hydrates decomposition. The decomposition process consist three stages: fast dissociation, stable dissociation and the end. Significantly one of major factors that determine gas production rate by depressurization: degree of depressurization is discussed. t1/2 is used to characterize the hydrates decomposition rate. The greater of degree of depressurization is the faster of the hydrates decomposition rate gets.
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